干旱胁迫及复水对刺槐苗水分运输过程的影响  

The impact of drought and rewatering on water transportation process of Robinia pseudoacacia L. seedlings

作　　者：王丁[1,2] 杨雪[2] 韩鸿鹏[2] 张丽琴[2] 薛建辉[1] 

机构地区：[1]南京林业大学生物与环境学院,南方现代林业协同创新中心,江苏南京210037 [2]河南教育学院生命科学系,河南郑州450046

出　　处：《南京林业大学学报（自然科学版）》2015年第1期67-72,共6页Journal of Nanjing Forestry University：Natural Sciences Edition

基　　金：国家林业公益性行业科研专项项目(201104002);河南省教育厅自然科学基金项目(2011B180017);河南教育学院青年科研课题(20100102);江苏高校优势学科建设工程资助项目(PAPD)

摘　　要：为探讨在干旱胁迫及复水条件下,植物对体内水分运输过程的调控能力,以盆栽2年生刺槐苗木为材料,用改良的"冲洗法"测定了干旱及复水处理条件下刺槐苗木体内水分运输过程参数。结果表明:1刺槐苗木水分运输过程胁迫指数随干旱胁迫程度的增大而增大,不同处理间胁迫指数均差异显著(P<0.05)。不同时期刺槐苗木水分运输过程胁迫指数从大到小呈现为:生长初期、生长旺期、生长末期的趋势。2干旱胁迫复水24 h后,刺槐苗木水分运输过程参数均有不同程度恢复,恢复度变化随干旱胁迫程度的增加而减小,不同处理间恢复度均差异显著(P<0.05)。3干旱胁迫复水24 h后,刺槐苗木水分运输过程存在补偿效应且主要出现在苗木的生长旺期轻度干旱胁迫条件下,补偿指数随胁迫强度的增加而下降,不同处理间差异显著(P<0.05)。因此,干旱胁迫会对植物造成一定的伤害,然而植物为保持正常的生理活动,能够启动一系列应激反应来阻止、降低或修复干旱胁迫造成的伤害且恢复程度与苗木生长时期及干旱胁迫程度密切相关。复水24 h后,刺槐苗木水分运输过程存在明显补偿现象,这是生物保存自身的一种重要机制,弥补干旱胁迫对苗木所造成的损失。Drought is one of the most stressful conditions limiting plant yield around the world. However, plants have developed multiple strategies to cope with environmental constraints. This study aimed to investigate the ability of Robinia pseudoacacia L. （2 years old） to regulate the process of water transportation in vivo under condition of drought and re-watering. Measurements of water transportation process parameters（ water potential of leaves,leaf specific conductivity, relative water content of leaves and water consumption of seedlings） were made in R. pseudoacacia（ 2 years old） under condition of drought and re-watering. Results showed that： （1）R. pseudoacacia seedlings （2 years old） water transportation process stress index（Si） with the degree of drought stress increased and Si among different treatments was significantly different（ P〈0. 05）. （2）Re-watering after drought stress 24 h, R. pseudoacacia seedlings （2 years old） water transport transportation process parameters had different degree of recovery, restoration degree（Rd） decreases with the increase of the degree of drought stress and Rd among different treatments was significantly different（ P〈0. 05）.（3）Re-watering after drought stress 24 h, compensation effect of R. pseucloacacia seedlings（ 2 years old） water transportation process was seen in the early growth stage of mild drought stress. Compensation index（Ci） decreased with the increase of drought stress. There were significant differences among different treatments（ P〈0. 05 ）.The conclusions were as follows：Drought stress could cause some damage to the water transportation process of plants, plants in order to maintain normal physiological activities,however, be able to start a series of stress response to prevent, reduce or repair the damage and the degree of recovery was closely related to growth period of seedlings and the degree of drought stress. This ability of seedlings to reduce or repair the injury was an essential index

关 键 词：刺槐 干旱胁迫 水分运输 补偿效应 

分 类 号：S718[农业科学—林学]