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Maintenance of the diurnal petiolar movement by exogenous indole‐3‐acetic acid under day‐night cycles in Mimosa pudica
Author(s) -
Morimoto Naoaki,
Shichijo Chizuko,
Watanabe Shinobu,
Suda Shozo,
Hashimoto Tohru
Publication year - 1986
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.1399-3054.1986.tb01914.x
Subject(s) - petiole (insect anatomy) , gibberellic acid , abscisic acid , mimosa pudica , kinetin , biology , botany , indole 3 acetic acid , chemistry , auxin , biochemistry , germination , in vitro , explant culture , hymenoptera , gene
Effects of plant hormones on the diurnal movement of the petiole of Mimosa pudica L. were examined under the conditions of day‐night cycles. Surgical removal of the leaf at the middle of the petiole led to gradual loss of the movement. Aqueous solutions of indole‐3‐acetic acid (IAA) applied as a pulse each day 10 μl at (10 −6 −10 −5 M ) or continuously (10 −8 −10 −6 M ) to the cut end of the petiole maintained a diurnal movement that has the same phase of oscillation as that shown in the intact leaf. Pulse treatments given at different times of the day had no effect on the phase of the oscillation. Higher concentrations of the acid gave larger amplitudes. Other hormones such as gibberellic acid, kinetin and [R,S]‐abscisic acid or 1‐aminocyclopropane‐1‐carboxylic acid did not show diurnal movement‐maintaining activities of IAA. Gibberellic acid disturbed the phase of the diurnal movements and kept the petiole elevated at very high positions. A possible action mechanism of IAA is discussed.