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干旱条件下水稻(Oryza sativa L.)耐旱性较强的“湘中籼2号”比耐旱性较弱的“湘早釉12号”O_2~-的产生速率低。百草枯(0.01mmol/L)和H_2O_2(10mmol/L)处理促进干旱对水稻幼苗的伤害,但耐旱性较强的品种伤害较轻。单独用百草枯处理后,耐旱性较强的品种比耐旱性较弱的品种能更大幅度地提高超氧物歧化酶和过氧化物酶的活性;而H_2O_2处理后耐旱性较强的品种能提高过氧化氢酶活性。这些结果表明,耐旱性较强的水稻品种有较强的抗氧化胁迫能力。
The drought-tolerant “Xiangzhongxian No.2” rice with low drought stress had lower O_2 ~ - production rate than that of Xiangzao Glaze 12 with low drought tolerance. Paraquat (0.01 mmol / L) and H_2O_2 (10 mmol / L) promoted the damage to rice seedlings by drought, but the varieties with stronger drought tolerance harmed less. After treated with paraquat alone, the stronger drought tolerant cultivars could increase the activities of superoxide dismutase and peroxidase more than those with weaker drought tolerance, but the stronger drought tolerant H 2 O 2 treatment The variety can increase catalase activity. These results indicate that rice varieties with stronger drought tolerance have stronger antioxidant capacity.