摘要
【目的】探究海刀豆幼苗在水分胁迫下的生长及生理响应特征,为其幼苗期的水分管理和优质滨海沙地植物的培育提供参考。【方法】以1年生海刀豆幼苗为试材,通过盆栽控水试验模拟干旱(土壤相对含水量20%、40%、60%)、适宜水分(80%,对照)和水涝(100%)环境,分析其生长及生理指标。【结果】在旱涝胁迫下,海刀豆幼苗叶干重显著降低,叶相对含水量显著升高;苗高、叶面积在水涝下显著升高,在较重干旱下显著降低;总根长、总根表面积、总根体积、根平均直径在干旱下升高,水涝下降低。在旱涝胁迫下,幼苗叶片丙二醛含量及CAT和POD活性显著升高,SOD活性相对稳定,可溶性蛋白含量减少,可溶性糖和脯氨酸含量显著升高,初始荧光显著升高,最大荧光、最大光化学效率、最大量子产率显著降低;叶绿素含量均在较重干旱下显著降低。【结论】海刀豆幼苗主要通过改变水分的积累和分配格局提高CAT、POD活性以及可溶性糖和脯氨酸含量减轻水分胁迫伤害,表现出较强抗旱耐涝能力。
[Objective]The study aims to explore the growth and physiological response of Canavalia maritima seedlings to water stress,and provide a reference for water management during the seedling stage and for the cultivation of high-quality plants in coastal sandy lands.[Methods]One-year-old C.maritima seedlings were subjected to simulated drought stress(soil relative water content at 20%,40%,and 60%),suitable water condition(80%,control),and waterlogging(100%)with water control experiment in pots.Their growth and physiological indices were analyzed.[Results]Under both drought and waterlogging stress,leaf dry weight was decreased,while leaf relative water content was increased.Seedling height and leaf area were increased under waterlogging but decreased under severe drought stress.Total root length,total root surface area,total root volume,and mean root diameter were increased under drought stress and decreased under waterlogging.The content of malondialdehyde and the activities of catalase(CAT)and peroxidase(POD)were increased,while the activity of superoxide dismutase(SOD)was rela-tively stable.Soluble protein content was decreased,whereas soluble sugar and proline contents were in-creased under water stress.The chlorophyll content was decreased under severe drought stress.Initial flu-orescence was increased,while maximum fluorescence,maximum photochemical efficiency,and maximum quantum yield were decreased under water stress.[Conclusion]C.maritima seedlings demonstrate strong tolerance to drought and waterlogging stress by altering water accumulation and distribution patterns,in-creasing the activities of CAT and POD,and enhancing soluble sugar and proline contents.
作者
蔡娟
招礼军
朱栗琼
金贇
赵元圆
CAI Juan;ZHAO Lijun;ZHU Liqiong;JIN Yun;ZHAO Yuanyuan(Guangxi Key Laboratory of Forest Ecology and Conservation,Key Laboratory of National Forestry and Grassland Administration on Cultivation of Fast-Growing Timber in Central South China,College of Forestry,Guangxi University,Nanning 530004,China;Guangxi Vocational University of Agriculture,Nanning 530007,China)
出处
《西北植物学报》
CAS
CSCD
北大核心
2024年第11期1682-1691,共10页
Acta Botanica Boreali-Occidentalia Sinica
基金
国家自然科学基金项目(31260093,31560061)
广西自然科学基金项目(2013GXNSFAA019057)。
关键词
海刀豆
水分胁迫
生长
生理指标
Canavalia maritima
water stress
growth
physiological indicators
