THE EFFECTS OF MUTATION-INDUCED CHLOROPHYLL DEFICIENCY AND LIGHT ON PHYTOHORMONES IN PEA-PLANTS

The effects of light and mutation-induced chlorophyll deficiency on th e content and shoot-to-root ratio of ABA, IAA, and cytokinins were stu died in 8-day-old seedlings of pea (Pisum sativum L.) mutant (xantha). Under illumination, photomorphogenetic responses, namely, stem elonga tion, plumular look opening, and growth and expansion of the leaves, w ere similar in the mutant and wild-type green plants. The content and shoot-to-root ratio of the phytohormones depended upon the light condi tions during growth. Mutation-induced chlorophyll deficiency did not a ffect the level and distribution of either the IAA or the cytokinins, but sharply decreased the ABA content.