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Tryptophan Decarboxylase Activity in Developing Cucumber Seedlings
Author(s) -
ELKINAWY MAHASEN,
RAA JAN
Publication year - 1974
Publication title -
physiologia plantarum
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 1.351
H-Index - 146
eISSN - 1399-3054
pISSN - 0031-9317
DOI - 10.1111/j.1399-3054.1974.tb05013.x
Subject(s) - hypocotyl , tryptophan , decarboxylation , enzyme , enzyme assay , biology , botany , aromatic l amino acid decarboxylase , specific activity , chemistry , biochemistry , amino acid , catalysis
The rate of decarboxylation of DL‐tryptophan‐carboxyl‐ 14 C in homogenates of cotyledons, hypocotyls and roots of sterile and non‐sterile cucumber seedlings of 4, 8 and 11 days was measured. Tryptophan decarboxylating activity is highest in hypocotyls, lowest in cotyledons. In all organs the activity decreases with age. This enzyme activity does not parallel the IAA level in the organs during ageing.