干旱区生态环境知识资源中心(Arid): Photosynthesis of Digitaria ciliaris during repeated soil drought and rewatering

Arid

DOI	10.3724/SP.J.1226.2015.00081
	Photosynthesis of Digitaria ciliaris during repeated soil drought and rewatering
	Luo, YaYong; Zhao, XueYong; Zhang, JingHui; Li, YuLin; Zuo, XiaoAn; Sun, DianChao
通讯作者	Luo, YY
来源期刊	SCIENCES IN COLD AND ARID REGIONS
ISSN	1674-3822
出版年	2015
卷号	7 期号:1 页码:81-87
英文摘要	The ability of psammophyte photosynthesis to withstand and recover from severe droughts is crucial for vegetation stability in semi-arid sandy lands. The responses of gas exchange and chlorophyll fluorescence of an annual grass, Digitaria ciliaris, were measured through three soil drought and rewatering cycles. Results showed that the net photosynthesis rate (P-n) decreased by 92%, 95%, and 63% at end of the three drought periods, respectively, water use efficiency (WUE) decreased by 67%, 54%, and 48%, while the constant intercellular CO2 concentration (C-i) increased by 1.08, 0.88, and 0.45 times. During those three cycles, the trapping probability with no dark adaptation (F-v'/F-m') decreased by 55%, 51%, and 9%, the electron transport per cross section (ET0'/CS0') decreased by 63%, 42%, and 18%, and the dissipation per cross section (DI0'/CS0') increased by 97%, 96%, and 21%. These results indicated that D. ciliaris was subjected to photoinhibition and some non-stomatal limitation of photosynthesis under drought. However, after four days of rewatering, its photosynthetic characteristics were restored to control values. This capability to recover from drought may contribute to making the plant's use of water as efficient as possible. Furthermore, the photosynthesis decreased more slowly in the subsequent drought cycles than in the first cycle, allowing D. ciliaris to enhance its future drought tolerance after drought hardening. Thus, it acclimatizes itself to repeated soil drought.
英文关键词	chlorophyll fluorescence gas exchange repeated soil drought and rewatering JIP-test
类型	Article
语种	英语
收录类别	ESCI
WOS记录号	WOS:000390930900011
WOS关键词	WATER-STRESS ; STOMATAL CONDUCTANCE ; GAS-EXCHANGE ; RESPONSES ; PLANTS ; FLUORESCENCE ; LIMITATIONS ; RECOVERY ; TRAITS ; GROWTH
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/2XILL650/331299
作者单位	[Luo, YaYong; Zhao, XueYong; Zhang, JingHui; Li, YuLin; Zuo, XiaoAn; Sun, DianChao] Chinese Acad Sci, Cold & Arid Reg Environm & Engn Res Inst, Naiman Desertificat Res Stn, Lanzhou 730000, Gansu, Peoples R China
推荐引用方式 GB/T 7714	Luo, YaYong,Zhao, XueYong,Zhang, JingHui,et al. Photosynthesis of Digitaria ciliaris during repeated soil drought and rewatering[J]. 中国科学院西北生态环境资源研究院,2015,7(1):81-87.
APA	Luo, YaYong,Zhao, XueYong,Zhang, JingHui,Li, YuLin,Zuo, XiaoAn,&Sun, DianChao.(2015).Photosynthesis of Digitaria ciliaris during repeated soil drought and rewatering.SCIENCES IN COLD AND ARID REGIONS,7(1),81-87.
MLA	Luo, YaYong,et al."Photosynthesis of Digitaria ciliaris during repeated soil drought and rewatering".SCIENCES IN COLD AND ARID REGIONS 7.1(2015):81-87.