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Interaction between the effects of phytochrome and gibberellic acid on the senescence of Alstroemeria pelegrina leaves
Author(s) -
Doorn Wouter G.,
Lieburg Marius J.
Publication year - 1993
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.1399-3054.1993.tb01803.x
Subject(s) - gibberellin , phytochrome , gibberellic acid , darkness , chlorophyll , far red , botany , biology , red light , chemistry , horticulture , germination
Chlorophyll loss in the leaves of cut flowering branches of Alstroemeria pelegrina L. cv. Stajello, placed in water in darkness at 20°, was inhibited by irradiation with red light and by the inclusion of gibberellic acid (GA 3 ) in the water. The effects of red light were abolished when it was followed by far‐red light. Effects of GA 3 and red light were additive over a range of GA 3 concentrations (0. 01–1 μ M ). Chlorophyll breakdown was increased by the inclusion of AMO‐1618, ancymidol, or tetcyclasis in the water. The effect of these inhibitors of gibberellin synthesis was fully reversed by GA 3 . The inhibition of chlorophyll breakdown by red light was absent when AMO‐1618, ancymidol or tetcyclasis were included in the water. The results indicate that leaf yellowing is controlled by endogenous gibberellins and that the effect of phytochrome is mediated by gibberellin synthesis.