Identification of Trichoderma species and their antagonistic potential against Aspergillus flavus in groundnut

    Srilakshmi, P and Thakur, R P and Prasad, K S and Rao, V P (2001) Identification of Trichoderma species and their antagonistic potential against Aspergillus flavus in groundnut. International Arachis Newsletter, 21. pp. 40-43. ISSN 1010-5824

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    Abstract

    The antagonistic potential of 212 Trichoderma isolates, obtained from soil samples collected from 4 districts in Andhra Pradesh, India, and 2 districts in Karnataka, India, against a highly aggressive and toxigenic strain of A. flavus (Af 11-4) was investigated. One-hundred and forty-five isolates were antagonistic to Af 11-4. Among these, only 39 showed clear inhibition zone against Af 11-4. These isolates were identified and further evaluated for antagonism, involving production of volatile and non-volatile antibiotics, and hyphal interaction with Af 11-4. The 39 isolates were classified into 6 groups: T. harzianum (11), T. hamatum (1), T. viride (9), T. longibrachiatum (5), T. koningii (9), T. pseudokoningii (3); and unknown species, based on morphological traits and inhibition zone against Af 11-4. Twenty-one isolates showed inhibition of Af 11-4 colony by producing volatile antibiotics compared with the control. Among the isolates, T 102 (T. longibrachiatum) showed the maximum inhibition. Fifteen isolates showed inhibition of Af 11-4 colony by producing diffusible antibiotics compared with the control. Isolate T 29 (T. pseudokoningii), T 42 (T. harzianum), and T 83 (T. koningii) showed significant inhibition of Af 11-4 growth. Examination under microscope for hyphal interactions showed that isolates T 16 (T. viride), T 109 (T. harzianum), and T 188 (T. viride) showed clear hyphal coiling with Af 11-4 mycelia.

    Item Type: Article
    Divisions: UNSPECIFIED
    CRP: UNSPECIFIED
    Subjects: Mandate crops > Groundnut
    Depositing User: Library ICRISAT
    Date Deposited: 22 Sep 2011 10:12
    Last Modified: 22 Sep 2011 10:12
    URI: http://oar.icrisat.org/id/eprint/1881
    Official URL:
    Projects: UNSPECIFIED
    Funders: UNSPECIFIED
    Acknowledgement: The authors thank Mr V Papaiah, Genetic Resources and Enhancement Program, ICRISAT for his help in cluster analysis and making the dendrogram.
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