Malaysian Applied Biology Journal

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49_05_10

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Malays. Appl. Biol. (2020) 49(5): 89–97

 

CONTROL OF GRAY MOLD DISEASE OF TOMATO CAUSED BY

Botrytis cinerea USING BACTERIAL SECONDARY METABOLITES


ARAFAT HASHIM1, SITI IZERA ISMAIL1, WAEL ALSULTAN1, IDRIS ABU SEMAN2,

OSAMAH RASHED1 and KHAIRULMAZMI AHMAD1,3*


1Department of Plant Protection, Faculty of Agriculture, Universiti Putra Malaysia,

43400 UPM, Serdang, Selangor Darul-Ehsan, Malaysia

2Malaysian Palm Oil Board, 6, Persiaran Institusi, Kawasan Institusi Bangi,

40300 Kajang, Selangor

3Institute of Plantation Studies. Universiti Putra Malaysia, 43400 UPM,

Serdang, Selangor Darul Ehsan, Malaysia

*E-mail: This e-mail address is being protected from spambots. You need JavaScript enabled to view it

 

Accepted 25 October 2020, Published online 31 December 2020

 

ABSTRACT

Gray mold disease is caused by Botrytis cinerea and it is the most significant and devastating disease affecting tomato cultivation worldwide. This disease was recently reported infecting tomato fruits in Cameroon Highland, Pahang. Biocontrol agents have been proven to be effective towards many phytopathogens. In this study, 43 bacterial isolates were screened against B. cinerea in-vitro. Five isolates with more than 65% inhibition of radial growth (PIRG) were selected for the subsequent experiments. Findings in dual culture assay revealed that BM11 and BC4 were the most effective biocontrol agent, with PIRG of 82.5% and 71.8%, respectively. BM11 and BC4 isolates were identified using the 16S rDNA gene. The identification results found that BM11 and BC4 were Pseudomonas protegens and Brevibacterium casei, respectively. Ten major bioactive compounds were successfully identified by Gas chromatography-mass spectrometry (GC-MS) from the culture filtrate of both biological control agent (BCA) isolates. These bioactive compounds may responsible for antifungal activity. In vivo study revealed that culture filtrate extract manages to suppress disease lesions on the treated tomato fruit from 0.86 -1.03 cM, 30 days after inoculation. Based on overall findings suggested that P. protegens and B. casei were the promising BCA in controlling gray mold disease of tomato fruit.


Key words: Tomato fruit, gray mold disease, secondary metabolites, GC-MS, biological control

 

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