低温弱光对黄瓜幼苗生长及抗氧化酶活性的影响

以设施栽培黄瓜为材料。研究了常温弱光和低温弱光胁迫期间以及随后的恢复过程中植株生长和抗氧化酶的变化．结果表明，常温弱光和低温弱光胁迫分别导致黄瓜植株生长减缓和停滞。根系活力下降．低温弱光处理过程中。SOD和GPOD活性上升，并以7℃处理尤为明显。但在恢复过程中这些酶的活性均恢复至对照水平．常温弱光对SOD活性影响不大，但在恢复过程中SOD活性则上升到一个比对照更高的水平，GPOD活性在弱光处理5d后迅速上升，恢复期间呈下降趋势．此外，常温弱光和低温弱光胁迫均造成MDA累积。

Effects of chilling and low light on cucumber seedlings growth and their antioxidative enzyme activities

Studies on the growth and antioxidative enzyme activities of cucumber seedlings grown under low light and low temperature indicated that exposure of cucumber plants to low light at normal temperature and chilling under low light resulted in a retardation and a complete inhibition of plant growth, respectively, and their root vigor was also decreased. Chilling under low light increased the activities of SOD and GPOD, showing more significant effects at 7 degrees C than at 12 degrees C. The activities of these enzymes returned to normal after 5 days of recovery under normal conditions. Low light at normal temperature didn't affect SOD activity, which was increased when the plants were returned to normal growth conditions. GPOD activities increased markedly after 5 days of low light treatment and decreased during recovery. In addition, the content of MDA was increased during chilling and low light treatment.