Rhizobacteria Bacillus spp. induce resistance against anthracnose disease in chili (Capsicum annuum L.) through activating host defense response

Naveen, J. and Navya, H. M. and Hariprasad, P. and Hithamani, G. and Niranjana, S. R. (2019) Rhizobacteria Bacillus spp. induce resistance against anthracnose disease in chili (Capsicum annuum L.) through activating host defense response. Egyptian Journal of Biological Pest Control, 29 (1). ISSN 1110-1768

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Abstract

Bacillus sp. BSp.3/aM, a beneficial rhizobacteria, was analyzed for the ability to improve plant health of chili by suppressing anthracnose disease. In the dual culture assay, the bacterium Bacillus sp. BSp.3/aM was found inhibitory to Colletotrichum capsica (6 mm). Further, upon seed priming, it reduced the seed-borne incidence of C. capsici (2%) and improved seedling vigor (1374 ± 7.15 vigor index) and germination (98 ± 0.57 %) of chili seedlings. Under greenhouse conditions, seed priming resulted in reducing the anthracnose disease incidence up to 20%. Induction of resistance against invading pathogen is through enhancing the activities of defense-related enzymes and higher accumulation of phenolic compounds in the host plant. The activity of phenylalanine ammonia-lyase (PAL; 95 units) was more at 48 hpi; peroxidase (POX; 6.49 units) at 24 hpi; polyphenol oxidase (PPO; 5.81 units) at 24 hpi and lipoxygenase (LOX; 9.9units) at 24 hpi. Maximum accumulation of the phenolics and chitinase accumulation was observed in BSp.3/aM + pathogen treated seedlings 120 hpi (94.7 μg/g tissue) and at 96 hpi (9.36 units), respectively. Thus, increased activities of defense-related enzymes (PAL, POX, PPO, LOX, and chitinase) correlated well with the decreased anthracnose incidence. Induced systemic resistance (ISR) mediated by PGPR was due to the upregulation of defense-related enzymes and by the accumulation of phenolic compounds.

Item Type:	Article
Uncontrolled Keywords:	Anthracnose; Biocontrol; Chili; Colletotrichum capsici; Defense-related enzymes (PAL; LOX); POX; PPO; Rhizobacteria
Subjects:	B Life Science > Biotechnology
Divisions:	Department of > Biotechnology
Depositing User:	C Swapna Library Assistant
Date Deposited:	20 Nov 2025 07:14
Last Modified:	20 Nov 2025 07:14
URI:	http://eprints.uni-mysore.ac.in/id/eprint/17941

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