为了研究冬油菜越冬期生理特性与其抗旱性的关系，筛选抗旱性较强的冬油菜品种，以9个冬油菜品种为试验材料，对油菜叶片超氧化物歧化酶(SOD)、过氧化氢酶(POD)、过氧化氢酶(CAT)活性、相对电导率、相对含水量、可溶性糖含量等生理生化指标进行了检测。结果表明，越冬期冬油菜叶片中的POD和CAT活性含量都有不同程度的增加，天油2号、天油4号、天油8号叶片POD和CAT活性增幅大于陇油6号、陇油7号、陇油8号、陇油9号。冬油菜叶片SOD活性在越冬期呈先升高后降低的趋势，可溶性糖含量、相对电导率在越冬期都呈现上升趋势，叶片相对含水量则呈现下降趋势。综合来看，9个冬油菜品种中，天油2号、天油4号、天油8号为强抗旱品种，延油2号、宁油2号为中抗旱品种；陇油7号、陇油8号、陇油9号为弱抗旱品种，陇油6号为抗旱敏感型品种。

In order to study the relationship between physiological characteristics and drought resistance of winter rapeseed during the overwintering period， the leaves of nine winter rapeseed varieties superoxide dimutase(SOD) activity， peroxidase (POD) activity， catalase(CAT) activity， relative electrical conductivity，relative water content and soluble sugar content were examined under field condition. The aim of this research was to screen out the varieties with strong drought resistance. The results showed that the activities of POD and CAT in the leaves of winter rapeseed increased in different degrees， and the increase of POD and CAT activities in leaves of Tianyou 2， Tianyou 4 and Tianyou 8 was greater than that of Longyou 6， Longyou 7， Longyou 8 and Longyou 9. The SOD activity of winter rape leaves increased first and then decreased during the overwintering period. The content of soluble sugar and leaf conductivity showed an increasing trend during the overwintering period， while the relative water content of leaves showed a decreasing trend. On the whole， among the 9 winter rapeseed varieties， Tianyou 2， Tianyou 4 and Tianyou 8 were high drought-resistant varieties； Yanyou 2 and Ningyou 2 were medium drought-resistant varieties； Longyou 7， Longyou 8 and Longyou 9 were weak drought-resistant varieties； Longyou 6 was drought-resistant sensitive varieties.

S565.4

天水市科技支撑计划“强抗寒优质甘蓝型冬油菜新品种选育”(2021-NCK-2888)；河北省重点研发计划“强耐寒甘蓝型冬油菜种质资源发掘创新及育种利用”(20326318D)。