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Acta Prataculturae Sinica ›› 2021, Vol. 30 ›› Issue (5): 211-220.DOI: 10.11686/cyxb2020213

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Allelopathic effect of root extracts from Astragalus strictus seedlings on eight wild plants of Tibet

Sai Hen-na BAO1(), Xiang-tao WANG1, Jun-xi WU2, Yan-jun MIAO1(), Xiang JIA1, Yan-ting TIAN1   

  1. 1.Tibet Agriculture and Animal Husbandry College,Nyingchi 860000,China
    2.Institute of Geographic Sciences and Natural Resources Research,Chinese Academy of Sciences,Beijing 100101,China
  • Received:2020-05-12 Revised:2020-07-29 Online:2021-05-20 Published:2021-04-16
  • Contact: Yan-jun MIAO

Abstract:

We investigated the allelopathic effect of an extract of Astragalus strictus root tissues on the following wild plants of Tibet: Medicago lupulina Elymus nutans Oxytropis microphylla Festuca ovina Stipa purpurea Stipa capillacea Kobresia littledaleiand Eragrostis nigra. An aqueous extract from roots of A. strictus was applied at different concentrations (0.1, 0.05, 0.025, 0.0125 g·mL-1) to seeds of the eight plant species, and its effects on seed germination and seedling growth were determined. We detected significant (P<0.05) allelopathic effects of the extract on the germination rate, germination vigor, germination index, vigor index, root length, seedling height, and dry weight of seedlings and roots. There were some differences in responses among the eight tested wild plants. Notably, the root extract significantly (SE>0) accelerated the seed germination and growth of M. lupulina O. microphylla, and F. ovina; It had inhibitory effects on E. nutans and S. purpurea SE<0); And it had no obvious effect on S. capillacea and E. nigra. We calculated the average plant sensitivity index to analyze the allelopathic effect of the A. strictus root extract on the seed germination and growth of the eight wild plants. The plants were ranked, from most to least sensitive to the allelopathic effects of the A. strictus root extract, as follows: E. nutans>S. purpurea>S. capillacea. The remaining plants were ranked from strongest to weakest growth-promoting effects of root extract of A. strictusas follows: O. microphylla>K. littledalei>E. nigra>F. ovina>M. lupulina.

Key words: Astragalus strictus, allelopathy, several plants in Tibet, seed germination and growth, suppression rate, allelopathic index