Effects of light quality and fluence rate on synthesis of chlorophyll and chloroplast thylakoid polypeptides in maize and black pine
1998
Milivojevic, D. (Institute for Application of Nuclear Energy, Belgrade - Zemun (Yugoslavia))
Maize and black pine were grown and exposed to red, blue and alternative red and blue lights (fluence rate of 10-20 micromol/square ms) for 5 days. The alternating illumination contained photoperiods of the red and blue light, starting and ending with the red light. The quantities chlorophyll a, b and LHC proteins of the photosystem 2 were determined in maize primordial leaves and black pine cotyledons. The red light at fluence rates over 10 micromol/square ms was more stimulative in the chlorophyll a accumulation in both plants than the blue light and the alternative illumination. The alternative illumination in accumulation of this chlorophyll was between the red and blue light and in a function of the energetic level. Lower levels of the light fluence rate 10 micromol/square ms Equation lead to the alternating illumination being more stimulative than red light. The accumualtion of the chlorophyll b and LHC-2 proteins depend on plant species, light quality and fluence rate. The red light and the alternating illumination were the most efficient in accumulation of LHC-2 proteins in maize and black pine, respectively. The blue light and the alternating illumination reduced quantities of chlorophyll a, b and LHC-2 proteins in maize, while only quantities of chlorophyll a were reduced in black pine. The effect of the alternating red-blue illumination was stimualtive or repressive on chlorophylls and LHC proteins depending on the light rate and plants. This suggests that the fluence rate controlled activation/deactivation of the photoreceptor at the level of the cells of different species.
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