Potential of Bacillus spp. as a biocontrol agent for antrachnose fruit rot of chilli

Sariah Meon, . Potential of Bacillus spp. as a biocontrol agent for antrachnose fruit rot of chilli. pp. 53-60. ISSN 0126-8643

An isolate of Bacillus subtilis from chilli fruits and seeds inhibited in vitro growth and conidial germination of Colletotrichum capsici and Colletotrichum gloeosporioides the causal agent of anthracnose ripe rot of chilli. On potato-dextrose agar the bacterium induced 64.6 and 67.2 inhibition in mycelial growth of C. capsici and C. gloeosporioides respectively. Total inhibition in conidial germination was noted for both fungi in the presence of the bacterium 24 hr after treatment. Aqueous culture filtrate of B. subtilis also inhibited growth and germination of Colletotrichum spp. thus suggesting that an antibiotic substance(s) may be produced by the bacterium. Malformation of hyphae occurred in the presence of the bacterium or aqueous culture filtrate. Hyphae were thickened vacuolar and many swellings occurred in or at the tips of hyphal strands. Spraying a suspension of the bacterium or the aqueous culture filtrate onto detached chilli fruits before inoculation with conidia of either C. capsici or C. gloeosporioides significantly reduced infection and lesion development as compared with the unsprayed inoculated control. Results suggest that once the specific strain of B. subtilis is established on the chilli fruits it may help to protect the fruit from infection by anthracnose fungi

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Abstract

An isolate of Bacillus subtilis from chilli fruits and seeds inhibited in vitro growth and conidial germination of Colletotrichum capsici and Colletotrichum gloeosporioides the causal agent of anthracnose ripe rot of chilli. On potato-dextrose agar the bacterium induced 64.6 and 67.2 inhibition in mycelial growth of C. capsici and C. gloeosporioides respectively. Total inhibition in conidial germination was noted for both fungi in the presence of the bacterium 24 hr after treatment. Aqueous culture filtrate of B. subtilis also inhibited growth and germination of Colletotrichum spp. thus suggesting that an antibiotic substance(s) may be produced by the bacterium. Malformation of hyphae occurred in the presence of the bacterium or aqueous culture filtrate. Hyphae were thickened vacuolar and many swellings occurred in or at the tips of hyphal strands. Spraying a suspension of the bacterium or the aqueous culture filtrate onto detached chilli fruits before inoculation with conidia of either C. capsici or C. gloeosporioides significantly reduced infection and lesion development as compared with the unsprayed inoculated control. Results suggest that once the specific strain of B. subtilis is established on the chilli fruits it may help to protect the fruit from infection by anthracnose fungi

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Item Type:	Article
Additional Information:	Summary (En Ms)
AGROVOC Term:	CAPSICUM ANNUUM
AGROVOC Term:	EXPERIMENTACION IN VITRO
AGROVOC Term:	BACILLUS SUBTILIS
AGROVOC Term:	ANTAGONISMO
AGROVOC Term:	COLLETOTRICHUM
AGROVOC Term:	COLLETOTRICHUM GLOEOSPORIOIDES
AGROVOC Term:	ANTRACNOSIS
AGROVOC Term:	GUINDILLA
Depositing User:	Ms. Norfaezah Khomsan
Last Modified:	24 Apr 2025 05:57
URI:	http://webagris.upm.edu.my/id/eprint/20982

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