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Expression analysis on mycoparasitism related genes during antagonism of Trichoderma with Colletotrichum falcatum causing red rot in sugarcane

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Abstract

Present study was aimed to select a suitable Trichoderma isolate as candidate antagonist based on its efficacy in producing cell wall degrading enzymes (CWDEs), its mycoparasitism activity and expression of related genes against the red rot pathogen caused by Colletotrichum falcatum in sugarcane. For which, six different isolates of Trichoderma selected from our earlier studies (T. harzianum, T. asperullum) were evaluated based on their capability in releasing cell wall degrading enzymes individually and during antagonism with C. falcatum in dual plate. Amongst T. harzianum (T20) exhibited the greatest mycoparasitic potential against the C. falcatum, by producing higher concentration of  CWDEs viz., chitinase and β-1, 3-glucanase, slightly lower amounts of cellulase and protease with significant reduction in polygalacturonase produced by pathogen. Further microscopic observation on interaction of C. falcatum with the selected isolate of T. harzianum (T20) exhibited the mycoparasitic activity of antagonist over pathogen in dual culture and inhibition of C. falcatum pathogenesis in detached sugarcane leaves. In addition, expression pattern of eight genes coding various enzymes involved in mycoparasitism by T. harzianum over C. falcatum were analyzed using qRT-PCR in vitro and on sugarcane leaves. In in vitro interactions, five genes of  cell wall degrading enzymes viz., chitinase (chit33), endochitinase (endo42), β-1, 3-glucanase (glu), exochitinase 1 (exc1), exochitinase 2 (exc2), were upregulated during and after contact as compared to before contact, while three genes related with proteases such as alkaline proteinase (prb1), trypsin-like protease (Pra1), subtilin-like serine protease (ssp), genes were upregulated during the contact with C. falcatum and slightly down regulated after contact. In detached leaves, seven genes were potentially upregulated except subtilin-like serine protease, which was down regulated during interaction of C. falcatum and T. harzianum as compared to T. harzianum inoculation alone. All these biochemical and molecular results confirm the efficacy of T. harzianum (T20) against C. falcatum and justify the right selection of candidate antagonist for our further studies on identification of antifungal genes/proteins against C. falcatum in sugarcane.

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Acknowledgements

The authors are grateful to the Director, ICAR-Sugarcane Breeding Institute for providing facilities and constant encouragement. The financial support received from Sugarcane Development Fund, Ministry of Consumer Affairs, Food & Public, New Delhi is duly acknowledged.

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Authors and Affiliations

  1. Plant Pathology Section, Crop Protection Division, ICAR-Sugarcane Breeding Institute, Coimbatore, Tamil Nadu, 641 007, India

    Elangovan Elamathi, Palaniyandi Malathi, Rasappa Viswanathan & Amalraj Ramesh Sundar

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  1. Elangovan Elamathi
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  2. Palaniyandi Malathi
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  3. Rasappa Viswanathan
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  4. Amalraj Ramesh Sundar
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Correspondence to Palaniyandi Malathi.

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Elamathi, E., Malathi, P., Viswanathan, R. et al. Expression analysis on mycoparasitism related genes during antagonism of Trichoderma with Colletotrichum falcatum causing red rot in sugarcane. J. Plant Biochem. Biotechnol. 27, 351–361 (2018). https://doi.org/10.1007/s13562-018-0444-z

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