西北林学院学报2001，Vol.16Issue(2)：10-14,5.
土壤干旱胁迫下沙棘休眠、萌芽期内源激素变化及外源GA3的调节
Changes of Endogenous Hormone of Sea buckthorn in Dormancy Stage and Sprout Period under Soil Water Stress and Exogenous GA3 Regulation
摘要
Abstract
This paper deals with the relationship among water content、endogenous hormone and sprout rate of two years old China sea-buckthorn under soil water stress.The effect of spraying exogenous GA3 in critical time was also researched.The main results show that water content and endogenous GA3 decreased due to water stress ,in the meantime endogenous ABA increased evidently during dormancy stage in winter and sprout period in spring,which lead to the ratio of GA1/3/ABA fell and reached threshold value later.Seedlings under serious water deficit sprouted 25 days later compared to that of control and grew slowly after sprout.Sprout date of seedlings under medium water deficit was postponed about 10 days and growth after sprout was limited slightly.Spraying exogenous 80 mg/L GA3 solution can increase endogenous GA1/3 and GA1/3/ABA of sea-buckthorn with ABA content declining under serious water deficit,so sprout date and growth was promoted effectively.However,spraying exogenous 80 mg/L GA3 solution had little effect on seedlings under appropriate water content and medium water content.关键词
土壤干旱/休眠期/萌芽期/内源激素/外源GA3/沙棘分类
农业科技引用本文复制引用
李丽霞,梁宗锁,魏宇昆,韩蕊莲..土壤干旱胁迫下沙棘休眠、萌芽期内源激素变化及外源GA3的调节[J].西北林学院学报,2001,16(2):10-14,5.
