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THE BASIC ACTION OF GIBBERELLIC ACID IN ELONGATION OF ‘METEOR’ PEA STEMS
Author(s) -
ARNEY S. E.,
MANCINELLI P.
Publication year - 1966
Publication title -
new phytologist
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 3.742
H-Index - 244
eISSN - 1469-8137
pISSN - 0028-646X
DOI - 10.1111/j.1469-8137.1966.tb06349.x
Subject(s) - gibberellic acid , meristem , auxin , gibberellin , biology , mitosis , elongation , cell division , botany , plant stem , microbiology and biotechnology , colchicine , shoot , cell , germination , biochemistry , genetics , ultimate tensile strength , metallurgy , gene , materials science
S ummary The published evidence on the histological action of gibberellins does not favour the widespread belief that the primary action of gibberellic acid (GA) in stem growth is on cell elongation. Histological evidence from Meteor pea internodes shows that the main effect of GA is to stimulate cell division; and even when applied to internodes which have passed into the vacuolation phase of growth GA often re‐activates cell division. Mitotic activity in the apical meristem of Meteor pea stems is also stimulated by GA. The experimental results suggest that the primary effect of GA on caulescent plants, as on rosette plants, is to increase mitotic activity in apical and sub‐apical meristems; the cell elongation effect of GA may well be a derivative of the increased mitotic activity, possibly through an increased production of auxin in the meristematic region.