水淹胁迫及排涝对榉树幼苗生长和生理特性的影响

Effect of Water Logging and Drainage on Growth and Physiological Properties of Zelkova serrata

以2年生榉树Zelkova serrata实生容器苗为实验材料,研究模拟根淹(RF)、半淹(SF)和近全淹(AF)处理及正常水分管理下(CK)榉树幼苗的生长和生理指标变化,以及水淹胁迫后的排涝恢复实验对这些指标的影响,综合评价榉树幼苗的耐水淹能力。结果表明,水淹35 d后,不同处理下的榉树幼苗出现了不同程度的落叶情况,但全部存活;水淹处理下榉树的苗高和地径相对增长量均小于CK;不同程度的水淹处理均使榉树叶绿素含量降低,但对抗氧化能力、膜脂过氧化作用以及渗透调节能力产生了不同的影响,各水淹处理下SOD和POD活性总体上呈先降后升的趋势,MDA含量总体上呈先升后降的趋势,可溶性糖和可溶性蛋白含量总体上呈波动性下降趋势。排涝14 d后,AF中榉树幼苗各项生理指标受到的负面影响最大,但植株仍具有生命力和萌芽力,表现出较强的耐淹性与恢复能力。

Experiments were conducted on water logging on 2-year container Zelkova serrata seedlings during August 1st of 205 and September 4th.Seedlings were treated by root flooding(RF),semi-submerged flooding(SF)and almost total flooding(AF),control(normal treatment)and after drainage.Determinations were implemented on growth and physiological properties at different stage of treatment.The results showed that seedlings treated by water logging had leaves fallen,but survived.Height and ground diameter growth of seedlings treated by water logging was smaller than the control,and chlorophyll content as well.The activity of superoxide dismutase(SOD)and peroxidase(POD)in leaves of seedlings treated by water logging decreased at first and then increased.The content of malondialdehyde(MDA)had an opposite trend.The content of soluble sugar and protein showed a trend of decreasing.Physiological properties of seedling 14 days after drainage had negative effect on water logging,it concluded that Z.serrata seedlings had recovery capability under mild and moderate water logging.