Biological Nitrogen Fixation for the 21st Century

Biological Nitrogen Fixation for the 21st Century

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The refinement of molecular techniques and the development of new probes of the phylogeny of diazotrophs has revealed an extreme biodiversity among the nitrogen fixers, which helps explain the role that nitrogen fixation plays in maintaining life on Earth. The most efficient ecosystems are those where the bacteria are associated with a plant in differentiated organs to benefit crop productivity. Most short-term benefit from fundamental research on nitrogen fixation is likely to result in the improvement of existing nitrogen-fixing symbiotic or associative systems. Longer-term efforts are aimed at extending the nitrogen-fixing capacity to other organisms, including transfer of the genetic information for efficient nitrogen fixation into the plant genome and using current knowledge of microbe-plant interactions to extend symbiosis to cereals and, in particular, to rice. Related challenges in sustainable agriculture and forestry include the creation of new nitrogen-fixing associations. All of these approaches were discussed at the 11th International Congress on Nitrogen Fixation, Paris, France, July 20-25, 1997 and covered in the present proceedings volume.Improving biological nitrogen fixation (BNF) through plant breeding is a potential approach to increase seed nitrogen yield in faba bean. Previously two cycles of bidirectional recurrent phenotypic selection were conducted for a BNF index combining nodule number, nodule mass, acetylene reduction activity, and plant fresh weight (Sadiki, 1990). This research was conducted to determine responses to plant selection for BNF. Inbred lines were derived after 5 selfing generations fromanbsp;...

Title:Biological Nitrogen Fixation for the 21st Century
Author: Claudine Elmerich, Adam Kondorosi, William E. Newton
Publisher:Springer Science & Business Media - 1998

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