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The Effect of Gibberellin on Tryptophan Conversion and Elongation of the Avena Coleoptile
Author(s) -
Valdovinos Jack G.,
Sastry K. S. Suryanarayana
Publication year - 1968
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.1399-3054.1968.tb07359.x
Subject(s) - coleoptile , avena , elongation , auxin , tryptophan , gibberellin , gibberellic acid , tryptamine , chemistry , biochemistry , biology , biophysics , botany , germination , amino acid , materials science , gene , metallurgy , ultimate tensile strength
Gibberellic acid (GA 3 ) enhanced directly the release of 14 CO 2 from tryptophan‐1‐ l4 C by cell free preparations of Avena coleoptile tips. The rate of tryptophan metabolism in the presence of GA 3 was increased by approximately 100 per cent. The addition of auxin synthesis inhibitors to incubation flasks nullified the enhancement effect of GA 3 on elongation of the coleoptile tips. These studies implicate tryptamine as an intermediate in the formation of auxin from tryptophan. The possibility of GA 3 ‐IAA interaction in the elongation processes was also investigated. Combination treatments of these growth‐promoting substances did not induce a synergistic growth response by the coleoptile tissue.