[PDF] The Quest For Nitrogen Fixation In Rice eBook

Author : Jagdish Kumar Ladha
Publisher : Int. Rice Res. Inst.
Page : 366 pages
File Size : 30,94 MB
Release : 2000
Category : Bacteria, Nitrifying
ISBN : 9712201120

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This book features the latest research advances made in developing nitrogen-fixing rice.

Author : J.K. Ladha
Publisher : Int. Rice Res. Inst.
Page : 226 pages
File Size : 29,50 MB
Release : 1997-10-31
Category : Nature
ISBN : 0792345142

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Proceedings of the Second Working Group Meeting of the Frontier Project on Nitrogen Fixation in Rice held in Faisalabad, Pakistan, 13-15 October 1996

Author : Mustafizur Rahman
Publisher : Springer Science & Business Media
Page : 244 pages
File Size : 45,11 MB
Release : 2013-04-09
Category : Science
ISBN : 9401586705

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Biological nitrogen fixation (BNF) has become important in rice farming systems because this process diminishes the need for expensive chemical fertilizers which have been associated with numerous health and environmental problems. The extensive exploitation of BNF would provide economic benefits to small farmers, avoiding all malign influences of chemical fertilizers. Meanwhile, advances in biotechnology have brought rice genetics to the threshold of new opportunities for increasing rice production. This volume focuses, in six different sessions, on the role of BNF in the improvement of rice production in the light of the current state of the art of BNF technology transfer and diffusion. New ideas on BNF technology in research, extension information and inoculant technology are also included, together with the socio-economic impacts of using BNF in rice farm systems.

Author : Jagdish Kumar Ladha
Publisher :
Page : 221 pages
File Size : 50,84 MB
Release : 1997
Category : Nitrogen
ISBN : 9780792347477

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This text looks at the advances in understanding symbiotic Rhizobium-legume interactions at the molecular level, the discovery of endophytic interactions of nitrogen-fixing organisms with non-legumes and the ability to introduce new genes into rice through transformation. This has created an opportunity to investigate the possibilities for incorporating N2 fixation capability in rice. During a think-tank workshop organized by IRRI in 1992, the participants reaffirmed that such opportunities do exist for cereals and recommended that rice be used as a model system. Subsequently, IRRI developed a New Frontier Project to co-ordinate the worldwide collaborative efforts among research centers committed to reducing dependency of rice on mineral N resources. An international Rice Biological Nitrogen Fixation (BNF) working group was established to review, share research results/materials, and to catalyze research.

Author : Gurdev S. Khush
Publisher : Int. Rice Res. Inst.
Page : 143 pages
File Size : 43,57 MB
Release : 1992
Category : Micro-organisms, Nitrogen-fixing
ISBN : 9712200353

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Rhizobium-legume interactions. Genesis of root nodules and the of host genes. Developmental aspects of the rhizobium-legume symbiosis. Host genetics of the nodulation phenotype. Hormones and nodule formation: cytokinin induction of the Sesbania rostrata early nodulin Enod2. Regul?ation of nodulation genes. Oligosaccharins - oligosaccharides with regulatory functions. The lipo-oligosaccharidic nodulation signals of Rhizobium meliloti. Role of exopolysaccharides in nodulation. Bacterial entry into roots. Nonlegume N2-fixing asociations. Symbiosis with frankia. Exploring new soil bacteria. Rhizobium nodulation of nonlegumes. Nodulation genes and biosynthesis of inodule acetic acid (IAA) in Azospirillum brasilense. Ammonium excretion by NilflL mutants of Azotobacter vinelandii. Genetics of associative nitrogen fixation in wheat. Potential for development of novel N2-fixing associations. Potential andlimitations of developing new plant-microbe interactions. Application of present knowledge on rhizobial host specificity to obtain efficientnodulation and nitrogen fixation of rice. Genetic transformation of rice and molecular basic of agroinfection. Nitrogen fixation in para-nodulated wheat. Invasion of nonlegume plants by diazotrophic bacteria. Development of nodulelike structure on rice roots.

Author : J.K. Ladha
Publisher : Springer
Page : 0 pages
File Size : 27,62 MB
Release : 2013-01-14
Category : Science
ISBN : 9789401157445

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During the next 30 years, farmers must produce 70% more rice than the 550 millions tons produced today to feed the increasing population. Nitrogen (N) is the nutrient that most frequently limits rice production. At current levels ofN use efficiency, we will require at least double the 10 million tons of N fertilizer that are currently used each year for rice production. Global agriculture now relies heavily on N fertilizers derived from petroleum, which, in turn, is vulnerable to political and economic fluctuations in the oil markets. N fertilizers, therefore, are expensive inputs, costing agriculture more than US$45 billion annually. Rice suffers from a mismatch of its N demand and N supplied as fertilizer, resulting in a 50-70% loss of applied N fertilizer. Two basic approaches may be used to solve this problem One is to regulate the timing ofN application based on needs of the plants, thus partly increasing the efficiency of the plants' use of applied N. The other is to increase the ability of the rice system to fix its own N. The latter approach is a long-term strategy, but it would have enormous environmental benefits while helping resource-poor farmers. Furthermore, farmers more easily adopt a genotype or variety with useful traits than they do crop and soil management practices that may be associated with additional costs.