Comparison of drought resistance among three Calligonum in the Southern Fringe of the Taklamakan Desert

doi:10.11686/cyxb20140315

Abstract

Abstract: The influence of drought stress and re-watering on the ecophysiological characteristics of Calligonum cancellatum, C. cordatum, and C. rubicundun was studied in a pot experiment under three irrigation treatments. The comprehensive drought resistance of the three Calligonum was compared with their subordinate function. Under water stress, relative water content, water potential, and chlorophyll content of assimilating branches were higher for C. rubicundun, but recovered more slowly after re-watering compared with those of other species. After water stress, the malondialdehyde (MDA) content was lower and recovered more slowly for C. rubicundun under drought and medium irrigation treatments, but was higher and recovered more quickly at high irrigation levels compared with other species. There was a large number of osmotic adjustment substances (soluble sugar and proline) accumulated in the assimilating branches of the three Calligonum under water stress. The contents of osmotic adjustment substances under drought treatment were in the following order: C. cordatum>C. rubicundun>C. cancellatum, but under medium and high irrigation treatments they were C. cancellatum>C. cordatum>C. rubicundun. However, the contents of osmotic adjustment substances in C. cordatum decreased more significantly compared to other species after re-watering. In addition, C. cordatum had significantly higher root/shoot ratios than the other species. Based on the determined indexes under water stress, the comprehensive drought resistance was in the following order: C. rubicundun>C. cancellatum>C. cordatum. Obviously, the difference of each ecophysiological parameter among species was not consistent with that of comprehensive evaluation. Overall, C. rubicundun can be introduced for shelterbelt construction because of its strong tolerance and adaptability to drought stress in the southern fringe of the Taklimakan Desert.

CLC Number:

S793.102

HUANG Cai-bian,ZENG Fan-jiang,LEI Jia-qiang. Comparison of drought resistance among three Calligonum in the Southern Fringe of the Taklamakan Desert[J]. Acta Prataculturae Sinica, 2014, 23(3): 136-143.

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