首页|Eco-physiological mechanisms of Caragana korshinskii Kom.adaptation to extreme drought stress: Leaf abscission and maintaining stem chloroplast integrity

Eco-physiological mechanisms of Caragana korshinskii Kom.adaptation to extreme drought stress: Leaf abscission and maintaining stem chloroplast integrity

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In order to study the eco-physiological mechanisms of C.korshinskii adaptation to extreme drought stress,we investigated the variations of water content in soil,leaves,and stems,the chlorophyll a and b and the carotenoid content in leaves and stems,as well as changes of chloroplast ultrastructure in 2-year-old C.korshinskii specimens during a progressive soil drought process (by ceasing watering until all leaves were shed) and a subsequent rehydration process.During the dehydration process,the chlorophyll a and b and carotenoid contents in the leaves decreased,as did the carotenoid content in the stems.During the 4-day rehydration process,the chlorophyll a and b and carotenoid contents in the leaves and stems increased and gradually returned to normal levels.During ongoing drought stress,chloroplasts in the leaves broke away from cell walls and appeared in the center of cells.Under severe drought stress,the mesophyll ultrastructure and chloroplast configuration in leaves were irreversibly disturbed,as manifested by the inner and outer membranes being destroyed; the thylakoid system disintegrated,the starch grain disappeared,and parts of cell tissue were dismantled into debris.However,the mesophyll ultrastructure and chloroplast configuration in the stems remained complete.This indicates that C.korshinskii utilizes leaf abscission to reduce the surface area to avoid damage from extreme drought stress,and maintains chloroplast integrity and a considerable amount of chlorophyll to enable a rapid recovery of photosynthesis under the rehydration process.

Caragana korshinskiiextreme drought stressleaf abscissionchloroplast ultrastructure

DangHui Xu、XiangWen Fang、ZhenJun Bin、Gang Wang、PeiXi Su

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State Key Laboratory of Grassland Agro-ecosystems/School of Life Science, Lanzhou University, Lanzhou, Gansu 730000,China

Cold and Arid Regions Environmental and Engineering Research Institute, Chinese Academy of Sciences, Lanzhou, Gansu 730000, China

National Natural Sciences Foundation of ChinaNational Natural Sciences Foundation of ChinaChina Postdoctoral Science Foundation

309001719102502620090450186

2012

10.3724/SP.J.1226.2012.00498

寒旱区科学(英文版)
中国科学院寒区旱区环境与工程研究所,科学出版社有限责任公司

寒旱区科学(英文版)

CSCD
影响因子：0.237
ISSN：1674-3822
年,卷(期)：2012.4(6)
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