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PHYTOCHROME CONTROL OF THE DEVELOPMENT OF PHOTOPHOSPHORYLATION
Author(s) -
OelzeKarow H.,
Mom H.
Publication year - 1978
Publication title -
photochemistry and photobiology
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.818
H-Index - 131
eISSN - 1751-1097
pISSN - 0031-8655
DOI - 10.1111/j.1751-1097.1978.tb07597.x
Subject(s) - photophosphorylation , phytochrome , sinapis , chlorophyll , botany , biology , chlorophyll a , far red , chemistry , biophysics , red light , chloroplast , biochemistry , gene , brassica
In the cotyledons of the mustard ( Sinapis ah L.) seedling the development of the capacity for photophosphorylation is strongly influenced by pretreatment of the seedling with red light pulses. The red light acts through phytochrome. After a red light pretreatment the capacity for photophosphorylation increases linearly with the chlorophyll content, at least up to 30 min after the onset of continuous white light. It is proposed that the reaction chain required for photophosphorylation is completed under the influence of phytochrome even in the absence of chlorophyll. As soon as chlorophyll becomes available photophosphorylation functions instantaneously. Without a red light pretreatment there is a lag of more than 15 min before photophosphorylation becomes detectable after the onset of continuous white light even though chlorophyll a is available. Although phytochrome strongly influences the rate of chlorophyll accumulation as well it is improbable that the control by phytochrome of development of photophosphorylation and of chlorophyll accumulation are causally connected.