Abscisic acid physiological effects

Salt, S.D., Tuzun, S. Kuc, J. (1986). Effects of jS-ionone and abscisic acid on the growth and resistance to blue mold. Mimicry of effects of stem infection by Peronospora tabacina Adam. Physiological and Molecular Plant Pathology, 28, 287-97. 

Roles of Metabolites of Abscisic Acid. Nothing is known about the physiological role of PA and DPA in plants, although these two metabolites of ABA have been tested in several bioassays recently. In the cotton explant abscission assay PA had one-tenth of the activity of ABA (19). PA and DPA were equally effective in inhibiting a-amylase secretion by barley aleurone layers treated with glbberellin A3 DPA had approximately one-tenth of the activity of ABA in this system (74). The effect of PA on growth of bean embryos was negligible (75). 

The three experiments with brassinolide showed that the physiological effect of brassinolide seems to be that of both an auxin and cytokinin. The twining growth effect, however, is the characteristic response evoked by brassi-nosteroids, and it was thought that the twining movement of the tendril and the twiner (climber) reported for auxin, or abscisic acid (ABA), or ethylene earlier is doubtful. In other words, brassinolide as a steroid may act on membrane systems. 

The sesquiterpene abscisic acid is also derived from isopentenyl pyrophosphate. Abscisic acid counteracts the effects of most other plant hormones. That is, it inhibits germination, growth, budding, and leaf senescence. Physiological evidence suggests a role for abscisic acid in ion and water balance. 

Sci Rep Tohoku Univ Foruth Ser Biol 27 199-207 Wada S, Nagao M (1960) Effect of guaiacol on the auxin-induced growth of rice coleoptile sections. Sci Rep Tohoku Univ Fourth Ser Biol 26 181-188 Walton DC (1980) Biochemistry and physiology of abscisic acid. Annu Rev Plant Physiol 31 453-489... 

Michniewicz M, Lang A (1962) Effect of nine different gibberellins on stem elongation and flower formation in cold requiring and photoperiodic plants grown under non-inductive conditions. Planta (Berl) 58 549-563 Milborrow BV (1974) The chemistry and physiology of abscisic acid. Annu Rev Plant Physiol 25 259-307... 

Hoad GV (1978) Effect of water stress on abscisic acid levels in white lupin Lupinus alba L.) fruit, leaves, and phloem exudate. Planta (Berl) 142 387-390 Hsiao TC (1973) Plant responses to water stress. Annu Rev Plant Physiol 24 519-570 Jones RL (1973) Gibberellins Their physiological role. Annu Rev Plant Physiol 24 571-598... 

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