零上低温处理对不同甘蓝型油菜品种抗寒性的影响

为鉴定甘蓝型油菜品种的抗寒性，采用人工气候箱控温的方法，对从国外引进的12个甘蓝型油菜品种进行零上低温处理，以观测不同品种抗寒指标的变化情况。结果表明：随着温度的降低，各品种叶片的含水量下降，细胞膜相对透性和丙二醛（MDA）含量增加，可溶性糖和游离脯氨酸含量上升，其中4个品种（系）表现出较强的抗寒性，2个品种（系）的抗寒性则相对较弱。相关分析结果表明：细胞膜相对透性和可溶性糖含量与甘蓝型油菜品种抗寒性的关系最为密切。

Effect of low temperature stress on some physiological index of winter rape(brassicu napus L.)

To indentify anti-coldness of B.napus L.varieties,temperature-controlling method by artificial climatic box is introduced to deal with 12 B.napus L.varieties from abroad under low temperature above zero for observance of different varieties' anti-coldness index variation.The results showed that total water content in leaves of all varieties decreased with the decrease of temperature,however,membrane relativepenetrat,malondialdehycle(MDA)content,soluble sugar and free proline content increased with the decrease of temperature.The varieties of Alice,Orkan,Hopper and Parade-2 were screened with high cold hardness,but Olsen and Embleme had lower cold hardness than the other varieties.Simple correlation analysis showed that membrane relative penetratio and soluble sugar content had the closest relations with the cold hardness of winter rape.