Responses to chilling stress in French bean seedlings: antioxidant compounds
1998
El-Saht, H.M. (University of Mansoura (Egypt). Faculty of Science)
French bean (Phaseolus vulgaris cv. Contender) plants at five developmental stages (4, 8, 12, 16 and 20 d after sowing) were exposed to one of three treatments: l - 25 C (control), 2-exposure to chilling at 10 deg C only for 2 d prior to sampling, and 3-long-term exposure to chilling at 10 deg C. Short- and long-term chilling decreased plant growth. Higher concentrations of ascorbate and glutathione were found in the chilling-treated plants throughout the different period of growth in comparison with those in the control plants. The activities of superoxide dismutase, ascorbate peroxidase, and glutathione reductase increased in the chilling-treated seedlings while activities of catalase and peroxidase and of beta-carotene content decreased in young chilling-treated plants and slightly increased in older ones.
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