Physiological-ecological responses of twelve herbaceous plant species under drought stress and evaluation of their drought resistance when planted in coal producting basis in arid windy and sandy areas

doi:10.11686/cyxb2020114

Abstract

Abstract: This research aimed to identify herbaceous plant species which are suitable for vegetation restoration and construction in coal producting basis in arid wind and sand areas, we studied the effects of drought stress on functional traits, photosynthetic characteristics and antioxidase activities of twelve herbaceous plant species grown in pots. The tested plant species were: Limonium bicolor, Agropyron mongolicum, Agropyron desertorum, Astragalus adsurgens, Mellilotus officinalis, Trifolium repens, Medicago sativa, Glycyrrhiza uralensis, Artemisia ordosica, Suaeda glauca, Althaea rosea, and Agriophyllum squarrosum. It was found that at low soil water content, the plant height, specific leaf area, leaf dry matter content, leaf relative water content and root:shoot ratios of all species were affected by the drought stress to some extent, and most species were significantly affected after 14 days of drought stress. Compared with the control treatment, the net photosynthetic rate, stomal conductance and transpiration rate decreased and the activities of superoxide dismutase, catalase, and malondialdehyde (MDA) concentration increased among twelve herbaceous plants after 21 days of drought stress. Re-watering after drought stress resulted in partial recovery of superoxide dismutase, and catalase activity. However, there was significant variation in the MDA content of the twelve species after re-watering, and the MDA content of A. mongolicum, A. desertorum, A. adsurgens and M. sativa displayed an upward trend. Evaluation of multiple traits by principal component analysis showed that the functional trait and antioxidase activity data could be used to evaluate the adaptation capacity of the plant species under drought stress because these traits had the largest eigenvector coefficients. The drought resistance of the twelve herbaceous plant species was then evaluated with a multivariate procedure combining principal component analysis and membership function value, and the ranking so obtained was A. ordosica>A. adsurgens>M. officinalis>A. rosea>A. mongolicum>S. glauca>T. repens>M. sativa=G. uralensis>A. desertorum>L. bicolor>A. squarrosum.

Key words: herbaceous plants, drought stress, functional traits, photosynthetic characteristics, antioxidases

XU Ai-yun, CAO Bing, XIE Yun. Physiological-ecological responses of twelve herbaceous plant species under drought stress and evaluation of their drought resistance when planted in coal producting basis in arid windy and sandy areas[J]. Acta Prataculturae Sinica, 2020, 29(10): 22-34.

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