Identification and role of organic acids in watermelon root exudates for recruiting Paenibacillus polymyxa SQR-21 in the rhizosphere
By N. Ling, Waseem Raza, Jinghua Ma, Qiwei Huang, Q. Shen. 2011
158 citations recorded by the source corpus.
Abstract Paenibacillus polymyxa can serve as a biocontrol agent with a broad host range, but knowledge of the possible contribution of root exudates to its colonization of the rhizosphere remains limited. In this experiment, we identified several organic acids in the root exudates of watermelon. Chemotaxis and swarming assays were performed to investigate the ability of these organic acids to induce the motility of P. polymyxa SQR-21. Oxalic acid, malic acid and citric acid were present in the root exudates but only the intermediate products in tricarboxylic acid cycle, i.e., malic acid and citric acid, could significantly induce motility in P. polymyxa SQR-21. The maximal inducing ability was obtained with malic acid. Values for malic acid were 3.9 and 1.5 times higher than the control in the chemotaxis assay and the swarming assay, respectively. An in vitro experiment further confirmed that these intermediate products in tricarboxylic acid cycle could promote recruitment to P. polymyxa SQR-21, thereby increasing the population in the rhizosphere. In conclusion, some of the organic acids secreted by roots could play an important role in root colonization of SQR-21. This finding contributes to our understanding of the interactions of bacteria and plants under natural conditions.
Subfields: Plant Science
View Paper: https://www.semanticscholar.org/paper/d4a24761b9740591da40a902a4590eb5d4081539
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Citations in the corpus
- Production of volatile organic compounds by an antagonistic strain Paenibacillus polymyxa WR-2 in the presence of root exudates and organic fertilizer and their antifungal activity against Fusarium oxysporum f. sp. niveum (2015, methodology): “The root exudates recruit beneficial rhizobacteria and sustain their growth by providing them nutrition in the rhizosphere (Badri and Vivanco, 2009; Ling et al., 2011).”
- Impact of plant domestication on rhizosphere microbiome assembly and functions (2015, background): “Malic acid and citric acid exuded by watermelon roots were shown to induce motility and root colonization by the PGPR Paenibacillus polymyxa SQR21 (Ling et al. 2011).”