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Levels of Indol‐3yl‐acetic acid (IAA), IAA‐oxidase and Peroxidase in Developing Cucumber Seedlings
Author(s) -
ELKINAWY MAHASEN,
RAA JAN
Publication year - 1973
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.1399-3054.1973.tb03101.x
Subject(s) - hypocotyl , oxidase test , peroxidase , auxin , germination , chemistry , biochemistry , indole 3 acetic acid , cotyledon , botany , enzyme , biology , gene
The level of indol‐3yl‐acetic acid (IAA) in the cotyledons of cucumber seedlings increases in the period 4 to 11 days after germination. In hypocotyls and roots the IAA level decreases. IAA‐oxidase activity of homogenates of cotyledons, hypocotyls and roots decreases with age. The soluble fraction of all three organs contains an IAA‐oxidase, which may be allosteric. It is suggested that this IAA oxidase limits the upper level of IAA in the cell. The cell wall fraction of the three organs contains IAA‐oxidases with conventional kinetics. The function of this IAA oxidase is probably to degrade exogenous IAA.