干旱胁迫对顶果木生理特性及根系形态特征的影响  

Effects of Drought Stress on Acrocarpus fraxinifoliusa Physiological and Biochemical Changes of Root System Morphological Characteristics and Mechanism

作　　者：李付伸 覃德文[2] 杜佩连 秦武明[2] 钟连香 

机构地区：[1]广西国有维都林场,广西来宾546112 [2]广西大学林学院,南宁530004

出　　处：《湖北农业科学》2016年第8期2019-2022,共4页Hubei Agricultural Sciences

基　　金：广西壮族自治区"十一五"科技支撑计划项目[桂科字(2013)第19号]

摘　　要：通过盆栽试验,用Win Rhizo根系分析软件,分析不同模拟干旱胁迫条件对顶果木(Acrocarpus fraxinifoliusa Wight ex Arn.)根系生长和生理动态的影响。结果表明,干旱胁迫降低了顶果木叶片CAT活性及MDA含量,升高了SOD、POD活性,这些生理变化能有效降低植物细胞膜脂过氧化的程度,提高了顶果木抗干旱胁迫的能力。并且根半径在逐渐降低,根系皮层和维管束厚度随干旱胁迫程度的加重总体趋势在变薄,这有利于水分与营养物质的输送。说明顶果木具备一定的抗旱能力,可在广西大力推广种植。Through pot experiment and Win Rhizo root system analysis software, the analysis of different simulated drought stress conditions on top of Acrocarpus fraxinifoliusa Wight ex Arn. root system growth and physiological dynamic effects. The results showed that drought stress reduced the A. fraxinifoliusa leaf CAT activity and MDA content and increased SOD, POD activity, these physiological changes can effectively reduce the degree of plant cell membrane lipid peroxidation and improve A. fraxinifoliusa drought resistance ability. And root radius is gradually reduced, the root cortex and vascular cylinder thickness with the drought stress degree aggravating the overall trend in the thinning, which is conducive to the transport of water and nutrients. That A.fraxinifoliusa has the capacity of drought resistance, and can be planted in Guangxi to promote.

关 键 词：顶果木(Acrocarpus fraxinifoliusa Wight EX Arn.) 干旱 根系 生理特性 

分 类 号：S511.01[农业科学—作物学]