摘要： 研究低温、干旱锻炼和外喷ABA对黄瓜幼苗的生理影响，初步探讨交叉适应现象的机理。结果表明，三种处理均提高了黄瓜幼苗的抗冷性和脱落酸（ABA）含量，体内ABA含量与幼苗抗冷力呈极显着正相关。低温锻炼不仅提高了过氧化物酶的活性，而且出现了一条新的同工酶带。这条酶带是在处理前细胞内已存在的mRNA上翻译而来。在锻炼过程中喷施5FU和DDTC均降低了幼苗处理的效果。低温、干旱锻炼不但影响了体内激素的平衡，提高了细胞内渗透调节物质的含量，而且也使控制代谢的酶系统发生了相应改变。

关键词: 黄瓜, 幼苗, 抗冷性

Abstract: The physiological effects of cold hardening,drought hardening and abscisic acid(ABA)spraying on cucumber seedlings were studied,and the mechanism of plant cross-adaptation in stress was investigated.Three seedling treatments all improved the chilling resistance of cucumber seedlings and ABA content.The ABA content was significantly correlated with the chilling resistance.The peroxidase activity was significantly enhanced by cold hardening,and a new band of isoenzyme was found.The new band resulted from the translation of the mRNA which already existed in cells before hardening.Spraying 5-fluorouracil(5-FU)and DDTC during the hardening process reduced the effects of seedling hardening.Cold hardening and drought hardening of cucumber seedlings affected the balance of endogenous hormones in the plant,increased the content of osmosis-regufating substances and changed the enzyme system.

Key words: Cucumber, Seedling hardening, Chilling resisrance

中图分类号: 

• S642.204.3