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- W3139473569 abstract "A feature of arbuscular mycorrhiza is enhanced drought tolerance of host plants, although it is unclear whether host H + -ATPase activity and gene expression are involved in the physiological process. The present study aimed to investigate the effects of an arbuscular mycorrhizal fungus (AMF), Funneliformis mosseae , on H + -ATPase activity, and gene expression of trifoliate orange ( Poncirus trifoliata ) seedlings subjected to well-watered (WW) and drought stress (DS), together with the changes in leaf gas exchange, root morphology, soil pH value, and ammonium content. Soil drought treatment dramatically increased H + -ATPase activity of leaf and root, and AMF inoculation further strengthened the increased effect. A plasma membrane (PM) H + -ATPase gene of trifoliate orange, PtAHA2 (MW239123), was cloned. The PtAHA2 expression was induced by mycorrhization in leaves and roots and also up-regulated by drought treatment in leaves of AMF-inoculated seedlings and in roots of AMF- and non-AMF-inoculated seedlings. And, the induced expression of PtAHA2 under mycorrhization was more prominent under DS than under WW. Mycorrhizal plants also showed greater photosynthetic rate, stomatal conductance, intercellular CO 2 concentration, and transpiration rate and better root volume and diameter than non-mycorrhizal plants under DS. AMF inoculation significantly increased leaf and root ammonium content, especially under DS, whereas it dramatically reduced soil pH value. In addition, H + -ATPase activity was significantly positively correlated with ammonium contents in leaves and roots, and root H + -ATPase activity was significantly negatively correlated with soil pH value. Our results concluded that AMF stimulated H + -ATPase activity and PtAHA2 gene expression in response to DS, which resulted in great nutrient (e.g., ammonium) uptake and root growth, as well as low soil pH microenvironment." @default.
- W3139473569 created "2021-03-29" @default.
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- W3139473569 date "2021-03-25" @default.
- W3139473569 modified "2023-10-18" @default.
- W3139473569 title "Arbuscular Mycorrhizal Fungi Alleviate Drought Stress in Trifoliate Orange by Regulating H+-ATPase Activity and Gene Expression" @default.
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- W3139473569 doi "https://doi.org/10.3389/fpls.2021.659694" @default.
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