干旱胁迫及复水对伊犁绢蒿幼苗生长及生理特性的影响

doi:10.11733/j.issn.1007-0435.2020.05.005

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摘要为研究伊犁绢蒿（Seriphidium transiliense）幼苗对干旱胁迫的适应能力，本研究采用盆栽控水法分析了持续干旱胁迫及复水过程伊犁绢蒿幼苗生长及生理指标的变化。结果表明：随着干旱胁迫的加剧，幼苗地上部分生长逐渐减慢，重度干旱胁迫下幼苗株高和地上生物量较对照分别降低了50.29%和50.82%（P<0.01）；幼苗根长、地下生物量和根冠比则持续增加，重度干旱胁迫下各指标较对照分别增加了11.41%，10.69%和125.09%（P<0.05）；叶片相对含水量、叶绿素含量和根系活力持续下降；叶片和根系的相对电导率、丙二醛含量、可溶性糖和脯氨酸含量、超氧化物歧化酶和过氧化物酶活性逐渐升高，而可溶性蛋白质含量和过氧化氢酶活性则呈先升高后降低的趋势。综上所述，伊犁绢蒿幼苗可以通过调节生长和生物量的分配，并通过积累渗透调节物质和提高抗氧化酶活性来清除活性氧，维持其在干旱胁迫下的生长；复水后，叶片和根系的渗透调节物质及抗氧化酶活性大多能恢复至中度干旱胁迫水平，表明伊犁绢蒿幼苗具有较强的干旱适应能力。

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	陈爱萍
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	王堃
	安沙舟

关键词 ：伊犁绢蒿幼苗, 干旱胁迫, 复水, 生长, 生理特性

Abstract：To investigate the adaptability of S. transiliense seedlings to drought stress,a pot experiment was conducted to analyze the growth and physiological indexes of S.transiliense seedlings under continuous drought stress and re-watering. The results showed that,as drought stress increased,plant height and aboveground biomass decreased continuously,which decreased by 50.29% and 50.82% compared with control under severe drought stress,respectively. Root length,belowground biomass and root-shoot ratio increased continuously,which increased by 11.41%,10.69%,and 125.09% compared with control under severe drought stress,respectively. The relative water content(RWC)and chlorophyll content of leaves,and root vigor(RV) decreased continuously. Relative conductivity(RC),the contents of malondialdehyde(MDA),soluble sugar(SS)and proline(Pro),and the activities of superoxide dismutase(SOD)and peroxidase(POD)increased gradually,the soluble protein(SP)content and catalase(CAT) activity increased and then decreased in leaves and roots. In conclusion,the growth and biomass distribution of S. transiliense seedlings can be regulated,and the active oxygen can be removed by accumulating osmotic regulators and increasing antioxidant enzyme activities,to maintain seedling growth under drought stress. After re-watering,osmotic regulators and antioxidant enzyme activities of leaves and roots recovered to the moderate drought stress level,indicating that S. transiliense seedlings had strong drought adaptability.

Key words： Seriphidium transiliense seedlings Drought stress Re-watering Growth Physiological characteristics

收稿日期: 2020-03-31

ZTFLH:

S945.78

基金资助:国家科技基础资源调查专项-中国荒漠主要植物群落调查项目（2017FY100201）资助

通讯作者: 王堃, 安沙舟 E-mail: wangkun@cau.edu.cn;xjasz@126.com

作者简介: 陈爱萍(1976-),女,新疆乌鲁木齐人,博士研究生,副教授,主要从事牧草种质资源开发与利用研究,E-mail:xjauchenaiping@sina.com

引用本文:

陈爱萍, 隋晓青, 王玉祥, 靳瑰丽, 王堃, 安沙舟. 干旱胁迫及复水对伊犁绢蒿幼苗生长及生理特性的影响[J]. 草地学报, 2020, 28(5): 1216-1225. CHEN Ai-ping, SUI Xiao-qing, WANG Yu-xiang, JIN Gui-li, WANG Kun, AN Sha-zhou. Effects of Drought and Re-watering on Growth and Physiological Characteristics of Seriphidium transiliense Seedlings. Acta Agrestia Sinica, 2020, 28(5): 1216-1225.

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