PREVENTION BY PHYTOCHROME OF PHOTODELAY IN CHLOROPHYLL ACCUMULATION |
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Authors: | H. Oelze-Karow, H. Rö sch,H. Mohr |
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Affiliation: | Biological Institute II, University of Freiburg. D-78 Freiburg. W. Germany |
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Abstract: | A photodelay in chlorophyll- a and -b accumulation is observed in mustard ( Sinapis alba L.) cotyledons during the first 3 h after the onset of white light even at medium light fluxes (3500 lx). A pretreatment of two red light pulses or a 12 h far-red light pretreatment, both operating through phytochrome. prevent the photodelay completely. This is a specific phytochrome effect since'it can be separated from the effects of phytochrome on the rates during pre-steady state and steady state phases of chlorophyll accumulation in saturating white light. Thus, photostability of chlorophyll in nature is a photoresponse mediated through phytochrome. |
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