以7个草莓新品种为试材，在-15～4 ℃范围内设置7个温度梯度处理，测定草莓叶片叶绿素、可溶性糖、游离脯氨酸及丙二醛(MDA)含量，以评价其抗寒性。结果表明，低温处理后，宁玉叶片中叶绿素含量最高；隋珠、宁玉的可溶性糖含量较高，但各品种间差异不明显。脯氨酸含量受到影响因素较多，不能从含量上判断与抗寒力强弱的相关性；京藏香的MDA含量一直较高，宁玉的MDA含量较低且稳定。宁玉的抗寒力最强，京藏香较弱，其他品种介于两者之间。

In order to evaluate cold tolerance of seven strawberry cultivars， we measured the contents of chlorophyll， soluble sugar， proline and malondialdehyde (MDA) after the plants were treated at seven different temperatures from -15 ℃ to 4 ℃. The results showed that after low temperature treatment， the chlorophyll content was highest in Ningyu leaves， the soluble sugar content of Suizhu and Ningyu was higher， but the difference was not obvious among the cultivar. Proline content is affected by many factors， so it cannot be judged from the content of the correlation with cold resistance strength; the MDA content of Jingzangxiang was always high， Ningyu was low and stable. The cold tolerance of Ningyu is strongest and of Jingzangxiang is weakest， and of other cultivars is intermediate.

S668.4

甘肃省青年科技基金项目(20JR10RA461)；甘肃省农业科学院重点研发计划项目(2020GAAS21)；甘肃省农业科学院院列中青年基金项目(2016GAAS48、2017GAAS80)。