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Role genu ABA1 ve fotomorfogenezi rostlin
Malysheva, Yuliia
Plant hormones belong to the group of growth regulators that play an irreplaceable role in plant growth and development. One of them is abscisic acid (ABA) that func-tions in many developmental processes, including stress responses or skotomorphogenesis. Zeaxanthin epoxidase (ABA1) plays an important role in the ABA biosynthesis and is required for the resistance to osmotic and drought stresses, ABA-dependent stomatal closure, seed dormancy and disease resistance. How-ever, the role of ABA1 in photomorphogenesis remains unclear. The base of this work was a selection of homozygous aba1-1 mutant in the Col-0 genetic background that was characterized under dark, low light and standard light conditions. The aba1-3 mutants in Ler-0 displayed reduced hypocotyl growth during late skotomorphogenic growth whereas reduction of hypocotyl length after exogenous application of cytokinin absent-ed compared to wild-type. In contrast, only small differences in hypocotyl growth were found between wild-type seedlings and ABA-deficient mutants during photomorpho-genesis. Interestingly, the treatment by exogenous cytokinin led to longer hypocotyls of aba1-3 mutant compared to wild-type. Analysis of the interaction of ABA and cytokinins revealed that cytokinins could revert some negative effects of ABA tre-atment like germination. It was shown that ABA and cytokinins orchestrate together the regulation of the growth and development of the seedlings.

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2 Malysheva, Yuliya
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