Symbiotic Nitrogen Fixation and Ammonium Nitrogen Assimilation in rrrbrb-, rrRbRb-, and RRrbrb-Pea Mutants

Symbiotic Nitrogen Fixation and Ammonium Nitrogen Assimilation in rrrbrb-, rrRbRb-, and... Wrinkled-seeded pea mutants (Pisum sativum L., genotypes rrrbrb-, rrRbRb-, and RRrbrb-) have seeds with reduced, but different, starch content and modified starch properties. Analysis of these mutants revealed an enhanced capacity of root nodules for symbiotic nitrogen fixation and of host plant organs for assimilation of ammonium nitrogen. This observation was confirmed by morphological data on organization of symbiotic system, by elevated nitrogenase activity, high protein accumulation in plants due to nitrogen fixation, and by enhanced activity of glutamine synthase in leaves and glutamate dehydrogenase in roots of mutants, as compared with the organs of wild-type pea. It is supposed that the aforementioned advantages of mutants are related to accumulation in seeds of elevated protein reserves that satisfy their demand for nitrogen during formation of symbiotic systems. http://www.deepdyve.com/assets/images/DeepDyve-Logo-lg.png Russian Journal of Plant Physiology Springer Journals

Symbiotic Nitrogen Fixation and Ammonium Nitrogen Assimilation in rrrbrb-, rrRbRb-, and RRrbrb-Pea Mutants

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Publisher
Springer Journals
Copyright
Copyright © 2003 by MAIK “Nauka/Interperiodica”
Subject
Life Sciences; Plant Sciences
ISSN
1021-4437
eISSN
1608-3407
D.O.I.
10.1023/A:1022993702551
Publisher site
See Article on Publisher Site

Abstract

Wrinkled-seeded pea mutants (Pisum sativum L., genotypes rrrbrb-, rrRbRb-, and RRrbrb-) have seeds with reduced, but different, starch content and modified starch properties. Analysis of these mutants revealed an enhanced capacity of root nodules for symbiotic nitrogen fixation and of host plant organs for assimilation of ammonium nitrogen. This observation was confirmed by morphological data on organization of symbiotic system, by elevated nitrogenase activity, high protein accumulation in plants due to nitrogen fixation, and by enhanced activity of glutamine synthase in leaves and glutamate dehydrogenase in roots of mutants, as compared with the organs of wild-type pea. It is supposed that the aforementioned advantages of mutants are related to accumulation in seeds of elevated protein reserves that satisfy their demand for nitrogen during formation of symbiotic systems.

Journal

Russian Journal of Plant PhysiologySpringer Journals

Published: Oct 17, 2004

References

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