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| 尾叶桉、邓恩桉幼苗对低温胁迫的光合生理响应 | |
| 引用本文： | 刘建,黄宏富,朱光泰,周坚,叶露,项东云. 尾叶桉、邓恩桉幼苗对低温胁迫的光合生理响应[J]. 林业科技开发, 2008, 22(6) |
| 作者姓名： | 刘建 黄宏富 朱光泰 周坚 叶露 项东云 |
| 作者单位： | 1. 广西林业科学研究院中南速生材繁育重点实验室,南宁,530001;南京林业大学森林资源环境学院 2. 广西壮族自治区隆林各族自治县林业局 3. 南京林业大学森林资源环境学院 4. 广西林业科学研究院中南速生材繁育重点实验室,南宁,530001 |
| 基金项目： | 引进国际先进农业科技计划(948计划)，广西科学研究与技术开发计划项目 |
| 摘 要： | 以人工低温处理尾叶桉和邓恩桉幼苗,研究其对两种按树的光合生理特性的影响.结果表明:低温处理后两种桉树叶绿素含量下降、SOD活性上升、MDA含量增加,光合特性参数Pn、Gs和Tr下降,Ls值上升,而Ci则先上升后下降.进一步的分析表明,在持续低温胁迫的初始阶段,导致两种按树Pn的降低的主要因素为非气孔因素,而随着低温处理持续时间延长至48 h时,气孔限制因素也逐渐成为Pn的降低的主要因素之一.低温处理对两种按树的影响程度有较为明显的差异,对尾叶桉的影响明显要大于对邓恩按的影响. |
| 关 键 词： | 低温胁迫 光合特性 尾叶桉 邓恩桉 |
Photosynthetic and Physiological Responses of Eucalyptus urophylla and E. dunnii to Low Temperature Stresses |
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| LIU Jian,HUANG Hong-fu,ZHU Gnang-tai,ZHOU Jian,YE Lu,XIANG Dong-yun. Photosynthetic and Physiological Responses of Eucalyptus urophylla and E. dunnii to Low Temperature Stresses[J]. China Forestry Science and Technology, 2008, 22(6) | |
| Authors: | LIU Jian HUANG Hong-fu ZHU Gnang-tai ZHOU Jian YE Lu XIANG Dong-yun |
| Affiliation: | LIU Jian,HUANG Hong-fu,ZHU Guang-tai,ZHOU Jian,YE Lu,XIANG Dong-yun Key Laboratory of Fast-Growing Tree Breeding and Cultivation in Central South China,Guangxi Forestry Research Institute,530001 Nanning,China |
| Abstract: | Photosynthetic and physiological responses of E.urophylla and E.dunnii seedlings to low temperature stresses were measured in this paper.The results showed that net photosynthetic rate(Pn),Stomatal conductance(Gs),transpiration rate(Tr) and the content of chlorophyll of E.urophylla and E.dunnii seedling leaves decreased by low temperature treatments but stomata limitation(Ls) and the content of SOD and MDA increased.The intercellular CO2 concentration(Ci) increased first and then decreased.The decrease of Pn was mostly caused by non-stomatal factors at the beginning of low-temperature stresses,subsequently by stomatal factors and non-stomatal factors simultaneity.Photosynthetic and physiological responses of E.urophylla and E.dunnii to low temperature stress had obvious differences,and E.dunnii had an greater tolerance to low-temperature stresses than E.urophylla. |
| Keywords: | Low temperature stress Photosynthetic characteristic Eucalyptus urophylla Eucalyptus dunnii |
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