Abscisic Acid Biosynthesis and Metabolism

摘要: One of the questions which plant physiologists ask about a hormone is how its cellular levels are regulated. The concentration hormone, or any other constituent, will depend on rate synthesis and metabolism import into export from cell. Abscisic acid (ABA, Fig. 1) particularly interesting with regard to regulation levels, since they rise fall dramatically in several kinds tissues response environmental developmental changes. When leaves mesophytic plants water stressed, ABA can 10-to 50-fold within 4 8 hours, apparently due greatly increased biosynthesis. rewatered, drop pre-stress hours. reduced biosynthetic rate, vigorous possibly leaves. In developing seeds various plants, hundred-fold few days then decline low as mature dessicate. Synthesis metabolism, well import, involved changing levels. Dormant buds woody accumulate high decrease when exposed temperatures. A combination synthesis, probably determining these issues.