文献类型：期刊文献

中文题名：脱水胁迫对梭梭和胡杨苗叶绿素荧光特性的影响

英文题名：Influence of Dehydration on Characteristics of Chlorophyll Fluorescence of Detached Leaves in Haloxylon ammodendron and Populus euphratica

作者：施征[1] 史胜青[2] 肖文发[2] 齐力旺[3]

第一作者：施征

机构：[1]北京林业大学生物科学与技术学院;[2]中国林业科学研究院森林生态环境与保护研究所;[3]中国林业科学研究院林业研究所细胞生物学实验室

年份：2008

卷号：21

期号：4

起止页码：566-570

中文期刊名：林业科学研究

外文期刊名：Forest Research

收录：CSTPCD;;Scopus;北大核心:【北大核心2004】；CSCD:【CSCD2011_2012】；

基金：国家"十一五"科技支撑计划(2006BAD01A1606);中国博士后科学基金资助项目(20070410579)

语种：中文

中文关键词：梭梭;胡杨;脱水胁迫;叶绿素荧光

外文关键词：Haloxylon ammodendron ; Populus euphratica ; dehydration; chlorophyll fluorescence

分类号：Q945.11

摘要：应用IMAG ING-PAM荧光仪测定了离体脱水胁迫不同时期梭梭和胡杨的叶绿素荧光动力学参数。结果表明:离体胁迫初期(3 h)Fv/Fm、qP和ETR轻微降低,但胡杨的降低幅度比梭梭大;而此时qN却明显增加,胡杨的增加幅度远大于梭梭。随着离体时间的延长(6、12 h),胡杨的Fv/Fm、qP和ETR明显降低,梭梭的降低幅度仍相对较小;而此时qN呈降低趋势,梭梭低于对照水平,而胡杨仍旧高于对照。这也说明遭遇不同程度胁迫时,梭梭和胡杨启动了不同的过剩光能防御机制。
Haloxylon ammodendron and Populus euphratica are the dominant tree species that prevent desertification in northwest China. The parameters of chlorophyll a fluorescence kinetics were measured with IMAGING-PAM in the leaves of the two tree species during different detached time. The results showed that Fv/Fm, qP and ETR had a slight decrease, however, qN had a significant increase in the initial stage of detached stress. With the extension of detached time, Fv/Fm, qP and ETR of P. euphratica decreased dramatically compared to that of H. ammodendron. At these times, qN of H. ammodendron was also lower then that in the control, but that of P. euphratica was still higher than in the control, which demonstrated that these two desert tree species initiate different mechanism of enhanced non-photochemical energy dissipation.