Abstract
Aims
The function of indigenous mycorrhizal fungi in improving crop growth is not well addressed because of methodological limitations. In this study, we determined the effects of the indigenous arbuscular mycorrhizal (AM) fungal community on the growth responses and salt tolerance of cotton and maize.
Methods
Through a 2-year field trial with in-growth microcosms constructed by polyvinylchloride (PVC) tube cores and 30-μm nylon mesh that were buried in different saline soils, two core treatments, static (freely allowed AM fungal colonization) and vibrating (patting the top core edge twice every day to break any extraradical hyphae that intends to access into the core to reduce AM fungal colonization), were applied in field conditions.
Results
The results showed that vibration did not affect the growth of the control non-mycorrhizal plant, sugar beet, but significantly affected the growth of the mycorrhizal plants, cotton and maize. These data indicated that such core systems could provide a reliable method to quantify the functions of the AM fungal community in situ. Mycorrhizal colonization of cotton and maize significantly declined in the vibrating treatment compared to the static treatment. Phosphorus (P) uptake and biomass production of cotton and maize were significantly higher in the static than the vibrating. The indigenous AM fungal community promoted leaf proline accumulation in cotton and a higher K+/Na+ ratio via selective preferential uptake of K+ over Na+. These effects and enhanced P uptake derived from AM fungi were related to alleviating salt stress and promoted the growth of cotton and maize in saline soils.
Conclusions
Our results demonstrated that indigenous AM fungi play a role in improving crop growth by alleviating the harmful effects of high salinity in intensified cropping systems.
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Acknowledgments
This study was supported by the National Science Foundation of China (U1403285, 41461051), the Special Fund for Agro-scientific Research in the Public Interest (201103007) and the Innovative Group Grant of the National Science Foundation of China (31421092).
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Highlights
• We quantified the role of indigenous AM fungi in promoting crop growth in saline field.
• AM fungi improved P uptake, Na+/K+ ratio, proline or/and soluble sugar accumulation.
• Indigenous AM fungi alleviate high salinity stress of crop in intensified farming system.
• The in-growth core system was modified using a non-mycorrhizal plant species Beta vulgaris.
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Liu, S., Guo, X., Feng, G. et al. Indigenous arbuscular mycorrhizal fungi can alleviate salt stress and promote growth of cotton and maize in saline fields. Plant Soil 398, 195–206 (2016). https://doi.org/10.1007/s11104-015-2656-5
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DOI: https://doi.org/10.1007/s11104-015-2656-5