Abstract
Microorganisms and their hosts communicate through an array of signals. Many physiological processes regulated in quorum sensing (QS) are dependent on auto-inducers, like N-acyl-homoserine lactones (AHLs) as in numerous groups of both gram-positive and gram-negative bacteria. In vitro grown seven-day old chickpea seedlings treated with plant growth promoting bacteria (PGPRs) were used to screen the AHL mimicking and for phytochemical substances like phytohormones and secondary metabolites such as phenolics and flavonoids. Potential anti-quorum sensing (anti-QS) activity surrounding the roots on semi-solid agar lawn of Chromobacterium violaceum (ATCC12742) was observed. Crude protein (4.46–8.30 μg/mL) and methanolic extracts (100 μg/mL) of seedling gave moderate anti-QS activity against CV12742 anti QS bioassay, respectively. Crude protein and methanolic extract of Bacillus amyloliquefaciens (34.00 ± 2.23; 34.00 ± 4.33 mm) and B. subtilis A (27.00 ± 2.10; 3.29 ± 2.16 mm) treated samples showed higher zone of inhibition due to anti-QS activity. Phytohormone analysis using LC–MS for zeatin, auxin and methyl jasmonate (MeJA) indicated that phytohormones were significantly upregulated by 1909.80 ng/g FW, 669.67 ng/g FW and 244.55 ng/g FW, respectively in Pseudomonas brassicacearum treated seedlings compared to control. UHPLC of PGPR treated seedlings showed overly expressed gallic acid, protocatechuic acid, catechin, p-hydroxybenzoic acid, caffeic acid, catechol, vanillin, and ferulic acid in B. amyloliquefaciens treated seedlings compared to others. Enrichment analysis identified significant pathways related to metabolism, biosynthesis of secondary metabolites. The present study indicates that chickpea neutralizes an extensive range of functional responses to AHLs that may play important role in legume host-microbe interactions.
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Ms. Anamika Saral acknowledge Department of Biotechnology (DBT), Govt. of India, New Delhi and to the Secretary and Joint Secretary, DBT for sanction of sabbatical leave for submission of Ph.D. thesis and financial support. Dr. Rekha Punchappady-Devasya, Deputy Director at Yenepoya Research Centre, Mangalore (Karnataka) is duly acknowledged for providing research facility for anti-quorum sensing activity.
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Saral, A., Kanekar, S., Koul, K.K. et al. Plant growth promoting bacteria induce anti-quorum-sensing substances in chickpea legume seedling bioassay. Physiol Mol Biol Plants 27, 1577–1595 (2021). https://doi.org/10.1007/s12298-021-01034-x
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DOI: https://doi.org/10.1007/s12298-021-01034-x