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Interaction of phytohormones and far‐red irradiation on the nyctinastic closing of Albizzia julibrissin pinnules
Author(s) -
Tanada Takuma
Publication year - 1983
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.1399-3054.1983.tb00727.x
Subject(s) - far red , phytochrome , abscisic acid , red light , biology , botany , kinetin , gibberellin , auxin , cytokinin , hormone , biochemistry , in vitro , explant culture , gene
In order for far‐red radiation at 760 nm to delay dark closing of Albizzia julibrissin pinnules, red light must be given simultaneously with or just prior to it. Studies have been made to determine whether a phytohormone can replace this red light requirement. Abscisic acid, gibberellin, kinetin, and indole‐3‐acetic acid have been found to replace the red light. Indole‐3‐carboxylic acid and a cytokinin antagonist are ineffective. In this hormone and far‐red interaction, all hormones are effective at μ M or lower concentrations. The hormones show no interaction with red light at 660 nm. Simultaneous irradiation at 550 nm negates the effect of hormone and far‐red interaction in delaying leaflet closing. These results are additional evidence that an unidentified far‐red absorbing pigment could be involved with phytochrome in some far‐red‐mediated processes.