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All Journal BIOTROPIA - The Southeast Asian Journal of Tropical Biology
Jacob, James Kennard Sanz
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Agriculture, Biological Sciences & Forestry Biochemistry, Genetics & Molecular Biology Immunology & microbiology Veterinary

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BIOCONTROL POTENTIAL OF ENDOPHYTIC Aspergillus spp. AGAINST Fusarium verticillioides Campos, Ron Patrick Cuagdan; Jacob, James Kennard Sanz
BIOTROPIA Vol. 28 No. 2 (2021): BIOTROPIA Vol.28 No.2, Agustus 2021
Publisher : SEAMEO BIOTROP

Show Abstract | Download Original | Original Source | Check in Google Scholar | Full PDF (208.611 KB) | DOI: 10.11598/btb.0.0.0.1274

Abstract

Fusarium verticillioides is the causal agent of ear, stalk and root rot of maize that results in the severe reduction in yields and quality of infected products. Endophytic fungi have been purported as potential candidates in controlling pathogens since they are considered strong plant mutualists that confer disease resilience to their host. The present study was carried out to determine the in vitro antagonistic activity and biocontrol potential of endophytic Aspergillus spp. associated with P. amboinicus leaves against F. verticillioides. Three fungal endophytes from the genus Aspergillus were isolated and identified from the leaves of P. amboinicus, namely A. flavus, A. terreus and A. niger. The fungal isolates were tested for antagonism against F. verticillioides in dual culture plates. Results indicate that the Aspergillus endophytes can restrict growth of F. verticillioides and employ varying mechanisms of antagonism. A. niger inhibited F. verticillioides by 47.37%, followed by A. flavus (41.02%) and A. terreus (27.91%) respectively. Observations of dual culture plates revealed that A. flavus and A. niger antagonized the pathogen via overgrowth mechanism while A. terreus employed antibiosis to restrict the growth of F. verticillioides. The varying degrees of antagonism exhibited by the Aspergillus endophytes show their potential as biocontrol agents and source of bioactive compounds
SPECIES DIVERSITY OF SOIL FUNGI FROM A CORN PLANTATION AT ECHAGUE, PHILIPPINES Tecson, Rey Mark Gascon; Temanel, Florenda C. Ballesteros -; Jacob, James Kennard Sanz
BIOTROPIA Vol. 28 No. 3 (2021): BIOTROPIA Vol. 28 No. 3 December 2021
Publisher : SEAMEO BIOTROP

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.11598/btb.2021.28.3.1469

Abstract

Soil fungi are a critical component of agroecosystems and provide ecological services affecting food and bioproduct production. Awareness of the composition and distribution of local species is necessary to maximize the productivity and sustainability of agroecosystems. This study aimed at isolating fungi from soil samples collected from a corn plantation at Echague, Isabela, morphologically defining, characterizing, and determining the diversity of fungal isolate species. Soil samples from five (5) different sampling units were collected, and microbiological techniques were used to isolate the fungi. Identification was performed by morphological characterization of fungal isolates guided by taxonomic keys and textbooks. Fungal diversity was assessed using Simpson's indices of diversity. Sixteen (16) fungal isolates were found; 12 were known and four (4) were unidentified. Ten (10) species belonged to the Ascomycota group, and two (2) belonged to the Zygomycota class. Aspergillus species dominated the region among all species isolated and established. Aspergillus fumigatus and Aspergillus flavus were densely populated and well distributed. A potent biocontrol agent was also identified, namely Trichoderma harzianum and Trichoderma viride. The Mucor sp. and Rhizopus stolonifer (Zygomycota fungi) were also identified.
Co-Authors Campos, Ron Patrick Cuagdan Tecson, Rey Mark Gascon Temanel, Florenda C. Ballesteros -