论文部分内容阅读
对辽宁西北部主要绿化树种杨树、榆树、丁香和山杏的抗旱生理性状进行研究,分析春季干旱胁迫下4个树种叶片与根系生理性状间的关系,采用隶属函数法和灰色关联度法对其抗旱性进行评价.结果表明:渗透调节物质可溶性糖、可溶性蛋白和脯氨酸含量、抗氧化酶——超氧化物歧化酶(SOD)、过氧化物酶(POD)和过氧化氢酶(CAT)活性,以及丙二醛含量在4个树种及不同器官(叶片与根系)中均存在显著差异.4个树种平均隶属函数值在叶片中的顺序为榆树(0.673)>丁香(0.412)>杨树(0.346)>山杏(0.245),在根系中的顺序为杨树(0.558)>丁香(0.552)>山杏(0.383)>榆树(0.315);杨树、丁香和山杏叶片平均隶属函数值小于根系,而在榆树叶片中大于根系.各项生理指标与抗旱性的关联顺序在叶片中表现为丙二醛>SOD>CAT>可溶性蛋白>脯氨酸>可溶性糖>POD,在根系中为丙二醛>可溶性蛋白>可溶性糖>CAT>POD>脯氨酸>SOD.4个树种的叶片和根系中抗旱能力不同,各抗旱指标在叶片与根系中的作用不同,对不同树种的不同器官应该采取不同的管护措施.
The drought resistance physiological characters of poplar, elm, clove and apricot in the main greening tree species in the northwestern part of Liaoning Province were studied. The relationship between the leaf physiological characteristics and the root physiological characteristics of the four tree species under spring drought stress was analyzed. Membership function and gray relational analysis The results showed that the content of soluble sugar, soluble protein and proline, antioxidant enzymes superoxide dismutase (SOD), peroxidase (POD) and catalase CAT activity and the content of malondialdehyde in four species and different organs (leaves and roots) were significantly different.The order of the average membership function among the four species was in the order of elm (0.673)> clove (0.412)> Poplar, clove and apricot (0.245), the order of poplar (0.558)> clove (0.552)> apricot (0.383)> elm (0.315) The functional value was smaller than that of the root system and larger than that of the root system in elm leaves.The order of association of physiological indices with drought resistance was MDA> SOD> CAT> soluble protein> proline> soluble sugar> POD in roots In the malondialdehyde> soluble protein> soluble sugar> CAT> POD> Acid> SOD.4 a different species of leaves and roots drought resistance, drought index in the role of different leaves and roots of different organs of different species should adopt different management and protection measures.