Abstract
Drought stress is the main growth-limiting factor in pigeon pea production. Plant growth-promoting bacteria (PGPB) induce abiotic stress tolerance in several plants. However, the physiological and molecular changes with PGPB priming are not well understood in pigeon pea. The present study explored the potential of Firmibacteria (Bacillus azotoformans MTCC2953, Bacillus aryabhattai KSBN2K7, and Paenibacillus stellifer M3T4B6) to induce stress tolerance in pigeon pea under pot culture condition. Different physiological and biochemical parameters, including osmolytes, stress enzymes, and antioxidants, were evaluated under two stress conditions (50% and 25% field capacity) and an unstressed condition in pigeon pea. Under moisture stress conditions significant differences were observed in physiological and biochemical parameters between firmibacteria inoculated and control plants.The quantitative real-time polymerase chain reaction was performed to study the bacterial inoculation mediated expression of proline and drought-responsive genes in enhancing the drought tolerance in pigeon pea. Results showed that the inoculation of Bacillus aryabhattai upregulated the expression of drought-responsive genes (C. cajan_29830 and C. cajan_33874) and downregulated the expression of the proline gene by inducing the drought stress tolerance in inoculated plants compared with the uninoculated control plants. Therefore, Bacillus aryabhattai may be recommended for inducing drought stress tolerance and increasing the growth of pigeon pea under moisture stress conditions after field evaluation.
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This work was supported by the Tamil Nadu Agricultural University (TNAU), India.
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Devi, N.S.A., Kumutha, K., Anandham, R. et al. Induction of moisture stress tolerance by Bacillus and Paenibacillus in pigeon pea (Cajanus cajan. L). 3 Biotech 11, 355 (2021). https://doi.org/10.1007/s13205-021-02901-w
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DOI: https://doi.org/10.1007/s13205-021-02901-w