Bicol University R&D Journal

Official Refereed Journal of Bicol University

4500 Legazpi City,Philippines

Print ISSN: 0016-4139       Online ISSN: 2719-082X

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Vol 26, Issue 1
August 2023

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Biology

Antibacterial Activities of Endophytic Fungi from Capsicum annuum L. (Siling labuyo) leaves and fruits

Publisher: Bicol University
Abstract

Endophytic fungi were isolated from Capsicum annuum (siling labuyo) from three ecological zones in the province of Albay, Philippines and were identified through morpho-cultural characteristics and by molecular analysis of the internal transcribed spacer (ITS) region of the 18S ribosomal DNA. Eight fungal endophytes were isolated from the leaves and fruits. Seven were identified as Colletotrichum gloeosporioides, Lasiodiplodia pseudotheobromae, Nigrospora sphaerica, Guignardia mangiferae, Coprinopsis cinerea, Colletotrichum siamense and Colletotrichum truncatum while one remained unidentified. The extracted metabolites from the isolates were then screened for their antibacterial activities at 1,000 µg/mL. Among the fungal isolates, C. cinerea was found to be the most active against Staphylococcus aureus and Escherichia coli with zones of inhibition (ZOI) of 16.00 ± 1.00 and 17.00 ± 1.53 mm, respectively. Phytochemical screening showed that C. cinerea produced a variety of secondary metabolites such as flavonoids, alkaloids, terpenoids and quinones. The other fungal endophytes were also found to synthesize various secondary compounds that may be responsible for their antibacterial activities.


Eliza Ann A. Arena
Mae Breech R. Bernal
Jazzlyn T. Imperial

antimicrobial
Bicol
Escherichia coli
mycology
sili
Staphylococcus aureus

July 08, 2019
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CHED-JIP Recognized Journal as per CMO NO. 50, s. 2018.

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Higher Education Regional Research Center, Bicol University East Campus, Legazpi City, Albay, Philippines

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