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Gibberellin‐Growth Retardant Interactions on the Growth and Flowering of Clerodendrum thomsoniae
Author(s) -
KORANSKI D. S.,
McCOWN B. H.,
STRUCKMEYER B. E.,
BECK G. E.
Publication year - 1979
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.1399-3054.1979.tb01669.x
Subject(s) - gibberellin , shoot , biology , botany , plant growth , bioassay , vine , gibberellic acid , horticulture , germination , genetics
Gibberellin‐growth retardant interactions on the vegetative growth and flowering of the vine Clerodendrum thomsoniae Balf. were studied using both exogenous treatments and biologically testing the acid fraction attained from the plant extract. The growth retardant, ancymidol, greatly retarded stem elongation and markedly increased flowering under inductive environments. Gibberellin A 3 (GA 3 ) application to the shoot tip stimulated vine growth, prevented flowering under inductive environments, and completely overcame ancymidol‐induced effects. In contrast to GA 3 , treatment with GA 7 had little effect on vegetative growth but increased flowering under inductive environments. The elevated activity of gibberellin‐like compounds, as determined by bioassay, were similar except for a marked increase in levels in ancymidol‐treated plants grown under inductive environmental conditions. Microscopic examination of the stem tip indicated that the action of the growth regulators involved the induction of floral buds. Thus, in Clerodendrum , ancymidol appears to stimulate an unknown gibberellin(s) and simultaneously acts antagonistically with GA 3 .