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

	Photosynthesis of Digitaria ciliaris during repeated soil drought and rewatering
	Luo Yayong; Zhao Xueyong; Zhang Jinghui; Li Yulin; Zuo Xiaoan; Sun Dianchao
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 sta-bility 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) de-creased by 67%, 54%, and 48%, while the constant intercellular CO_2 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 (ET_0′/CS_0′) decreased by 63%, 42%, and 18%, and the dissipation per cross section (DI_0′/CS_0′) increased by 97%, 96%, and 21%. These results indicated that D. ciliaris was subjected to photoinhi-bition 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	CSCD
WOS研究方向	Science & Technology - Other Topics
CSCD记录号	CSCD:5362392
资源类型	期刊论文
条目标识符	http://119.78.100.177/qdio/handle/2XILL650/335452
作者单位	Luo Yayong, Naiman Desertification Research Station, Cold and Arid Regions Environmental and Engineering Research Institute, Chinese Academy of Sciences, Lanzhou, Gansu 730000, China.; Zhao Xueyong, Naiman Desertification Research Station, Cold and Arid Regions Environmental and Engineering Research Institute, Chinese Academy of Sciences, Lanzhou, Gansu 730000, China.; Zhang Jinghui, Naiman Desertification Research Station, Cold and Arid Regions Environmental and Engineering Research Institute, Chinese Academy of Sciences, Lanzhou, Gansu 730000, China.; Li Yulin, Naiman Desertification Research Station, Cold and Arid Regions Environmental and Engineering Research Institute, Chinese Academy of Sciences, Lanzhou, Gansu 730000, China.; Zuo Xiaoan, Naiman Desertification Research Station, Cold and Arid Regions Environmental and Engineering Research Institute, Chinese Academy of Sciences, Lanzhou, Gansu 730000, China.; Sun Dianchao, Naiman Desertification Research Station, Cold and Arid Regions Environmental a...
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],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.