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Open AccessArticle

Isolation, Identification and Characterization of Rhizobacteria Strains for Biological Control of Bacterial Wilt (Ralstonia solanacearum) of Eggplant in China

1
State Key Laboratory of Rice Biology, Ministry of Agriculture, Key Lab of Molecular Biology of Crop Pathogens and Insects, Institute of Biotechnology, Zhejiang University, Hangzhou 310058, China
2
Plant Protection, Agriculture Directorate, Maysan province, AL-amarah 62001, Iraq
3
Plant Protection, College of Agriculture, University of Misan, AL-amarah 62001, Iraq
*
Author to whom correspondence should be addressed.
Agriculture 2020, 10(2), 37; https://doi.org/10.3390/agriculture10020037
Received: 9 December 2019 / Revised: 3 February 2020 / Accepted: 3 February 2020 / Published: 6 February 2020
Bacterial wilt of eggplant is the most destructive disease caused by Ralstonia solanacearum throughout the world. Eleven bacterial strains with high antagonistic activity were obtained from 245 rhizobacteria. Based on analysis of morphology, 16S rRNA sequences, fatty acid profiles, gyrA and rpoB genes, they were identified as Pseudomonas putida (IMA3), Paenibacillus polymyxa (IMA5), Bacillus cereus (IMA4, IMA7 and IMA11) and the “operational group Bacillus amyloliquefaciens” (IMA1, IMA2, IMA6, IMA8, IMA9 and IMA10). The lipopeptide compounds produced by each strain also were determined. The biocontrol tests demonstrated that co-inoculation by strain IMA5 and the pathogen gave the greatest biocontrol efficiency of 87.0% and 69.2% 30 and 40 days after co-inoculation, respectively. Plant growth promotion tests revealed that IMA5 markedly promoted eggplant growth, enhancing aboveground seedling length and biomass by 60.8% and by 107.6% and underground root length and biomass by 33.0% and 69.2%, respectively. Hence, strain IMA5 could be considered for developing potential biocontrol agents and for promoting plant growth characteristics, to aid the management of the pathogen R. solanacearum in eggplants.
Keywords: lipopeptides; antagonism; plant growth promoter; phylogenetic analyses lipopeptides; antagonism; plant growth promoter; phylogenetic analyses
MDPI and ACS Style

Abd Alamer, I.S.; Tomah, A.A.; Li, B.; Zhang, J.-Z. Isolation, Identification and Characterization of Rhizobacteria Strains for Biological Control of Bacterial Wilt (Ralstonia solanacearum) of Eggplant in China. Agriculture 2020, 10, 37.

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