Physiological responses of barley to heat
1992
Nawarat Udomprasert (Kasetsart Univ., Bangkok (Thailand). Faculty of Agriculture. Dept. of Agronomy)
Barley has become an important food crop in Thailand. To produce adequate amount for consumption without importing, expanding the cultivating area is neccessary. However, high temperature is one of the limiting factors. This study intended to determine the effects of high temperature on some physiological characteristics of barley and provide the data for further improvement for heat tolerant cultivars. The experiments were carried out using 3 barley cultivars, AKB1, AKB2, and BRB2. The plants were exposed to 20, 25 and 30 deg C. Growth, yield, and proline content were determined. It was found that AKB1 and AKB2 had their best vegetative growth at 20 deg C, whereas BRB2 grew the best at 25 deg C, when growth was compared between temperatures within each cultivar. When compared between cultivars, BRB2 grew the best at all temperature. However, BRB2 did not flower and therefore had no grain yield at any temperature tested. Proline content in BRB2 increased with increasing temperature, i.e. 0.034, 0.030, and 0.046 mM/g fresh weight at 20, 25 and 30 deg C respectively. This suggests that BRB2 might accumulate proline at high temperature and consequently made it grow better than the other cultivars. It also suggests that proline content might be used to indicate plant heat tolerance.
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