From epoxycarotenoids to ABA: the role of ABA 8'-hydroxylases in drought-stressed maize roots.

ABSTRACT: The ability of plants to withstand drought, a potentially major constraint to yield and production, is influenced by abscisic acid (ABA). ABA is synthesized in the cytosol from plastid carotenoid pathway derived precursors, and later inactivated by the action of ABA hydroxylases. Endogenous accumulation of ABA is controlled by both its synthesis and catabolism. Enzymatic activity of ABA 8'-hydroxylase (ABA8Ox), also referred to as CYP707A, is considered one of the key steps in modulating ABA levels that control numerous physiological processes. To investigate the role of this enzyme, maize ABA8Ox gene family members were identified. ABA8Ox gene expression was then analyzed in different tissues and roots during the drought-stress response in maize. These genes were found to be expressed in

SUBMITTER: Vallabhaneni R 

PROVIDER: S-EPMC2957537 | biostudies-literature | 2010 Dec

REPOSITORIES: biostudies-literature