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Assessment of Methylobacterium oryzae CBMB20 aggregates for salt tolerance and plant growth promoting characteristics for bio-inoculant development

机译：米曲霉CBMB20聚集体对耐盐性和促进植物生长的特性的评估用于生物接种剂的开发

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Salinity is one of the major factors contributing to the loss of crop productivity and thereby impacting livelihood of people in more than 100 countries of the world and the area of land affected by salinity is increasing day by day. This will worsen due to various factors such as drought that might result in high soil salinity. Use of plant growth promoting rhizobacteria is one of the promising eco-friendly strategies for salinity stress management as part of sustainable agricultural practices. However, it requires selecting rhizobacteria with good survivability and adaptation to salt stress. In this study we report aggregation of Methylobacterium oryzae CBMB20 cells grown in media containing high C/N ratio (30:1) than in media containing low C/N ratio (7:1). Aggregated Methylobacterium oryzae CBMB20 cells exhibited enhanced tolerance to UV irradiation, heat, desiccation, different temperature regimes, oxidative stress, starvation and supported higher population in media. Poly-β-hydroxybutyrate accumulation, exopolysaccharide production, proline accumulation and biofilm formation were good at 100 mM salt concentration with good microbial cell hydrophobicity at both 50 and 100 mM than other concentrations. Both the aggregated and non-aggregated cells grown under 0–200 mM salt concentrations produced IAA even at 200 mM salt concentration with a peak at 100 mM concentration with aggregated cells producing significantly higher quantities. ACC deaminase activity was observed in all NaCl concentrations studied with gradual and drastic reduction in aggregated and non-aggregated cells over increased salt concentrations.
机译：盐分是造成作物生产力下降并因此影响世界100多个国家人民生活的主要因素之一，受盐分影响的土地面积每天都在增加。由于各种因素（例如干旱，可能导致高土壤盐分），这种情况将恶化。作为可持续农业实践的一部分，使用促进根瘤菌的植物生长是盐分胁迫管理的有希望的生态友好策略之一。但是，它需要选择具有良好生存能力并适应盐胁迫的根瘤菌。在这项研究中，我们报道了在含有高C / N比（30：1）的培养基中比在含有低C / N比（7：1）的培养基中生长的米曲霉CBMB20细胞的聚集。聚合的米曲霉CBMB20细胞显示出对紫外线辐射，热，干燥，不同温度模式，氧化应激，饥饿的增强的耐受性，并支持较高的培养基种群。食盐浓度为100mM时，聚-β-羟基丁酸酯的积累，胞外多糖的产生，脯氨酸的积累和生物膜的形成均优于其他浓度，在50和100mM时微生物细胞疏水性都很好。在0-200 mM盐浓度下生长的聚集细胞和非聚集细胞均会产生IAA，即使在200 mM盐浓度下也是如此，在100 mM浓度时达到峰值，而聚集细胞产生的数量明显更高。在所研究的所有NaCl浓度下均观察到ACC脱氨酶活性，随着盐浓度的增加，聚集和非聚集细胞逐渐减少。

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