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Evidence of phytochrome involvement in the entrainment of the circadian rhythm of carbon di oxide metabolism in bryophyllum fedtschenkoi


, : Evidence of phytochrome involvement in the entrainment of the circadian rhythm of carbon di oxide metabolism in bryophyllum fedtschenkoi. Planta (Heidelberg) 138(3): 271-278

The rhythm of CO2 output in Bryophyllum leaves was entrained on exposure to 0.25 h of white light every 24 h. Entrainment also occurred on similar exposure to nomochromatic radiation in spectral bands centered at 660 nm and, to a lesser extent, at 730 nm, but a band centered at 450 nm was without effect. A skeleton irradiation program comprising two 0.25 h exposures to white light per 24 h also entrained the rhythm when the intervening dark periods were either 7.5 h and 16 h, or 10.5 h and 13 h. The rhythm disappeared when the 2 exposures were separated by 11.5 h and 12 h dark periods. Regular 0.25 h exposures to red light separated by 11.75 h periods of darkness also resulted in loss of the rhythm. Red/far-red reversibility was observed in irradiation schedules having either 1 or 2 exposures to red light daily. In the latter case, far-red reversal of the efects of one of the exposures to red light resulted in entrainment of the rhythm by the other, instead of abolition of the rhythm. The occurrence of distinct red/far-red reversibility suggests strongly that phytochrome is the pigment involved in entrainment of this rhythm by cycles of light and darkness.

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