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A KINETIC STUDY OF GROWTH MOVEMENTS AND PHOTOMORPHOGENESIS IN ETIOLATED PEA SEEDLINGS
Author(s) -
Galston A. W.,
Tuttle A. A.,
Penny Pauline J.
Publication year - 1964
Publication title -
american journal of botany
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 1.218
H-Index - 151
eISSN - 1537-2197
pISSN - 0002-9122
DOI - 10.1002/j.1537-2197.1964.tb06709.x
Subject(s) - etiolation , biology , phototropism , elongation , photomorphogenesis , botany , darkness , apex (geometry) , biophysics , blue light , kinetics , optics , biochemistry , physics , materials science , quantum mechanics , ultimate tensile strength , arabidopsis , gene , mutant , metallurgy , enzyme
The kinetics of the effects of inductive photomorphogenically active light on etiolated peas have been studied by means of time‐lapse photography. The effects noted include: (1) A light‐induced decrease in the rate of stem elongation, beginning about 6 hr after the light treatment, and ending about 18 hr later. (2) A light‐induced opening of the apical hook, beginning ca. 2–5 hr after light treatment, and reaching its peak rate ca. 6 hr later. (3) A light‐stimulated circumnutation, starting usually about 15–22 hr after the light, and resulting in a decreased period of oscillation (from ca. 86 to ca. 76 min) and an increased amplitude (from 15° total angular displacement to about 40°). (4) A promotion of terminal bud growth, known from previous work to start at about 4 hr after irradiation and to reach a peak about 12 hr later. (5) A “bobbing” movement of the apex, apparently involving reversible hook and stem oscillations, which appears to be of endogenous origin and insensitive to light. These data furnish a kinetic background against which proposed biochemical mechanisms of de‐etiolation can be assessed.