Ecological adaptation of Populus euphratica to drought stress

doi:10.7522/j.issn.1000-694X.2019.00082

Journal of Desert Research ›› 2020, Vol. 40 ›› Issue (2): 17-23.DOI: 10.7522/j.issn.1000-694X.2019.00082

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Ecological adaptation of Populus euphratica to drought stress

Li Duan^1,2, Si Jianhua¹, Zhang Xiaoyou¹, Gao Yayu^1,2, Luo Huan^1,2, Qin Jie^1,2, Ren Lixin³

1. Key Laboratory of Eco-Hydrology of Inland River Basin, Northwest Institute of Eco-Environment Resources, Chinese Academy of Sciences, Lanzhou 730000, China;
2. University of Chinese Academy of Sciences, Beijing 100049, China;
3. Upstream Hydrology and Water Resources Bureau of Yellow River Conservancy Commission, Lanzhou 730000, China

Received:2019-07-30 Revised:2019-09-27 Online:2020-03-20 Published:2020-04-26

Abstract

Abstract: Pot experiment was designed to compare the ecological adaptability of Populus euphratica under different drought stress by using two-year old seedlings. The results showed: as for the whole plant, with the increase of drought stress, the water conductance of whole shoots and leaves increased, and P. euphratica could absorb and transmit water effectively in arid environment by increasing the hydraulic conductance. At the same time, P. euphratica could maintain water use ability by increasing water use efficiency under drought stress. At the cellular level, P. euphratica maintained osmotic adjustment by accumulating biological enzymes and proline, and the effect of proline provided continuous protection. P. euphratica formed an adaptive water storage and water retention structure with the increase of leaf thickness and palisade tissue thickness. As a result, the effective maintenance of water was formed. In the face of drought stress, P. euphratica made a series of adjustments from micro to macro to form an adaptive system, which was effective in absorption and transmission, maintenance and utilization of water. The study of drought adaptability in P. euphratica is vitial to the restoration and reconstruction of ecosystem in the lower reaches of the Heihe River.

Key words: Populus euphratica, drought, hydraulic conductance, WUE, water maintenance

CLC Number:

Q945.78

Li Duan, Si Jianhua, Zhang Xiaoyou, Gao Yayu, Luo Huan, Qin Jie, Ren Lixin. Ecological adaptation of Populus euphratica to drought stress[J]. Journal of Desert Research, 2020, 40(2): 17-23.

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Ecological adaptation of Populus euphratica to drought stress

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