What is ABA catabolism?

What is ABA catabolism?

ABA catabolism is also a mechanism for regulating ABA levels. The expression of all four Arabidopsis CYP707A genes was induced by dehydration stress and subsequent rehydration [15,19], which indicates that ABA levels are regulated by a balance between biosynthesis and catabolism, including feedback-induced catabolism.

What is ABA biosynthesis?

The pathway of biosynthesis of abscisic acid (ABA) can be considered to comprise three stages: (i) early reactions in which small phosphorylated intermediates are assembled as precursors of (ii) intermediate reactions which begin with the formation of the uncyclized C40 carotenoid phytoene and end with the cleavage of …

What is abscisic acid synthesized from?

Abscisic acid (ABA) is an isoprenoid plant hormone, which is synthesized in the plastidal 2-C-methyl-D-erythritol-4-phosphate (MEP) pathway; unlike the structurally related sesquiterpenes, which are formed from the mevalonic acid-derived precursor farnesyl diphosphate (FDP), the C15 backbone of ABA is formed after …

What is meaning of abscisic acid?

: a plant hormone C15H20O4 that is a sesquiterpene widespread in nature and that typically promotes leaf abscission and dormancy and has an inhibitory effect on cell elongation.

Is abscisic acid anti gibberellin?

Abscisic acid (ABA) and gibberellins (GA) are one pair of classic phytohormones, which antagonistically mediate several plant developmental processes, including seed maturation, seed dormancy and germination, primary root growth, and flowering time control (Wang et al., 2013; Luo et al., 2014; Yang et al., 2014; Shu et …

What is the main function of ABA?

The plant hormone abscisic acid (ABA) functions as a chemical signal in response to environmental stresses. Stress signals are converted to ABA and this triggers the activation of a number of plant physiological and developmental processes, thereby inducing adaptation to the stress conditions [1,2,3].

Why is abscisic acid is called stress hormone?

Abscisic acid stimulates the closure of stomata in the epidermis and increases the tolerance of plants to various kinds of stresses. So, it is called the stress hormone.

Why is ABA called an Antitranspirant?

ABA can cause efflux of K+ ions from the guard cells and result in closure of stomata. So, it is known as an anti-transpirant.