Insights into the core bacterial consortia of root endophytes in two cultivated varieties of rice in West Bengal
DOI:
https://doi.org/10.22364/eeb.20.19Keywords:
bacterial diversity, metagenome, microbial consortia, plant growth, rice root endophytesAbstract
Root endophytes are considered to be one of the potent environment-friendly substitutes for chemical fertilizers, as they possess an ability to induce crosstalk inside the hosts for growth promotion, nitrogen fixation, phosphate solubilization and iron sequestration. This study aimed to explore and evaluate the key root endophytic bacterial consortia of two widely cultivated varieties of rice (Oryza sativa L.), cv. ‘Saraswati’ (OS01) and cv. ‘Kunti’ (OS04). Detailed comparative metagenome data were generated for endophytes of OS01 and OS04 and the species richness was calculated. OS01 showed higher endophyte species richness than OS04, with alpha diversity values of 3.10 and 2.40, respectively. Bacillus, Magnetospirillum, Methanocystis, Desulfomicrobium and Pantoea were identified as common endophyte members for both cultivars. Solibacillus, Paenibacillus, Candidatus, and Melospira were unique members of OS01, and Herbaspirillum, Pandoraea, Anabaenopsis for OS04. Considerable occurrence of nitrogen fixing bacteria and methanogenic bacteria in the cultivars confirmed biological nitrogen fixation, which can contribute to plant development. Core homeotic pathways of amino acid biosynthesis and carbon metabolism were also reflected in endophytes from both cultivars, indicating a supportive environment for microorganisms. Sulfur metabolism pathways were likewise predicted to be active in the niche under study, which may be attributed as a response to arsenic stress. Furthermore, the most abundant genera identified may potentially serve as crucial consortium candidates for host plant development and contribute to better yield in a sustainable manner.
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