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Effects of light quality and norflurazon on the formation of plastid pigments in cotyledons of pinus sylvestris


Acta Botanica Sinica 27(1): 57-62
Effects of light quality and norflurazon on the formation of plastid pigments in cotyledons of pinus sylvestris
The rate of synthesis of carotenoids in far-red light is relatively higher than that of chlorophylls, on the contrary in red light the rate of chlorophyll synthesis is higher. When biosynthesis of carotenoids is inhibited in white light the rate of total chlorophyll synthesis was reduced to a similar degree. Accumulation of chlorophyll, however, is relatively much more than that of carotenoids. The highest molar ratio of chlorophyll/carotenoids is approximately 10.0. Chlorophyll and carotenoid synthesis apparently proceed with certain independence. After 4 h exposure of strong white light of 9 day-old pine seedlings grown with 10-5 mol 1-1 norflurazon in far-red light, contents of carotenoids and total chlorophyll of cotyledons increase. Chlorophyll a biosynthesis promotion by light is higher than photooxidation of the pigment.


Accession: 005312000



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