Abstract
Abstract A set of 21 pea (Pisum sativum L.) non‐nodulating mutants and a supernodulating mutant were compared to the parental cv. ‘Finale’ by leaf nitrate reductase activity, nitrogen (N) content in the shoot, content of photosynthetic pigments, and growth. The plants were cultivated asymbiotically at the growth‐saturating nitrate (NO3) level (10 mM) to detect the nitrate assimilation faults. Both positive and negative deviations were revealed in all traits, indicating pleiotropy of symbiotic mutations and/or the deleterious effects of multiple mutations. Only four mutants were indistinguishable from the control plants by all traits. The supernodulating line RisfixC demonstrated lower shoot growth and increased N content in the shoot, in spite of the asymbiotic cultivation.
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