油菜素内酯对三个树种苗木抗旱性影响的综合评价

采用盆栽控水模拟土壤干旱环境,根系浸蘸和叶面喷施不同浓度的油菜素内酯(BR)溶液,对黄土丘陵区3个主要造林树种沙棘(Hippophae rhamnoides L.)、山杏(Prunus armeniaca L. var.ansu)、紫穗槐(Amorpha fruticosa L.)苗木20项抗旱性指标进行了测定,应用主成分分析法对3种苗木受油菜素内酯影响的抗旱性变化做了多指标的综合评价.实验结果显示当BR施用浓度在0.1-0.3 mg/L时,对3种苗木抗旱性影响的有效值均高于对照,其中能够有效提高3种苗木抗旱性的BR最佳施用浓度为0.2 mg/L.

Comprehensive evaluation of effect of brassonolide on drought resistance of seedlings of three tree species

Twenty indexes for drought-resistance were measured under simulating soil drought by using potted-seedlings to controlling soil water and dipping roots and spraying leaves of seedlings of Hippophae rhamnoides L. , Prunus armeniaca L. vat. ansu and Amorpha fruticosa L. with brassinolide of different concentrations. Based on that the effect of brassinlide on drought resistance of seedlings of three tree species was comprehensively evaluated by using principal component analysis. The results showed that with concentration between 0.1 - 0.3 mg/L the values of effect of brassinolide on drought resistance of seedlings of three tree species were higher than that of untreated. The best brassinolide concentration was 0.2 mg/L for effectually increasing drought resistance of seedling of the three tree species.