Changes in growth and leaf water status of sugarcane (Saccharum officinarum) during heat stress and recovery
2008
Gilani, S. (University of Agriculture, Faisalabad (Pakistan). Dept. of Botany) | Wahid, A. (University of Agriculture, Faisalabad (Pakistan). Dept. of Botany) | Ashraf, M. | Arshad, M. (University of Agriculture, Faisalabad (Pakistan). Inst. of Soil and Environmental Sciences) | Islam-ud-Din (University of Agriculture, Faisalabad (Pakistan). Dept. of Mathematics and Statistics)
A pot experiment was conducted to assess the changes in growth water content of control, heat stressed (42 plus minus 2 degree C) and recovered plants of heat-tolerant (CP-4333) and heat-sensitive (HSF-240) sugarcane varieties at formative (30 days), grand growth (150 days) and maturity (250 days after sprouting) stage of growth. One set of plants at each stage was kept in a growth room at 27 plus minus 2 degree C (control), two sets were shifted at 42 plus minus 2 degree C (heat stress) in a growth room and one of the heat stressed set shifted back to 27 plus minus 2 degree C for recovery. Measurements from all treatments were made at 24, 48 and 72 h. Under heat stress CP-4333 rolled the leaves more quickly than HSF-240. There was a reduction in the fresh weight but no change in the dry weight and leaf area, leading to a reduction in shoot fresh-to-dry weight ratio and leaf water potential. Upon recovery, both varieties de-rolled leaves, regained fresh weight and improved leaf water potential, but these changes were readily noted in CP-4333. Results suggested that improved heat tolerance in sugarcane was accompanied with curtailed water loss by leaf rolling and quicker reversal of these effects during recovery.
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