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Effects of two Glomus species on the growth and physiological performance of Sophora davidii seedlings under water stress

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Abstract

Sophora davidii is an important leguminous scrub that is widely used for revegetation in the semiarid Loess Plateau and other arid valley areas of China, where it usually suffers drought stress. This study investigated the effects of arbuscular mycorrhizal (AM) fungi (Glomus mosseae and Glomus constrictum) and water stress on the growth and physiological performance of S. davidii seedlings under greenhouse pot conditions. Two soil water availability treatments (well-watered (WW) −0.10 MPa; water-stressed (WS) −0.86 MPa) were applied for 61 days. At the end of this experiment, G. mosseae and G. constrictum had colonized the roots of S. davidii seedlings. Water stress inhibited AM colonization, plant growth, chlorophyll concentration, gas exchange and chlorophyll fluorescence of S. davidii seedlings. Mycorrhizal seedlings had greater shoot dry weight, root dry weight, plant height, root length, instantaneous water use efficiency (iWUE), net photosynthetic rate (Pn), stomatal conductance (gs), maximal photochemical efficiency of PSII photochemistry (Fv/Fm), lower intercellular CO2 concentration and photochemical quenching values (qP), when compared with non-mycorrhizal seedlings under both WW and WS conditions. Furthermore, G. constrictum was found to be more efficient at improving the shoot and root mass, plant height, iWUE, Pn, gs, qP, and ΦPSII of S. davidii seedlings, when compared with G. mosseae under both WW and WS conditions. Our results demonstrate that AM Glomus symbiosis enhanced S. davidii seedling resistance by improving its growth and physiological performance under water stress conditions. This suggests that Glomus inoculation is a potential tool for enhancing outplanting performance of S. davidii in semiarid areas of China.

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Acknowledgments

This study was funded by the Key Project of the National Natural Science Foundation of China (30730073, 31170567), the Program for Changjiang Scholars and Innovative Research Team in the University of China (IRT1035) and the Doctoral Program of Higher Education of China (20100204110033, 20110204130001). We also thank anonymous reviewers for their valuable suggestion to enhance the manuscript and Dr Duncan E. Jackson for improving the English language used in this manuscript.

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Correspondence to Ming Tang.

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Gong, M., Tang, M., Chen, H. et al. Effects of two Glomus species on the growth and physiological performance of Sophora davidii seedlings under water stress. New Forests 44, 399–408 (2013). https://doi.org/10.1007/s11056-012-9349-1

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  • DOI: https://doi.org/10.1007/s11056-012-9349-1

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