加拿大一枝黄花瘦果萌发对干旱胁迫响应研究  

The response characteristics of Solidago canadensis on seed germination to drought stress

作　　者：黄孟秋 李景吉[1,2,3] 陈欣 王思睿[1] 王国严 王吉鹏 王娟 彭培好 HUANG Mengqiu;LI Jingji;CHEN Xin;WANG Sirui;WANG Guoyan;WANG Jipeng;WANG Juan;PENG Peihao(Chengdu University of Technology,College of Environment and Ecology,Chengdu 610059,China;State Key Laboratory of Geohazard Prevention and Geoenvironment Protection(Chengdu University of Technology),Chengdu 610059,China;Institute of Ecological Resources and Landscape Architecture,Chengdu University of Technology,Chengdu 610059;College of Tourism and Urban-Rural Planning,Chengdu University of Technology,Chengdu 610059)

机构地区：[1]成都理工大学生态环境学院,成都610059 [2]地质灾害防治与地质环境保护国家重点实验室(成都理工大学),成都610059 [3]成都理工大学生态资源与景观研究所,成都610059 [4]成都理工大学旅游与城乡规划学院,成都610059

出　　处：《生态科学》2025年第1期156-164,共9页Ecological Science

基　　金：第二次青藏高原综合科学考察研究(2019QZKK0307);国家自然科学基金(41501060)。

摘　　要：入侵植物种子萌发对干旱环境响应策略是影响其种群分布和繁殖的重要因素,可为预测其分布范围、为干旱环境下种群生长防控提供理论依据。为探明入侵植物加拿大一枝黄花(Solidago canadensis L.,SC)瘦果萌发和胚轴生长对干旱胁迫响应策略,以SC连萼瘦果为萌发材料,采用不同渗透势(φ值分别为:0 MPa、–0.1 MPa、–0.2 MPa、–0.3 MPa、–0.4 MPa)聚乙二醇(Polyethylene glycol,PEG-6000)溶液模拟干旱胁迫条件进行萌发试验。结果表明,(1)不同干旱胁迫水平对SC瘦果发芽的抑制强度不同,强度干旱对SC瘦果发芽的抑制作用更强;(2)SC瘦果发芽对干旱胁迫具有明显的“滞后效应”,随干旱强度增加(φ值降低),这种“滞后效应”更为明显;(3)瘦果萌发对干旱胁迫响应表现出“K”策略,渗透势φ=<–0.35 MPa时,SC瘦果很少萌发或不再萌发。(4)胚轴生长较瘦果萌芽的发芽率、发芽势、发芽指数和活力指数对干旱胁迫的响应更为敏感,不同干旱胁迫水平对胚轴生长影响差异较大。The response strategy of invasive plant seed germination to a drought environment is an essential factor affecting its population distribution and reproduction.It can provide a theoretical basis for predicting its distribution range and preventing and controlling its population growth in a drought environment.In order to investigate the response strategies of the invasive plant Solidago canadensis L.(SC)for achenes germination and embryonic growth to drought stress.The effect of drought stress on achenes germination was examined by using different osmotic potentials of polyethylene glycol treatments(φvalues of 0 MPa,–0.1 MPa,–0.2 MPa,–0.3 MPa,and–0.4 MPa,respectively).The results showed that(1)different drought stress levels inhibited the germination of SC achenes with different intensities,and the intensity of drought inhibited the germination of SC achenes more strongly.(2)SC achenes germination had a pronounced"hysteresis response"to drought stress,and this"hysteresis effect"was more apparent when the intensity of drought increased(φvalue decreased).(3)Achenes germination showed a"K"strategy in response to drought stress,with little or no germination of SC achenes at an osmotic potentialφ=<–0.35 MPa.(4)Hypocotyl growth was more sensitive to drought stress than the germination rate,germination potential,germination index,and vigor index of achenes sprouting,and the effect of different drought stress levels on hypocotyl growth varied greatly.

关 键 词：加拿大一枝黄花 干旱胁迫 瘦果萌发 响应策略 

分 类 号：Q948.1[生物学—植物学]