摘要
以2年生盆栽实生苗为研究材料,通过人工模拟干旱胁迫环境,探索4水平干旱胁迫(土壤含水量分别为田间持水量的75%～80%、55%～60%、40%～45%和30%～35%)对银杏叶萜内酯类物质季节变化的影响。结果表明:干旱胁迫下,生长季节不同,银杏叶内白果内酯BB、银杏内酯GC、GA、GB及总萜内酯含量变化具有显著差异,随着生长季节的变化银杏叶萜内酯类物质含量变化呈"先升高后降低"的趋势。适度干旱条件下可以促进银杏萜内酯类物质的合成,尤其轻度和中度干旱条件下,萜内酯含量比适宜水分条件下明显增多。考虑到叶产量、叶萜内酯类物质含量以及采叶与采时的关系等,在实际生产中可以考虑在植物生长初期,给予银杏苗正常的水分供应以获得最大的生物产量,在6—10月份叶片发育完全后适当进行轻度干旱处理(土壤水分含量为田间持水量的55%～60%)收获叶片,可获得最大的萜内酯单株有效经济产量。
The effects of drought stress on terpene lactones contents of Ginkgo biloba grown in pots at 4 soil moisture levels under greenhouse conditions were investigated.The results showed that there were significant effects on the contents of bilobalide BB,ginkgolide GC,GA,GB and total terpene lactones in different growing seasons.With the development of season,terpene lactones contents were increased first and then decline at the subsequent.Moderate drought conditions can contribute to the synthesis of terpene lactones.The terpene lactones contents in mild and moderate drought conditions significantly increased if compared with the terpene lactones contents in appropriate water condition.Concerning the leaf yield,terpene lactones contents as well as the relationship between quantity and time of leaf collection,we suggested that the highest economic yield per single plant could be obtained by controlling soil water content at mild level(relative water content,55%-60%) and harvesting leaves in June to October.
出处
《林业科技开发》
2011年第6期15-20,共6页
China Forestry Science and Technology
基金
国家自然科学基金项目(编号:31070557)
关键词
银杏
干旱胁迫
萜内酯
动态变化
Ginkgo biloba
drought stresses
terpene lactones
dynamic change
