低温胁迫下水稻幼苗抗寒生理指标分析

以龙稻5、龙稻13、中龙香粳1号和东农420为试验材料，测定了低温胁迫后其幼苗叶片中叶绿素、脯氨酸、丙二醛和电导率的变化。结果表明：低温胁迫后，叶绿素含量与对照相比均呈下降趋势，脯氨酸、丙二醛和电导率3个生理指标与对照相比均呈上升趋势，且不同品种的水稻各个指标的含量变化不同。低温胁迫对实验材料影响较大，龙稻5耐低温胁迫的能力较强。

Effects of Low Temperature Stress on Chill-resistance Physiological Index of Rice Seedlings

With Longdao No.5,Longdao No.13,Zhonglong Fragrant Japonica No.1 and Dongnong No.420 as the experiment rice material,the effects of chilling stress on the physiological index such as Chlorophyll, Proline,Malondialdehyde（MDA）and Conductivity Content in seedling leaves were studied. The results showed that： Compared to the control,chlorophyll content declined after chilling stress. While the physiologi-cal index such as Proline,MDA and Conductivity Content increased compare to the control. The content of different physiological index was varied in the rice varieties. Chilling stress has a great influence on the ex-perimental materials and the Longdao No.5 rice has great Chill-resistance ability.