Written Paper

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) et al.

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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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International Journal of Agriculture and Biology (Pakistan)

ISSN : 1560-8530