4.4 Article

Dual Trichoderma consortium mediated elevation of systemic defense response against early blight in potato

Journal

EUROPEAN JOURNAL OF PLANT PATHOLOGY
Volume 162, Issue 3, Pages 681-696

Publisher

SPRINGER
DOI: 10.1007/s10658-021-02431-4

Keywords

Potato; Alternaria solani; Early blight; Defense response; Trichoderma spp; Biocontrol

Funding

  1. Banaras Hindu University, Varanasi, India
  2. Ministry of Science and Higher Education of the Russian Federation project on the development of the Young Scientist Laboratory [LabNOTs-21-01AB]

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The study demonstrated that the use of Trichoderma viride and Trichoderma harzianum significantly inhibited the early blight pathogen in potatoes, while promoting defense enzyme activity and growth. The consortium of Trichoderma spp. was shown to effectively elevate the host defense response by modulating enzyme activities and growth parameters.
The annual crop loss caused due to phytopathogens is a serious problem affecting food security. To overcome the losses due to phytopathogens, the application of toxic pesticides is the only alternative but pose a serious threat to human and environmental health. Hence, more eco-friendly and sustainable approaches for efficient management of phytopathogens are urgently required. In this study, we evaluated the effectiveness of Trichoderma viride and Trichoderma harzianum as single as well as in consortium for elevating the systemic defense response and growth promotion activities in potato challenged with early blight pathogen Alternaria solani. The percent of mycelial inhibition of A. solani by T. viride (91.88%) and T. harzianum (80.11%) was recorded and compared with control. Scanning electron microscope (SEM) observations revealed the collapsed hyphae and sunken conidia of A. solani due to antagonistic activity of T. viride and T. harzianum. Induction of defense enzymes including total phenolic content (TPC), phenylalanine ammonia lyase (PAL), superoxide dismutase (SOD) and total protein content was increased 3.19, 3.72, 1.99 and 2.5 folds, respectively in consortia of Trichoderma spp. treated plants as compared to pathogen infected plants at 48 hapi. HPLC analysis demonstrated higher production free poly-phenolic compounds during combined application of Trichoderma spp. treated potato plants in the response of A. solani infection. This study demonstrates that the consortium of Trichoderma spp. is effective in elevating the host defense response by modulating the activities of phenylpropanoid derivatives, pathogenesis related proteins (PR-proteins), enzymes of oxidative stress network, and growth parameters in potato challenged with the early blight pathogen, A. solani

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