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37 produkter
37 produkter
Del 25 - Advances in Agricultural Biotechnology
Flax: Breeding and Utilisation
Inbunden, Engelska, 1988
2 117 kr
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Proceedings of the EEC Flax Workshop, held in Brussels, Belgium, May 4-5, 1988 sponsored by the Commission of the European Communities, Directorate-General for Agriculture.
Del 26 - Advances in Agricultural Biotechnology
Biochemical and Physiological Aspects of Ethylene Production in Lower and Higher Plants
Proceedings of a Conference held at the Limburgs Universitair Centrum, Diepenbeek, Belgium, 22–27 August 1988
Inbunden, Engelska, 1989
2 117 kr
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With the demonstration of the "triple response" in plants by Neljubow at the turn of the century, ethylene has been identified as a substance specifically affecting plant growth. Yet it took a few more decades to show that ethylene is a naturally occurring product of plants having all the characteristics of a phytohormone. Ever since much effort has been devoted to a wide variety of physiological and biochemical problems relevant to ethylene. A first meeting was organized in Israel in 1984 to bring together many people active in this rapidly expanding field of experimental research. It is the aim of the present symposium to provide once more a forum at which researchers might expose and comment progress in their work over the last few years. Speakers were invi ted and their contri buti ons ordered ina number of sessions, each of which was centered on a particular topiC. Much of the benefit came from ensuing discussion sessions which were conducted with much competence and expertise by Anderson, Ben-Arie, Goren, Morgan and Osborne. All of these colleagues are recognized leaders in ethylene research today and the organizers owe a very special gratitude to them for their substantial contribution to the programme. It is well to remember the friendly atmosphere, so essential to the success of the whole meeting and so much enjoyed by every partiCipant. Prompt publi ca tion of the papers was made possi ble by the camera-ready procedure offered by the publisher.
Advances in Nitrogen Fixation Research
Proceedings of the 5th International Symposium on Nitrogen Fixation, Noordwijkerhout, The Netherlands, August 28 – September 3, 1983
Inbunden, Engelska, 1983
534 kr
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As for the preceding four International Symposia on Nitrogen Fixation, held in Pullman, Washington USA (1974); Salamanca, Spain (1976); Madison, Wisconsin, USA (1978); and Canberra, Australia (1980), the 5th Symposium held from August 28 - September 3, 1983 in Noordwijkerhout, The Netherlands, received the gene rous support of the Charles F. Kettering Foundation Research Laboratory and the Tennessee Valley Authority. This support has helped research progress in this broad field of science by offering a forum both for the exchange of ideas and for scientific summary and discussion as captured over the last 10 years in each of the four books published previously. Although all previous meetings were well attended, the present conference was the largest so far. 550 scien tists from 60 different countries attended the "Leeuwenhorst Conference", re presenting the many different disciplines actively involved in research in this field: chemists, biochemists, molecular biologists, geneticists, microbiologists, plant physiologists, agriculturalists. A large number of them had to go through a difficult period to raise the necessary funds to attend. In addition, a parallel meeting of "policymakers" from Southeast Asia, Africa and South America was held under the auspices of Crosscurrents International Institute, Dayton, OR, USA and the United Nations University, Tokyo, Japan. These participants attended some of the scientific sessions to benefit from the vision of a number of scientists at the symposium.
1 589 kr
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There is a paucity of information on the dynamics of Ascorbic Acid (AA) turnover in relation to germination, metabolism, growth, differentiation and development of a plant and in those undergoing stress of various types. in presowing treatment of seeds etc. The turnover of AA plays an important role during the juvenile phase of growth of a plant and has a significant bearing on its subsequent growth, development and maturation. The beneficial effect of presowing treatment of seed with Ascorbic Acid (AA) + H2 O highlights the validity of the AA-nucleic acid 2 protein metabolism concept of growth and development of plan ts. During the course of the last 30 years, work has been undertaken by the author and his collaborators on the meta bolic drifts of regulatory substances during juvenile, vegetative, reproductive and senescent phases. The most important of these growth regulatory substances was found to be Ascorbic Acid. The dynamiC role of AA turnover is revealed by its control of rates of metabolic processes as well as those of enzymic reactions which paves the way to "New Genetics".
Del 2 - Advances in Agricultural Biotechnology
Advances in Photosynthesis Research
Proceedings of the VIth International Congress on Photosynthesis, Brussels, Belgium, August 1–6, 1983 Volume 2
Häftad, Engelska, 1984
534 kr
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Del 4 - Advances in Agricultural Biotechnology
Advances in Photosynthesis Research
Proceedings of the VIth International Congress on Photosynthesis, Brussels, Belgium, August 1–6, 1983. Volume 4
Häftad, Engelska, 1984
534 kr
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The Sixth International Congress on Photosynthesis took place from 1 to 6 August 1983, on the Campus of the "Vrije Universiteit Brussel", in Brussels, Belgium. These Proceedings contain most of the scientific contributions offered during the Congress. The Brussels Congress was the largest thus far held in the series of International Congresses on Photosynthesis. It counted over 1100 active participants. The organizers tried to minimize the disadvantages of such a large size by making maximum use of the facili ties available on a university campus. Most contributions were offered in the form of posters which were displayed in a substantial number of classrooms. The discussion sessions, twice a day, four or five in parallel, took place in lecture rooms in the very vicinity of these classrooms. In this way it was attempted to generate the atmosphere of a small meeting. The unity of the subject Photosynthesis was preserved in the ten plenary lectures, organ~sed in such a way that a general overview of two diverse topics was given every day. In addition, there were the five times four parallel symposia dealing with some six teen general topics. Every editor of proceedings of a congress is faced with the problem of editing and arranging the contributions, a problem compounded by the wide diversity and the large number of the 753 manuscripts.
Del 10 - Advances in Agricultural Biotechnology
Applications of Genetic Engineering to Crop Improvement
Inbunden, Engelska, 1984
1 062 kr
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The contributions of plant genetics to the production of higher yielding crops of superior quality are well documented. These successes have been realized through the application of plant breeding techniques to a diverse array of genetically controlled traits. Such highly effective breeding procedures will continue to be the primary method employed for the development of new crop cultivars; however, new techniques in cell and molecular biology will provide additional approaches for genetic modification. There has been considerable speculation recently concerning the potential impact of new techniques in cell and molecular biology on plant improvement. These genetic engineering techniques should offer unique opportunities to alter the genetic makeup of crops if applied to existing breeding procedures. Many questions must be answered in order to identify specific applications of these new technologies. This search for applications will require input from plant scientists working on various aspects of crop improvement. This volume is intended to assess the interrelationships between conventional plant breeding and genetic engineering.
2 433 kr
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A Seminar held in the Framework of the Biomolecular Engineering Programma of the Commission of the European Communities, at the Carlsberg Laboratory in Copenhagen, October 9-10, 1984
2 117 kr
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2 117 kr
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Plant hormone research is the favorite topic of physiologists. Past three decades have witnessed that this subject has received much attention. The inquisitive nature of human mind has pumped much in literature on this subject and this volume is the product of such minds. In the following pages various hormonal-controlled physiological processes like, flowering, seed dormancy and germination, enzyme secretion, senes cence, ion transport, fruit ripening, root growth and development, thig momorphogenesis and tendril thigmonasty have been included. The volume also contains a review paper on 'Growth Regulating Activity of Penicillin in Higher Plants' and has been presented for the first time. The vast contents of each review paper have been written by erudite scholars who have admirably carried out their evangelic task to make the text up TO date. This volume, I am sure, would stimulate the appetite of researchers of peripheral disciplines of botany and agricultural sciences and they will continue to enjoy the fun and adventures of plant hormone research. Save one. my most outstanding debts are due to the rich array of the contributors and other plant physiologists specially to Prof. Thomas Gaspar (Belgium), Prof. E. E. Goldschmidt (Isreal), Prof. H. Greppin (Switzerland), Dr. K. Gurumurti (India), Prof. M. A. Hall (U. K. ), Prof. H. Harada (Japan), Dr. M. Kaminek (Czechoslovakia), Dr. J. L. Karm oker (BangIa Desh), Prof. Peter B. Kaufman (U. S. A. ), Dr. V. I. Kefeli . / (U. S. S. R. ), Dr. M. Kutaoek (Czechoslovakia), Prof. S.
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Plant resistance to pathogens is one of the most important strategies of disease control. Knowledge of resistance mechanisms, and of how to exploit them, has made a significant contribution to agricultural productivity. However, the continuous evolution of new variants of pathogen, ana additional control problems posed by new crops and agricultural methods, creates a need for a corresponding increase in our understanding of resistance and ability to utilize it. The study of resistance mechanisms also has attractions from a purely academic point of view. First there is the breadth of the problem, which can be approached at the genetical, molecular, cellular, whole plant or population lev~ls. Often there is the possibility of productive exchange of ideas between different disciplines. Then there is the fact that despite recent advances, many of the mechanisms involved have still to be fully elucidated. Finally, and compared with workers in other areas of biology, the student of resistance is twice blessed in having as his subject the interaction of two or more organisms, with the intriguing problems of recognition, specificity and co-evolution which this raises.
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Del 19 - Advances in Agricultural Biotechnology
Biological Control of Photosynthesis
Proceedings of a conference held at the ‘Limburgs Universitair Centrum’, Diepenbeek, Belgium, 26–30 August 1985
Inbunden, Engelska, 1986
1 589 kr
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All measurements of intact leaf 02 sensitivity can be explained by the oxygenation model for glycolate formation and glycolate metabolism by established pathways. Predicting the rate of oxygenation from the underlying biochemistry is more reliable than calculating the rate of oxygenation from intact leaf gas exchange measurements. REFERENCES 1. Badger MR, TD Sharkey, S von Caemmerer: The relationship between steady-state gas exchange of bean leaves and the levels of carbon reduction cycle intermediates. Planta 160:305-313, 1984. 2. Bowes, G, WL Ogren, RH Hageman: Phosphoglycolate production catalyzed by ribulose diphosphate carboxylase. Biochem. Biophys. Res. Commun. 45:716-722, 1971. 3. Farquhar GD, S von Caemmerer, JA Berry: A biochemical model of photosynthetic C02 assimilation in leaves of C3 species. Planta 149: 78-90, 1980. 4. Farquhar GD, S von Caemmerer: Modelling of photosynthetic response to environmental conditions. In OL Lange, PS Nobel, CB Osmond, H Ziegler, eds, Encycl. of Plant Physiol., New Series, Springer- Verlag, Heidelberg 12b: 549-587, 1982. 5. Jordan DB, WL Ogren: The C02/02 specificity of ribulose 1- bisphosphate carboxylase/oxygenase.Dependence on ribulose bisphosphate concentration, pH and temperature. Planta 161: 308-313, 1984. 6. Ku SB, GE Edwards: Oxygen inhibition of photosynthesis. I. Temperature dependence and relation to 02/C02 solubility ratio. Plant Physiol 59: 986-990, 1977. 7. Laing WA, WL Ogren, RL Hageman: Regulation of soybean net photosynthetic C02 fixation by the interaction of C02' 02 and ribulose l,5-diphosphate carboxylase. Plant Physiol 54: 678-685, 1974.
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Proceedings of a Seminar in the CEC Programme of the Coordination of Research on Plant Protein Improvement, held in Gembloux, Belgium, Sept. 3-5, 1985
Del 21 - Advances in Agricultural Biotechnology
Hormonal Regulation of Plant Growth and Development
Inbunden, Engelska, 1986
1 589 kr
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The dynamic role of plant hormones in regulation of plant growth and development revealed by its control of rates of metabolic processes and various related enzymetic reactions at molecular and submolecular levels is now weil established. During the course of last 35 years endless development in agricultural biotechnology has provided immense literature to understand hormone-regulated aspects of plant growth and development ; but plant physiologists all over the world are still devoting themselves and will continue for an indifinite period to disclose the mystries of this regulation. Volume I of this series has already been published and has been accepted weil. This encouraged me to edit aseries of volumes (I do not know the number) on this subject. In the following pages various aspects of hormone-controlled physiological processes Iike, Hormonal Control of pro tein synthesis in plants, Auxin-induced elongation, Hormonal regulation of abnormal growth in plants, Hormonal regulation of development in mosses, Some phenolics as plant growth and morphogenesis regulators, Plant growth regulating properties of sterol inhibiting fungicides, Hormonal regulation of sex expression in plants, Water relation and plant growth regulators, Hormonal regulation of root development under water stress, Gravity perception and responses meehanism in graviresponding cereal grass shoots, Hormonal regulation of leaf Growth senescence in relation to stomatal movement, and Chloroindole auxins of pea and related species, have been included.
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Proceedings of a Seminar in the EEC Programme of Coordinated Research on Energy in Agriculture held in Freising-Weihenstephan, FRG, November 4-6, 1986
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Proceedings of a Seminar in the CEC Programme of the Coordination of Research on Plant Protein Improvement, held in Gembloux, Belgium, Sept. 3-5, 1985
Del 6 - Advances in Agricultural Biotechnology
Genetic Resources and Their Exploitation — Chickpeas, Faba beans and Lentils
Häftad, Engelska, 2011
534 kr
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Chickpeas, faba beans and lentils are important pulse crops in the Mediterranean regi on and Mi ddl e East, where thei r hi gh protei n seed nutritionally complement cereal grain in the human diet. The by-products of these crops serve as a valuable feed for animals. Thanks to their ability to fix atmospheric nitrogen, the inclusion of these crops in the cropping system helps in the maintenance of the productivity of the soil and reduces the dependence of the farmer on fertilizer nitrogen to realise good yields. Being the site of original domestication of these legumes, the Fertile Crescent is bel ieved to possess their vast genetic diversity. In order to prevent the erosion of this genetic di'/ersity and to preserve it for posterity, it is necessary that a major effort is made for its expeditious collection, evaluation, documentation and safe storage. The International Center for Agricultural Research in the Dry Areas (ICARDA) being located in the Fertile Crescent has, within its mandate, the responsibility to act as a world centre for the work on the genetic resources of kabuli chickpeas, faba beans and lentils. The International Board of Plant Genetic Resources (IBPGR) has been strongly supporting ICARDA in this important activity.
Del 8 - Advances in Agricultural Biotechnology
Protochlorophyllide Reduction and Greening
Häftad, Engelska, 2011
534 kr
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This book gathers contributions presented during an In- ternational meeting organized by the Laboratory of Photobio- logy of the University of Liege, Belgium, on 8 and 9 August 1983. The general topic of the discussions was protochlorophyl- lide reduction and greening. Among the reasons for choosing this topic were the recent advances in the field. These ad- vances deal with: (1) The characterization of the basic constituents of the photoenzymatic complex responsible for protochlorophylli- de reduction. This complex is known to be ternary, comprising the pigment: protochlorophyllide, NADPH and the enzyme proto- chlorophyllide oxidoreductase. (2) The discovery of short-lived intermediates in the photoreduction process, and in particular, the recent findings resulting from the proqresses of the picosecond and nanosecond spectrometry. (3) The obtention of new data on the components of the plastids, on the changes they undergo during the first steps of greening, and on the distribution of the pigment-protein complexes between the various substructures of the etioplast. (4) The detection of early photoactivities apart from protochlorophyllide reduction.These subjects have ~cen extensively discussed during the meeting and several sections of this book are devoted to the presentation of the new data.
Del 9 - Advances in Agricultural Biotechnology
Ethylene
Biochemical, Physiological and Applied Aspects, An International Symposium, Oiryat Anavim, Israel held January 9–12 1984
Häftad, Engelska, 2011
534 kr
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An International Symposium, Qiryat Anavim, Israel, January 9-12, 1984
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The contributions of plant genetics to the production of higher yielding crops of superior quality are well documented. These successes have been realized through the application of plant breeding techniques to a diverse array of genetically controlled traits. Such highly effective breeding procedures will continue to be the primary method employed for the development of new crop cultivars; however, new techniques in cell and molecular biology will provide additional approaches for genetic modification. There has been considerable speculation recently concerning the potential impact of new techniques in cell and molecular biology on plant improvement. These genetic engineering techniques should offer unique opportunities to alter the genetic makeup of crops if applied to existing breeding procedures. Many questions must be answered in order to identify specific applications of these new technologies. This search for applications will require input from plant scientists working on various aspects of crop improvement. This volume is intended to assess the interrelationships between conventional plant breeding and genetic engineering.
Systems for Cytogenetic Analysis in Vicia Faba L.
Proceedings of a Seminar in the EEC Programme of Coordination of Research on Plant Productivity, held at Wye College, 9–13 April 1984
Häftad, Engelska, 2011
534 kr
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Unlike the situation in the major cereals, the yields of Vicia faba have not been markedly increased during the last half century. There is no single cause for this but among those that have been important is the lack of cytogenetic understanding in relation to breeding performance. Since as a consequence, little genetic variation has been available to agronomists conclusions, probably unwarranted, have been drawn about the limited prospects for the faba bean. Against such a background it has been difficult to justify the investment of research resources in the crop. The central theme of this book is that with the establishment of cytogenetic studies in Vicia faba understanding of its genetic system will develop in relation to breeding improvement and thereafter some at least, of the impediments to yield increase can steadily though not dramatically, be removed. We have distinguished between longer and shorter papers and only the former include Abstracts. The latter amplify themes in the longer papers or were written to develop particular topics at the request of the editors. G.P. Chapman S.A. Tarawali Wye College, April, 1984 VIII ACKNOWLEDGEMENTS We would like to thank the various contributors to this publication for the readiness with which they have met our various req~ests. Our thanks are due to the staff of the Centre for European Agricultural Studies for facilitating arrangements for the Seminar and to Mr. Peter Abott and Carl Zeiss (Oberkochen) Ltd. for the display of microscopes.
534 kr
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Investigations on seed proteins have been intensively carried out during the past two decades. This is valid with regard to both their chemical composition as well as their nutritive value. The development of new biochemical and physical methods has resulted in obtaining deep insights into the structures of seed proteins and their mutual interactions. Intensive exchange of information between the scientists participating in national and international research programmes has given strong impulses for intensifying the research in this field. For the quantitative and quali tative investigations of seed proteins, not only some model plants were used; on the contrary, they were carried out on a large number of different crops important for different regions of the earth. In this way, a level of knowledge has been reached which could not be expected in this diversity within such a short period. This holds not only true for biochemical but also for physiological characters of the species of the limiting amino acids studied. With regard to nutritional aspects, the problem was of special interest, but also seed proteins acting as antinutritional factors were analysed in detail. Based on the knowledge of seed protein structures, it was possible to perform investigations on the genetic basis of their synthesis. This was done under two different aspects: The basic knowledge on the genes involved should be widened; moreover, it should be tried to improve the seed proteins quantitatively and qualitatively under the influence of mutant genes.
Effects of Stress on Photosynthesis
Proceedings of a conference held at the ‘Limburgs Universitair Centrum’ Diepenbeek, Belgium, 22–27 August 1982
Häftad, Engelska, 2011
534 kr
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This volume contains the papers, presented during a conference, organized jointly by the "Opzoekingsstation van Gorsem" and the "Limburgs Universitair Centrum", Belgium from 22 to 27 August 1982. For this third meeting, the chosen topic was the effect of different stresses on photosynthesis. Most of the research in this field is realized on water stress and temperature stress; this situation is refllected in the conference programme. However, the imp- tance of the other factors such as light, CO , salinity, anaerobiosis, was 2 also emphasized especially during the important discussion sessions. We express our gratitude to Drs. J. Gale, P. Jarvis, G.H. Krause, P.E. Kriedemann and P.S. Nobel for their excellent leadership during the discussion sessions. Particular thanks are also due to Dr. H.~i. Woolhouse who gave us an excellent inaugural address and whose erudition largely contributed to the interest of the discussions. For the first time in our experience of editors, we decided to use camera ready copies in order to publish more rapidly the proceedings and at a lower price. For a lot of reasons (among other things the bad choice of type of letter to be used and the choice of instructions to authors which were not perfectly followed by the authors), the technical presentation of this book will appear as non homogeneous; we accepted this lack of homogeneity with the hope tbat the publication time would be shorter in spite of the fact that, some authors delivered their manuscript with delay.
Del 1 - Advances in Agricultural Biotechnology
New Frontiers in Plant Biochemistry
Häftad, Engelska, 2014
534 kr
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A symposium entitled "The New Frontiers and Future Perspectives of Plant Bio chemistry" was held in Nagoya, Japan, September 1-3, 1981 in honor of Professor lkuzo Uritani. Recognizing his planned retirement from Nagoya University in March, 1982, the meeting was organized by Professor Uritani's Japanese colleagues and included a nurober of foreign scientists, many whom were his close friends. This volume is a compilation of the principal papers contributed for the occasion and is dedicated to Professor Uritani as an expression of the high esteem in which he is held for his outstanding achievements in the field of plant biochemistry and plant disease physiology, as well as to convey our warm personal affection and friendship. The subjects covered in the volume are diverse, reflecting the honoree's broad research interests, but at the same time articles written by experts in each field pro vide a clear picture of the current frontiers and perspectives of plant biochernistry research. The continuing development of new experimental strategies has spurred rapid and broad research advances in this field of science, and the many interesting concepts now at hand hold promise of further unique progress in the years ahead. lt is hoped that this volume will serve as a stimulating text for scientists in this field.
Advances in Nitrogen Fixation Research
Proceedings of the 5th International Symposium on Nitrogen Fixation, Noordwijkerhout, The Netherlands, August 28 – September 3, 1983
Häftad, Engelska, 2011
534 kr
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As for the preceding four International Symposia on Nitrogen Fixation, held in Pullman, Washington USA (1974); Salamanca, Spain (1976); Madison, Wisconsin, USA (1978); and Canberra, Australia (1980), the 5th Symposium held from August 28 - September 3, 1983 in Noordwijkerhout, The Netherlands, received the gene rous support of the Charles F. Kettering Foundation Research Laboratory and the Tennessee Valley Authority. This support has helped research progress in this broad field of science by offering a forum both for the exchange of ideas and for scientific summary and discussion as captured over the last 10 years in each of the four books published previously. Although all previous meetings were well attended, the present conference was the largest so far. 550 scien tists from 60 different countries attended the "Leeuwenhorst Conference", re presenting the many different disciplines actively involved in research in this field: chemists, biochemists, molecular biologists, geneticists, microbiologists, plant physiologists, agriculturalists. A large number of them had to go through a difficult period to raise the necessary funds to attend. In addition, a parallel meeting of "policymakers" from Southeast Asia, Africa and South America was held under the auspices of Crosscurrents International Institute, Dayton, OR, USA and the United Nations University, Tokyo, Japan. These participants attended some of the scientific sessions to benefit from the vision of a number of scientists at the symposium.
1 589 kr
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There is a paucity of information on the dynamics of Ascorbic Acid (AA) turnover in relation to germination, metabolism, growth, differentiation and development of a plant and in those undergoing stress of various types. in presowing treatment of seeds etc. The turnover of AA plays an important role during the juvenile phase of growth of a plant and has a significant bearing on its subsequent growth, development and maturation. The beneficial effect of presowing treatment of seed with Ascorbic Acid (AA) + H2 O highlights the validity of the AA-nucleic acid 2 protein metabolism concept of growth and development of plan ts. During the course of the last 30 years, work has been undertaken by the author and his collaborators on the meta bolic drifts of regulatory substances during juvenile, vegetative, reproductive and senescent phases. The most important of these growth regulatory substances was found to be Ascorbic Acid. The dynamiC role of AA turnover is revealed by its control of rates of metabolic processes as well as those of enzymic reactions which paves the way to "New Genetics".
534 kr
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China was the first country to use cytoplasmic male sterility to develop hybrid rice for commercial use in 1973. In 1986 more than 8 million hectares of hybrid rice were planted in China, which is one fourth of the total rice area and produces one third of the total rice in the country. Hybrids usually out yield the leading commercial varieties by -20-30%, giving an average yield advantage of 1 to 1. 5 t/ha, because of their better morphological traits, higher physiological efficiency, better resistance to major diseases and insects, and wide adaptability to various agro-ecological stresses. IMPROVEMENT OF HYBRID RICE A. Mutation techniques Almost all of the cultivated F1 rice hybrids in China are developed from cytoplasmic male sterile and restorer lines. According to surveys made in recent years, more than 30 sources of cytoplasmic male sterility in rice can be identified, among which only six are being commercially used (Table 1). Wild rice with aborted pollen (WA) cytosterility system is the most popular one in use to develop male sterile lines (MS line) in China. The main technique available for developing stable MS lines is sUbstitution backcrossing of the genome of one species into alien cytoplasm of another. Sufficient backcrosses are required to eliminate all nuclear genes derived from the cytoplasm donor species. A number of studies have shown that using interspecies crosses, such as the cross of wild rice (Q. perennis, Q. sativa, f.
Biochemical and Physiological Aspects of Ethylene Production in Lower and Higher Plants
Proceedings of a Conference held at the Limburgs Universitair Centrum, Diepenbeek, Belgium, 22–27 August 1988
Häftad, Engelska, 2011
2 117 kr
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With the demonstration of the "triple response" in plants by Neljubow at the turn of the century, ethylene has been identified as a substance specifically affecting plant growth. Yet it took a few more decades to show that ethylene is a naturally occurring product of plants having all the characteristics of a phytohormone. Ever since much effort has been devoted to a wide variety of physiological and biochemical problems relevant to ethylene. A first meeting was organized in Israel in 1984 to bring together many people active in this rapidly expanding field of experimental research. It is the aim of the present symposium to provide once more a forum at which researchers might expose and comment progress in their work over the last few years. Speakers were invi ted and their contri buti ons ordered ina number of sessions, each of which was centered on a particular topiC. Much of the benefit came from ensuing discussion sessions which were conducted with much competence and expertise by Anderson, Ben-Arie, Goren, Morgan and Osborne. All of these colleagues are recognized leaders in ethylene research today and the organizers owe a very special gratitude to them for their substantial contribution to the programme. It is well to remember the friendly atmosphere, so essential to the success of the whole meeting and so much enjoyed by every partiCipant. Prompt publi ca tion of the papers was made possi ble by the camera-ready procedure offered by the publisher.
534 kr
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Rhizobium species involved in root nodule formation on legume plants are one of the best known groups of micro organisms. The Rhizobium legume symbiosis continues to be of strategic importance particularly in the context of food production. As the world population grows, it is also neces sary to have new developments taking place in crop improve ment. The development and application of new technologies in biological sciences over the past number of years have made the entire area of plant-microbial interaction an exciting and challenging research area to be involved in. In view of the importance of symbiotic nitrogen fixation, it is not surpris ing that it still represents one of the priority areas for commercial development in agricultural biotechnology. Since this symbiosis involves an association between procaryotic and eucaryotic partners, it requires of necessity a co-ordinated and interdisciplinary approach. It was in this spirit that this international conference was organised. The scientific programme was designed to focus on physio logical limitations affecting symbiotic nitrogen fixation and the potential for overcoming such limitations using genetic technologies. Participants were drawn from contractants of the EEC DGVI "Energy in Agriculture" nitrogen fixation prog ramme. The scientific programme was also supplemented with invited scientists from Europe and North America to provide appropriate expertise on the various conference topics.