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Antagonistic Potentials of Some Soil Fungi Against Three Post-harvest Pathogenic Fungi of Carica Papaya L.

REZUANA BINTE HELAL
Department of Botany, University of Dhaka, Dhaka-1000, Bangladesh

SHAMIM SHAMS*
Department of Botany, University of Dhaka, Dhaka-1000, Bangladesh

Abstract/ Executive Summary:

Four antagonistic fungi were isolated from the papaya field soil by serial dilution and were identified as Aspergillus flavus Link., A. fumigatus Fresenius, A. niger van Tiegh. and Trichoderma viride Pers. The soil fungi were selected to evaluate their antagonistic potentiality against the three postharvest pathogenic fungi of Carica papaya L. following "dual culture colony interaction” and volatile and non-volatile metabolites. In dual culture colony interaction, out of four soil fungi, T. viride showed the highest growth inhibition on C. gloeosporioides (84.28%), F. nivale (95.23%) and Fusarium sp. (87.15%). On the other hand A. niger showed the highest growth inhibition on C. gloeosporioides (77.39%), F. nivale (98.63%) and Fusarium sp. (35.05%). The maximum inhibition of radial growth of C. gloeosporioides (77.64%), F. nivale (58.76%) and Fusarium sp. (79.37%). were observed in case of T. viride owing to the volatile metabolites. Whereas the maximum inhibition of radial growth of C. gloeosporioides (58.23%), F. nivale (37.43%) and Fusarium sp. (82.31%) were observed in case of A. niger owing to the volatile metabolites. The maximum inhibition of radial growth of C. gloeosporioides (90.90%), F. nivale (89.13%) and Fusarium sp. (76.84%) were observed in case of T. viride owing to the effect of non-volatile metabolites. The maximum inhibition of radial growth of C. gloeosporioides (92.42%), F. nivale (73.01%) and Fusarium sp. (68.67%) were observed in case of A. niger owing to the effect of non-volatile metabolites. Trichoderma viride and A. niger may be exploited commercially as a biocontrol agent against anthracnose and fruit rot pathogens of papaya.

Keywords: Antagonistic potentiality, Soil fungi, Pathogenic fungi, Diseased fruits, Carica papaya

Location: Department of Botany, University of Dhaka, Dhaka-1000, Bangladesh

Start Date: 00-04-2016

End Date: 00-11-2016

Program Area: Pest Management

Commodity: Papaya

Objectives:

To find out the biological efficacy as antagonist of the selected soil fungi against the pathogens of postharvest diseases of papaya.

Methodology:

Nineteen species of fungi were isolated from infected Shahi papaya during April to November, 2016. Among the isolated fungi three were found to be pathogenic to papaya fruits. The pathogenic fungi were C. gloeosporioides, F. nivale and Fusarium sp. These three fungi were selected as test pathogen against selected four antagonistic fungi. Serial dilution method was used to isolate antagonistic fungi from rhizosphere soil of the host varieties. Among the isolated soil fungi, Aspergillus flavus, A. fumigatus, A. niger and Trichoderma viride were selected to test their antagonistic potential against the pathogens following dual culture technique. Aforesaid fungi were previously tested on fungal isolates obtained from Musa sp. and found effective against the test fungi. The parameter used for the assessment of the colony interaction and per cent inhibition of radial growth was calculated. Effects of volatile and non-volatile metabolites of the selected soil fungi against the test pathogens were also studied. The results were statistically analyzed by t test.

Source of Information: Dhaka Univ. J. Biol. Sci. 28(1): 1-7, 2019 (January)

Article Link (Online Journal):

Funding Source:

Budget:

Total Budget (Tk.) :

Achievement/Findings:

The present investigation suggests that Trichoderma viride and Aspergillus niger may be exploited commercially as a biocontrol agent to protect postharvest decay of papaya fruits belongs to Carica papaya.

Knowledge Management: Journal