Photosynthetic Units and Carbon Assimilation in Leaves of Grain Sorghum under Different Light Intensities |
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Authors: | Chenga Reddy V; Raghavendra A S; Das V S R |
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Institution: | Department of Botany, School of Biological & Earth Sciences, Sri Venkateswara University Tirupati 517 502, India |
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Abstract: | The Cyt f and P700 contents in leaves of three Sorghum, varietieswere measured, in relation to their carbon assimilation, underdifferent light intensities during growth. At the maximum irradiationused (1,800 µE m2 s1) the ratio of P700to Cyt f was close to unity, whereas under low irradiation (450µE m2 s1) the ratio of P700 to Cyt f rangedfrom two to three. A strikingly positive correlation existedbetween the P700 contents of the leaves and their rates of carbondioxide fixation, dry matter production and Cyt f contents,only when the plants were grown under high light intensities.The P700 content of the leaves in plants grown under low irradiationwas unrelated to the contents of Cyt f. Thus, at a high lightintensity there is a close relationship between the Cyt f andP700 levels, but at low intensities the amounts of electroncarriers and the reaction centre are independent. (Received March 7, 1983; Accepted August 24, 1983) |
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