Growth control by phytochrome of de-etiolated bean hypocotyls mediated by chlorophyll fluorescence [Paseolus vulgaris, elongation]
1980
Roth-Berjerano, N. (Ben-Gurion Univ. of the Negev, Beer-Sheva (Israel). Dept. of Biology)
The elongation of hypocotyls excised from de-etiolated seedlings of beans (Phaseolus vulgaris L. cv. British Wax) is inhibited by light, blue and red irradiations being equally effective. Conditions which decrease chlorophyll fluorescence, such as CO(,2)-free air, abolish the inhibitory effect of blue irradiation and enhance the inhibition by red light. Conversely, conditions which increase chlorophyll fluorescence, such as N(,2) atmosphere or irriadation through a chlorophyll filter, abolish the inhibitory effect of red light and enhance the inhibition by blue irradiation. The inhibitory effect of blue light is reversible by red irradiation under increased fluorescence as well as by far red. We propose that the chlorophyll fluorescence excited by blue and red irradiations in lambda(, F) 660 nm and lambda(, F) 720 nm, respectively, is responsible for the inhibitory effect of blue light and the reduction of the inhibitory effect of non fluorescing red light. Both red and blue wavelengths seem, therefore, to control hypocotyl elongation through phytochrome
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