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Authors: Qin, Sheng and Feng, Wei-Wei and Wang, Tian-Tian and Ding, Peng and Xing, Ke and Jiang, Ji-Hong

Background and aims: Soil salinity is a worldwide environmental problem that can hinder plant development and therefore negatively impact crop production. Inoculation of halophytic plants with plant growth-promoting (PGP) actinobacteria has been suggested as one strategy to improve salt tolerance. Here we performed a glasshouse experiment to test the effect of a PGP halotolerant endophytic actinomycete strain, KLBMP 5084 on the performance of the halophyte Limonium sinense under conditions of salt stress. Methods: Strain KLBMP 5084 was identified and screened for multiple PGP traits. The complete genome of strain KLBMP 5084 was sequenced and analyzed. L. sinense control seedlings (no inoculation) and seedlings inoculated with KLBMP 5084 were given different NaCl (0, 100 and 250 mM) salt-stress treatments. Growth parameters and physiological responses of L. sinense were determined after harvest. Results: Compared with the control, plants inoculated with strain KLBMP 5084 had greater in fresh weight, root length, leaf length and total chlorophyll and proline contents under both normal and high salinity conditions. Compared with control, inoculated plants had significantly lower leaf malondialdehyde (MDA) content and significantly more antioxidant enzymes. Moreover, inoculated plants had significantly lower accumulation of Na+ in both leaves and roots under high salt-stress conditions. Genomic analysis of strain KLBMP 5084 revealed many PGP related genes, including some genes putatively involved in salt tolerance and harsh environment adaptation. Conclusion: Strain KLBMP 5084 seems to confer salt tolerance to host plant L. sinense through more than one mechanism, suggesting KLBMP 5084 could be a strong PGP agent to improve plant yields and tolerance to salinity stress.

Journal: Plant and soil
DOI: 10.1007/s11104-017-3192-2
Year: 2017

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