干旱区生态环境知识资源中心(Arid): Studies on photoprotective mechanism of desert plant Reaumuria soongorica under progressive soil drying

Arid

	Studies on photoprotective mechanism of desert plant Reaumuria soongorica under progressive soil drying
	Liu, YuBing; Liu, MeiLing; Tan, HuiJuan; Wang, Jin; Zhou, ShengHui
通讯作者	Liu, YB
来源期刊	SCIENCES IN COLD AND ARID REGIONS
ISSN	1674-3822
出版年	2010
卷号	2 期号:3 页码:235-240
英文摘要	Reaumuria soongorica (pall.) Maxim, a perennial desert semi-shrub, is widely found in semi-arid areas of China. It shows strong tolerance to drought, high temperature and intense radiation in its natural habitat. In the present study, photoprotective mechanism of R. soongorica was investigated by analyzing diurnal variations of gas exchange and chlorophyll fluorecence parameters during progressive soil drying. The results show that leaf water potential of R. soongorica decreased when the soil water content dropped. Diurnal patterns of net photosynthetic rate (Pn) changed from "two peaks"to "one peak"under drought stress, and the leaf water use efficiency (WUE) increased under moderate drought and declined under severe drought. Pn, the primary maximum photochemical efficiency of PSII (Fv/Fm) and the quantum efficiency of non-cyclic electron transport of PSII (FPSII) decreased obviously at noon, and showed a photoinhibition phenomenon. But, the non-photochemical quenching of fluorescence (NPQ) soon reached its maximum in the day and then remained almost at the high level until 17: 00, indicating that the xanthophylls cycle-dependent thermal energy dissipation played an important role. Diurnal variations of the original chlorophyll fluorescence (Fo) increased at first and then decreased. The increased value of Fo under drought stress indicates that there was a reversible inactivation of PSII reaction center. These results indicate that the photoprotective mechanism in R. soongorica was the photoinhibition by using both the xanthophylls cycle-dependent thermal energy dissipation and the reversible inactivation of PSII reaction center under drought stress.
英文关键词	chlorophyll fluorescence drought stress net photosynthesis rate photo inhibition Reaumuria soongorica
类型	Article
语种	英语
收录类别	ESCI
WOS记录号	WOS:000422276300007
WOS关键词	DESICCATION TOLERANCE ; DROUGHT STRESS ; WATER-STRESS ; PHOTOSYNTHESIS ; RESPONSES ; ACCLIMATION ; METABOLISM ; RECOVERY ; LEAVES
WOS类目	Geography, Physical
WOS研究方向	Physical Geography
来源机构	中国科学院西北生态环境资源研究院
资源类型	期刊论文
条目标识符	http://119.78.100.177/qdio/handle/2XILL650/329564
作者单位	[Liu, YuBing; Liu, MeiLing; Tan, HuiJuan; Wang, Jin; Zhou, ShengHui] Chinese Acad Sci, Cold & Arid Reg Environm & Engn Res Inst, Extreme Stress Resistance & Biotechnol Lab, Shapotou Desert Res & Expt Stn, Lanzhou 730000, Gansu, Peoples R China
推荐引用方式 GB/T 7714	Liu, YuBing,Liu, MeiLing,Tan, HuiJuan,et al. Studies on photoprotective mechanism of desert plant Reaumuria soongorica under progressive soil drying[J]. 中国科学院西北生态环境资源研究院,2010,2(3):235-240.
APA	Liu, YuBing,Liu, MeiLing,Tan, HuiJuan,Wang, Jin,&Zhou, ShengHui.(2010).Studies on photoprotective mechanism of desert plant Reaumuria soongorica under progressive soil drying.SCIENCES IN COLD AND ARID REGIONS,2(3),235-240.
MLA	Liu, YuBing,et al."Studies on photoprotective mechanism of desert plant Reaumuria soongorica under progressive soil drying".SCIENCES IN COLD AND ARID REGIONS 2.3(2010):235-240.