3种优良牧草对大狼毒根浸提液的化感耐受性及生理响应

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中图分类号：S452 文献标志码：A 文章编号：1004-390X（2025）05-0117-08

Abstract： [Purpose] To study the allelopathic tolerance and physiological response of three excellent forages to the root extract of Euphorbia jolkini，and to provide a basis for the selection of excellent grass species for reseeding and management of degraded mountain meadows in northwest Yunnan. [Methods] The root extract of E jolkinii was used as donor material， and three excellent forages （including Lolium perenne，Arundinela hookeri and Trifolium repens） suitable for reseeding and management of mountain meadows in northwest Yunnan were used as recipient materials， the evaluation of allelopathic tolerance to E jolkinii root extract and their physiological responses were carried out. [Results] The root extract of E jolkinii showed significant allelopathic inhibitory effects on the seedlings growth， root vitality，the content of chlorophyll a， chlorophyllb and carotenoid， and the synthesis of gibberellin， zeatin，salicylic acid and jasmonic acid of three forages. The alelopathic tolerance of T. repens was strongest， followed by L perenne，and the lowest in A. hookeri.Moreover， the inhibitory effect increased with the increase of mass concentration of extract.To resist alelopathic stress， the recipient plants increased soluble sugar and malondialdehyde content， antioxidant enzyme activity and abscisic acid biosynthesis to resist the adverse environment， enhancing its own resistance.

[Conclusion] The allelopathic effect of E jolkinii is strong. In the mountain meadows with low and medium coverage of E .jolkinii， it is recommended to use the allelopathic tolerant species such as T. （204号 repens and L . perenne for reseeding and management.

Keywords： Euphorbia jolkini; seedling growth; endogenous hormones; allelopathic effect; reseeding; degraded grassland

中国是世界上草地资源最丰富的国家之一，草原面积约占国土面积的 40% ，提供了巨大的生态和经济价值。（剩余10684字）