李子幼苗水分亏缺下新梢生长与致死时间研究

Research on Shoot Growth and Lethal Time of Plum Seedling under Water Deficit Stress

以晚红、晚黄、长李15号、吉红、吉胜幼苗为试材,人工模拟水分亏缺,开展了不同时期新梢生长速率对水分亏缺敏感性、断水后致死时间等研究。结果表明:新梢生长速率与植株给水量间存在线性相关性,晚红、长李15号、吉胜3份资源对水分亏缺敏感,晚黄、吉红对水分亏缺不敏感;晚红、吉胜、长李15号不同时期断水后,致死时间较长,晚黄、吉红较短,即晚红、吉胜、长李15号抵抗极端干旱能力强于晚黄、吉红。

In this experiment, the plum seedlings of Wanhong, Wanhuang, Changli No.15, Jihong and Jishengwere used as test materials. The sensibility of shoot growth rate resistant to water deficit and lethal time after stop-ping water supply at different development stages were studied by artificial simulated water deficit treatments. Theresults showed that there are linear corelation between shoot growth rates and water quantities. Three plum cultivars,Wanhong, Changli No.15, and Jisheng were sensitive to water deficit, but Wanhuang and Jihong were not sensitiveto water deficit. The lethal times of Wanhong, Changli No.15, and Jisheng were longer than those of Wanhuang andJihong after stopping water supply at different development stages, which indicated the extreme drought resistancesof Wanhong, Changli No.15, and Jisheng were better than those of Wanhuang and Jihong.