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冷锻锻炼对不同水稻品种抗寒力的增强作用有明显差异.抗寒品种冷锻炼后,超氧物歧化酶(SOD)活性提高,细胞质膜电导率下降,这一状态能在5 d低温处理(5℃,4000 lx/12 h)中保持;而冷敏品种冷锻炼后,SOD活性只能在最初的2d内保持,并随低温处理时间延长而丧失,其电导率、丙二醛(MDA)、脯氨酸以及细胞器膜系统超微结构,都表现了类似的变化趋势.由此认为,冷锻炼对增强冷敏品种抗寒力的作用较小而短暂,提高水稻抗寒性的根本措施应是改造和提高抗寒的遗传基础.
Cold-forging exercise significantly differed in enhancing the cold-tolerance of different rice cultivars.Under cold-hardening, the activity of superoxide dismutase (SOD) increased and the conductivity of plasma membrane decreased, and this condition could be treated at low temperature (5 ℃, 4000 lx / 12 h). However, the activity of SOD was only maintained within the first 2 days after cold-stressing, and was lost with the prolongation of low-temperature treatment. The conductivity, MDA ), Proline and ultrastructure of organelle membrane system, all showed a similar trend of change.Therefore, it is considered that cold-training has a small and short-term effect on enhancing the cold resistance of cold-sensitive varieties, and the fundamental measures to improve the cold resistance of rice Should be transformed and improve the genetic basis of cold resistance.