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Journal of Biological Sciences

Year: 2001 | Volume: 1 | Issue: 11 | Page No.: 1088-1092
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Research Article

Impact of Optimal and Superoptimal Temperatures on the Photosynthetic Apparatus of Cotton Leaves

M. A. Sethar, V. Mala Pahoja, Q. I. Chachar and D. L. Laidman

ABSTRACT

The leaves of cotton cultivars Qalandri, MNH-93, Rehmani and S-12 were stressed for 2 h at 30 (control), 35, 38, 40, 42, 43, 44, 45 and 46°C to quantify the damage caused to chloroplast photosynthetic apparatus by chlorophyll fluorescence technique. There was 10-30% decrease in Fv/Fm ratio up to the temperature stress of 40°C. But at 44°C the cultivars showed considerably higher damage to photosynthesis process by recovering only 10, 13, 37 and 50% of the Fv/Fm ratio by the cultivars MNH-93, Qalandri, Rehmani and S-12 respectively.
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