The effect of red light in the high irradiance reaction of phytochrome:
作者:
C. B. JOHNSON,
期刊:
Plant, Cell&Environment
(WILEY Available online 1980)
卷期:
Volume 3,
issue 1
页码: 45-51
ISSN:0140-7791
年代: 1980
DOI:10.1111/1365-3040.ep11580522
出版商: Blackwell Publishing Ltd
数据来源: WILEY
摘要:
Abstract.A proposal has recently been made (Johnson&Tasker, 1979) that phytochrome acts through the multiplicative effect of two components of the phytochrome system, only one of them beingPfrand the other a product of the photoconversion reactionPr→Pfr. It has been shown previously that HIR action spectra based on this assumption show a good resemblance to the observed responses with the possible exception of the red region of the spectrum. There, a greater response is predicted than is often observed and fluence rate dependency is predicted, on which matter there is disagreement in the literature.The experiments reported here show that, because chlorophyll is formed in red light but not in far‐red, chlorophyll screening lowers theeffectivefluence rate in red light with respect to phytochrome. When such screening is eliminated the observed responses show strong fluence rate dependency, as predicted. Evidence is also presented to support the conclusion that the two proposed effectors must act together multiplicativ
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