数字农科院2.0

Alleviation of the detrimental effect of water deficit on wheat (Triticum aestivum L.) growth by an indole acetic acid-producing endophytic fungus

文献类型： 外文期刊

作者： Xiaojing Qiang ;; Junjun Ding ;; Wei Lin ;;Qiaozhen Li;; Chunying Xu ;; Qian Zheng;;Yuzhong Li

关键词： Endophytic fungi . Drought stress . IAA.Wheat . Physiology parameters

期刊名称： Plant and Soil

ISSN： 00332-079X

年卷期： 2019 年 第439卷 卷 第439期 期

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摘要： Background and aims Endophytic fungi colonization is an eco-friendly strategy to respond to environmental stresses and onfer tolerance to the host plant. Here, the responses of wheat plant inoculated with an indole acetic acid (IAA) -producing endophytic fungus to drought stress and water recovery were evaluated. Methods The inoculation of wheat plants with Alternaria alternata (LQ1230) was conducted to evaluatedrought resistance under adequate water, water deficit and water recovery conditions by examining the growth parameters and various hysiological indicators of wheat seedlings. Results The LQ1230 isolated from Elymus dahuricus Turcz could secrete indole acetic acid (IAA) by both the tryptophan-dependent (319.24 ± 14.88 μg/mL) and independent (40.12 ± 8.59 μg/mL) pathways. LQ1230 inoculation enhanced wheat growth and drought tolerance through regulation of antioxidant enzyme activities and the content of compatible solutes such as soluble sugars and proline. Additionally, LQ1230 inoculated plants demonstrated significantly improved otosynthesis, C and N accumulation of wheat plants, leading to a positive relationship with plant dry biomass under water deficit and re-watering conditions. Conclusions We found that the improved wheat plant growth, photosynthesis and nutrient accumulations by the noculation of Alternaria alternata LQ1230 might be attributed to the reprogramming of wheat plant metabolism, thus enhancing wheat drought tolerance. Inoculation with fungal endophytes such as LQ1230 has the potential to increase crop drought resistance.

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