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.
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