Activity of Racemase and Appearance of N-Malonyl-D-Tryptophan during Osmotic Stress and Drought Conditions
D-Tryptophan (DTry) accumulating in wilted plant tissues and seeds may be used simultaneously in IAA biosynthesis and in the formation of N-malonyl-D-tryptophan (MDTry). MDTry synthesis may be considered as a drought inducible step in the regulation of IAA biosynthesis; MDTry synthesis results in a temporary reserve for the inactivated precursor when cells lose water. The stereochemical compartmentation of the indole precursor in the form of DTry or MDTry offers the possibility to use Try only for the IAA biosynthesis but not for the synthesis of proteins.
KeywordsOsmotic Stress Temporary Reserve
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