高温胁迫下9种轻型屋顶绿化植物的生理响应  

Response of Physiology of 9 Extensive Green Roof Plants to High Temperature Stress

作　　者：胡杏 钟丽媚 倪建中 王伟 代色平 HU Xing;ZHONG Limei;NI Jianzhong;WANG Wei;DAI Seping(Guangzhou Institute of Forestry and Landscape Architecture,Guangzhou,Guangdong 510405,China)

机构地区：[1]广州市林业和园林科学研究院,广东广州510405

出　　处：《林业与环境科学》2022年第6期116-123,共8页Forestry and Environmental Science

基　　金：广州市科技计划项目“广州园林植物科技资源圃运行费”;广东省重大科技专项(2013A011401004)。

摘　　要：以9种轻型屋顶绿化植物为材料,通过人工气候室模拟高温,以25℃为对照,设置35、40、45、55℃4个胁迫处理,研究不同温度胁迫下9种植物的形态变化和丙二醛、脯氨酸、可溶性蛋白质和可溶性糖4种生理指标对不同温度的的响应,计算各指标的耐热系数、进行相关性及主成分分析,并基于主成分分析法综合评价其耐热性强弱,筛选出适宜广州气候的轻型屋顶绿化植物。结果表明:随着胁迫温度的升高,丙二醛与可溶性糖整体呈先升后降的趋势、脯氨酸呈上升趋势,可溶性蛋白主要在55℃有不同程度的下降,植物间4个指标的变化幅度存在显著差异;通过综合分析得出9种植物的耐热性强弱依次为:铺地锦竹草Callisia repens>大花马齿苋Portulaca grandiflora>假紫万年青Belosynapsis ciliata>红趾草Callisia repens ‘Bolivian Jew’>重瓣大花马齿苋Portulaca grandiflora ‘Double Peony’>紫米粒Portulaca gilliesii>凹叶景天Sedum emarginatum>大苞水竹叶Murdannia bracteata>薄雪万年草Sedum hispanicum,筛选出铺地锦竹草、大花马齿苋、假紫万年青、红趾草、重瓣大花马齿苋作为广州轻型屋顶绿化植物。This study aimed to select the most heat-tolerant plant from 9 species optimum for the extensive green roof. The contents of malondialdehyde(MDA), proline, soluble protein, soluble sugar in leaves and plant appearance were observed under high temperatures(35℃, 40℃, 45℃ and 55℃, while 25℃ as control) in the phytotron that simulate high-temperature environment. The heat-tolerance coefficients, correlation and principal components of measured indexes were calculated and analyzed before the heat tolerance of tested plants was comprehensively evaluated. The contents of MDA and soluble sugar showed a rise and then reduce with the high temperature rising in general, the contents of proline showed a rise, whereas the contents of soluble protein have decreased in varying degrees of 9 species at 55 ℃. The rangeabilities between the 4 physiological indexes were significantly different. At the circumstance of 55 ℃, The heat resistance rank of 9 plants was Callisia repens > Portulaca grandiflora > Belosynapsis ciliata > C. repens ‘Bolivian Jew’>P. grandiflora ‘Double Peony’ > P. gilliesii > Sedum emarginatum > Murdannia bracteata > S. hispanicum. According to our experiments, the first five taxa were suitable for use as extensive green roof plants in Guangzhou.

关 键 词：轻型屋顶绿化 耐热性 生理指标 主成分分析 

分 类 号：S731.2[农业科学—林学]