Protective mechanism of desiccation tolerance in Reaumuria soongorica: Leaf abscission and sucrose accumulation in the stem
文献类型：期刊论文
| 作者 | Liu YuBing; Zhang TengGuo; Li XingRong; Wang Gang |
| 刊名 | SCIENCE IN CHINA SERIES C-LIFE SCIENCES
 |
| 出版日期 | 2007-02-01 |
| 卷号 | 50期号:1页码:15-21 |
| 关键词 | Reaumuria soongorica desiccation photosynthesis sucrose water use efficiency leaf abscission |
| ISSN号 | 1006-9305 |
| DOI | 10.1007/s11427-007-0002-8 |
| 通讯作者 | Wang Gang(wangg@lzu.edu.cn) |
| 英文摘要 | Reaumuria soongorica (Pall.) Maxim., a perennial semi-shrub, is widely found in semi-arid areas in northwestern China and can survive severe desiccation of its vegetative organs. In order to study the protective mechanism of desiccation tolerance in R. soongorica, diurnal patterns of net photosynthetic rate (Pn), water use efficiency (WUE) and chlorophyll fluorescence parameters of Photosystem 11 (PSII), and sugar content in the source leaf and stem were investigated in 6-year-old plants during progressive soil drought imposed by the cessation of watering. The results showed that R. soongorica was characterized by very low leaf water potential, high WUE, photosynthesis and high accumulation of sucrose in the stem and leaf abscission under desiccation. The maximum Pn increased at first and then declined during drought, but intrinsic WUE increased remarkably in the morning with increasing drought stress. The maximal photochemical efficiency of PSII (Fv/Fm) and the quantum efficiency of noncyclic electric transport of PSII(Phi(PSII)) decreased significantly under water stress and exhibited an obvious phenomenon of photoinhibition at noon. Drought stressed plants maintained a higher capacity of dissipation of the excitation energy (measured as NPQ) with the increasing intensity of stress. Conditions of progressive drought promoted sucrose and starch accumulation in the stems but not in the leaves. However, when leaf water potential was less than -21.3 MPa, the plant leaves died and then abscised. But the stem photosynthesis remained and, afterward the plants entered the dormant state. Upon rewatering, the shoots reactivated and the plants developed new leaves. Therefore, R. soongorica has the ability to reduce water loss through leaf abscission and maintain the vigor of the stem cells to survive desiccation. |
| 收录类别 | SCI |
| WOS关键词 | BOEA-HYGROMETRICA ; WATER-DEFICIT ; DROUGHT ; PHOTOSYNTHESIS ; PLANTS ; LEAVES ; DEHYDRATION ; RESPONSES ; STRESS ; DESERT |
| WOS研究方向 | Life Sciences & Biomedicine - Other Topics |
| WOS类目 | Biology |
| 语种 | 英语 |
| WOS记录号 | WOS:000245146700003 |
| 出版者 | SCIENCE CHINA PRESS |
| URI标识 | http://www.irgrid.ac.cn/handle/1471x/2555974 |
| 专题 | 寒区旱区环境与工程研究所 |
| 通讯作者 | Wang Gang |
| 作者单位 | 1.Lanzhou Univ, Sch Life Sci, Lanzhou 730000, Peoples R China 2.Chinese Acad Sci, Cold & Arid Reg Environm & Engn Res Inst, Lanzhou 730000, Peoples R China |
| 推荐引用方式 GB/T 7714 | Liu YuBing,Zhang TengGuo,Li XingRong,et al. Protective mechanism of desiccation tolerance in Reaumuria soongorica: Leaf abscission and sucrose accumulation in the stem[J]. SCIENCE IN CHINA SERIES C-LIFE SCIENCES,2007,50(1):15-21. |
| APA | Liu YuBing,Zhang TengGuo,Li XingRong,&Wang Gang.(2007).Protective mechanism of desiccation tolerance in Reaumuria soongorica: Leaf abscission and sucrose accumulation in the stem.SCIENCE IN CHINA SERIES C-LIFE SCIENCES,50(1),15-21. |
| MLA | Liu YuBing,et al."Protective mechanism of desiccation tolerance in Reaumuria soongorica: Leaf abscission and sucrose accumulation in the stem".SCIENCE IN CHINA SERIES C-LIFE SCIENCES 50.1(2007):15-21. |
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来源：寒区旱区环境与工程研究所
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