Provorov, N.A. (2013) Improvement of symbiotic nitrogen fixation in plants: molecular-genetic approaches and evolutionary models. Russian Journal of Plant Physiology, 60 (1). pp. 27-32.
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Abstract
Efficiency of symbiotic nitrogen fixation in legumes depends on bringing together the processes of N2 fixation, assimilation of its products, supply of nitrogenase with energy, and development of nodule tissue and cellular structures. Coordination of these processes could arise from the evolutionary old functions of the nodules associated with deposition of the products of photosynthesis governed by systemic signals traveling between the above-ground organs and the roots. Further increase in symbiotic efficiency was associated with a pronounced ability to fix N2 by intracellular bacteroids that lost capability to propagate (as observed in galegoid legumes from the tribes Viciae, Trifolieae, and Galegae producing indeterminate nodules). However, efficiency of these symbioses is restricted by a slow removal from the nodules of the products of N2 fixation, which are assimilated along the same amide pathway as nitrogen compounds arriving from the soil. In legumes from the tribe Phaseoleae, such a restriction was overcome owing to a particular way of nitrogen assimilation via its incorporation into ureides (in determinate nodules). Development of symbioses where specialization of bacteroids in symbiotic fixation of atmospheric nitrogen is combined with its ureide assimilation will make it possible to produce new forms of plants highly efficient in symbiotic nitrogen fixation.
| Item Type: | Article |
|---|---|
| Additional Information: | This work was supported by the Russian Founda� tion for Basic Research, project no. 12�04�00409a, Presidential Foundation (grant no. NSh�337.2012.4), and State Contract of the Ministry of Education and Science of the Russian Federation (project nos. 16.552.11.7085; 8056). |
| Uncontrolled Keywords: | legumes, nodule bacteria (rhizobia), symbiotrophic, autotrophic, and mixotrophic nitrogen assimilation, systemic regulation of nodule development, evolution of nitrogen fixing systems, genetic engineering of plant-microbial symbioses, |
| Author Affiliation: | All-Russian Research Institute of Agricultural Microbiology, Russian Academy of Agricultural Sciences, sh. Podbel’skogo 3, Pushkin-8, St. Petersburg, 196608, Russia |
| Subjects: | Plant Physiology and Biochemistry > Plant Physiology |
| Divisions: | General |
| Depositing User: | Mr Siva Shankar |
| Date Deposited: | 26 Sep 2013 11:02 |
| Last Modified: | 26 Sep 2013 11:02 |
| Official URL: | http:dx.doi.org/10.1134/S1021443713010056 |
| URI: | http://eprints.icrisat.ac.in/id/eprint/11868 |
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