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Phytochrome control mechanisms in leaf expansion of Phaseolus vulgaris cv. Limburg.
Author(s) -
HOREMANS S.,
ONCKELEN H. A.,
GREEF J. A.
Publication year - 1984
Publication title -
plant, cell and environment
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 2.646
H-Index - 200
eISSN - 1365-3040
pISSN - 0140-7791
DOI - 10.1111/1365-3040.ep11589766
Subject(s) - phytochrome , phaseolus , etiolation , photostationary state , red light , biology , photomorphogenesis , botany , pulse (music) , far red , horticulture , mutant , physics , biochemistry , optics , photoisomerization , isomerization , detector , arabidopsis , gene , enzyme , catalysis
. The effectiveness of a red‐light pulse acting through phytochrome in inducing primary leaf expansion in 9‐d‐old etiolated bean ( Phaseolus vulgaris L. ev. Limburg) seedlings is strongly increased by a continuous far‐red light (CFR) pretreatment. This increase in effectiveness of a red pulse is positively correlated with the time and the fluence rate of the CFR pretreatment. Escape from photoreversibility of this red pulse after the CFR pretreatment is extremely slow (more than 3 d). When a dark period is interposed between the end of the CFR pretreatment and the inductive red pulse the photoreversible part of the response to this pulse is highly dependent upon the photostationary state of phytochrome at the onset of the dark period. The results give strong evidence for the synergistic activity of two components of phytochrome action during leaf growth induction, one of them acting via a very stable Pfr fraction.