干旱胁迫及复水对黄连花幼苗生长和生理特性的影响  

Effects of drought stress and rewatering on seedling growth and physiological characteristics of Lysimachia davurica

作　　者：张彦妮[1] 雷蕾[1] 夏斌[1] 

机构地区：[1]东北林业大学园林学院,黑龙江哈尔滨150040

出　　处：《草业科学》2016年第9期1681-1689,共9页Pratacultural Science

基　　金：黑龙江省留学归国基金项目(LC201410);黑龙江省教育厅科研项目(12543012)

摘　　要：以盆栽黄连花(Lysimachia davurica)幼苗为材料,研究了20d的干旱胁迫和复水对植株部分形态特征及叶片抗旱相关生理指标的影响。结果表明,随着胁迫时间的增加,其生长发育逐渐受到抑制。当胁迫时间低于10d以及土壤含水量不低于14.52%时,其地上部生长受到一定的抑制,叶片失水,单叶面积减小,叶绿素含量、MDA含量、可溶性糖、脯氨酸以及抗氧化酶(POD、CAT)活性升高,此时复水,除了茎尖,植株可以迅速恢复生长。当胁迫时间持续增加到15d,叶片严重失水,地上部干枯,此时复水,66.66%的植株可以重新长出幼苗。但当胁迫时间达到20d时,植株因缺水干旱死亡。因此,黄连花在管理养护时,在持续干旱时间超过10d,土壤含水量低于14.52%时,应及时复水救苗。The effect of 20 ddrought stress and rewatering on seedling morphological and physiological characteristics of Lysimachia davurica were studied.The results showed that growth and development of L.davurica were gradually inhibited as drought stress extended.The growth of above ground part of seedling was depressed first when drought stress lasted for less than 10 days and soil moisture content was higher than14.52%.The leaf area and relative water content were reduced,while chlorophyll content,MDA content,soluble sugar,proline,POD and CAT activities of seedling were increased.The plant could quickly restored growth except the shoot tip when rewatering at this time.When drought stress lasted for 15 days,the seedling severely lost water and the upper part of the seedlings shriveled.66.66% new sprout grew after rewatering.L.davurica would be dying and could not be revived after rewatering if drought stress lasted for 20 days.Therefore,L.davuricashould be rewatered timely to rescue seedling when the drought stress was more than 10 days and the soil moisture content was less than 14.52%.

关 键 词：黄连花 干旱胁迫 复水 形态特征 生理指标 

分 类 号：S682.19[农业科学—观赏园艺]