Abstract
Endophytic bacterial diversity in four rice cultivars grown in two soil-types, their plant-probiotic features and rhizospheric deployment under P-stress were investigated. Oryza sativa cvs. TCN1, TCS10, TK8, and TN71 were cultivated in greenhouse using non-sterile acidic and near-neutral paddy soils for 60 days. Root, stem and leaf tissues were screened for culturable bacterial endophytes using nutrient agar. Endophytes were identified and profiled for plant-probiotic features. The richness, Shannon-Weiner diversity, evenness and Venn’s distribution in terms of endophytic strains were evaluated. Seed-borne endophytes were characterized through DGGE. The deployment of endophytes into the rhizosphere in TCN1 and TK8 under gnotobiotic P-stress was assessed. A total of 52 distinct endophytic bacterial strains affiliated to 5 classes and 20 discrete genera exhibiting differential plant-probiotic features were isolated from various tissues of four different rice cultivars. The diversity and distribution of endophytes fluctuated with soil-type, tissue-type and rice genotype. Gnotobiotic insoluble P treatment revealed significantly enhanced deployment of P-solubilizing rhizobacteria in TCN1 as compared to soluble P and P-lacking control. Rice endophytic bacteria are diverse, and their distribution within the plant and deployment as rhizobacteria were found to be influenced by host genotype, edaphic factors and nutrient stress.
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