测定比较了以二年生苹果砧木山定子与陇东海棠盆栽幼苗正常供水和中度干旱胁迫下的叶片丙二醛、可溶性糖、可溶性蛋白、游离脯氨酸含量及抗氧化酶活性。结果表明，随着干旱胁迫时间延长，2种植物的丙二醛、可溶性糖、游离脯氨酸和过氧化物酶活性持续上升，且在整个胁迫过程中2种植物间差异显著；可溶性蛋白含量则不断降低，且于第7 d后差异显著。中度干旱胁迫下，超氧化物歧化酶和过氧化氢酶活性于胁迫第7 d达到最大值，随后不断下降，表明2种植物前期对活性氧的清除能力较强，随胁迫时间加长其抗氧化能力减弱。综合分析，山定子的抗旱能力强于陇东海棠。

The effects of normal water supply and moderate drought stress on malondialdehyde， soluble sugar， soluble protein， free proline content and antioxidant enzyme activity of two-year apple rootstocks Malus baccata and Malus kansuensis were studied. The results showed that the activities of malondialdehyde， soluble sugar， free proline and peroxidase of the two rootstocks increased continuously with the prolongation of drought stress， and the differences between the two varieties were significant during the whole stress process， while the content of soluble protein decreased continuously， and the differences between the two varieties were significant after the 7th day. Under moderate drought stress， the activity of superoxide dismutase and catalase reached the maximum value on the 7th day of stress， and then decreased continuously， indicating that the scavenging ability of active oxygen in the early stage of two rootstocks was higher， and its antioxidant ability decreased with the increase of stress time. According to the comprehensive analysis， the drought resistance of apple rootstock Malus baccata is stronger than Malus kansuensis.

S661.1

甘肃省苹果产业科技攻关项目(GPCK2013-3)；农业农村部西北地区果树科学观测实验站(S-10-18)。