TRIOASNYSNPTOHRETSIOSF, MAEBTAABOLISM, AND As with the other hormones, the response to ABAdepends on its concentration within the tissue and on the sensitivity of the tissue to the hormone. The processes of biosynthesis, catabolism, compartmentation, and transport all contribute to the concentration of active hormone in the tis- sue at any given stage of development. The complete biosynthetic pathway of ABAwas elucidated with the aid opf ABA-deficient mutants blocked at specific steps in the pathway.
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