摘要
采用盆栽控水法研究黄山紫荆Cercis chingii 1年生幼苗在干旱胁迫下的形态变化和生理响应机制。结果表明,随着干旱胁迫时间的增加,黄山紫荆的叶片、嫩枝逐渐出现萎蔫、枯落;在干旱胁迫15 d时,叶片中的可溶性糖、可溶性蛋白、丙二醛(MAD)含量和抗氧化酶活性开始升高;持续干旱胁迫20d时,抗氧化酶的活性如CAT(过氧化氢酶)、POD(过氧化物酶)、SOD(超氧化物歧化酶)活性均达到峰值,而后出现不同程度的下降;质膜相对透性随着干旱胁迫时间的延长而持续增加。以上结果表明,在干旱胁迫早期,黄山紫荆通过维持自身的抗氧化酶系统活性,调控植物体的正常生理代谢功能;在干旱胁迫中期,通过维持较高水平的渗透调节物质、抗氧化酶活性和MAD含量来抵御干旱胁迫,减轻干旱伤害;在干旱胁迫后期,黄山紫荆体内代谢紊乱,各项生理指标值降低,植株受到伤害。综上可知,黄山紫荆具有较好应对干旱胁迫的调节能力,有一定的抗旱耐旱潜力。
In March 2015,1-year Cercis chingii seedlings were potted at greenhouse in Changsha,Hunan province.From August 26th of the same year,drought stress was conducted on potted seedlings by water control to study morphology and physiological properties.The result demonstrated that with duration of drought stress,leaves and twigs were gradually wilting and withering.The contents of soluble sugar,soluble protein,malondialdehyde and the antioxidant enzyme activities in leaves of tested seedlings increased until the 15th days of drought stress.CAT,POD,and SOD reached peaks until the 20th day of drought stress,and then declined.While the relative permeability of the plasma membrane continued to increase with the duration of drought stress.The experiment resulted that C.chingii had potential to drought stress.
作者
田晓明
陈新文
颜立红
蒋利媛
向光锋
李高飞
谭知虎
TIAN Xiao-ming;CHEN Xin-wen;YAN Li-hong;JIANG Li-yuan;XIANG Guang-feng;LI Gao-fei;TAN Zhi-hu(Hunan Forest Botanical Garden,Changsha 410116,China;Jiangyong Forestry Bureau of Huan,Yongzhou,431125,China)
出处
《浙江林业科技》
2021年第2期23-28,共6页
Journal of Zhejiang Forestry Science and Technology
基金
中央财政林业科技推广项目(﹝2018﹞X01号)。
关键词
黄山紫荆
干旱胁迫
生长形态
生理特性
Cercis chingii
drought stress
morphology
physiological property
作者简介
田晓明,博士,高级工程师,从事珍贵乡土树种选育、珍稀濒危植物保护与利用方面的研究,E-mail:tianxiaoming1986@126.com。
