Phytohormone levels in different types of symbiotic mutants of pea

The levels of the phytohormones auxin and gibberellin were studied in the o riginal pea (Pisum sativum L.) cultivars. Rondo and Ramonskii 77 and in dif ferent types of symbiotic mutants (non-nodulating, with single nodules, and supernodulating) induced from them. The results obtained indicated that th e levels of the phytohormones in the symbiotic mutants depend on the plant' s genotype, developmental phase, and infection with rhizobia. Two mutants w ere isolated whose phytohormonal status markedly differed from the original forms. These mutants may be used for identification of the genes that dete rmine the auxin and gibberellin statuses.