Abstract
Albugo candida, the causative agent of white rust disease in Indian mustard [Brassica juncea (L.) Czern. & Coss.], affects yield and quality of the crops. Biocontrol agents that induce disease resistance in crop plants against pathogen could be a reliable alternative to the chemical control. In this regard, we demonstrated the capabilities of Trichoderma harzianum, an efficient biocontrol agent to induce resistance in B. juncea against A. candida under green house conditions. Trichoderma harzianum treatment of Brassica seedlings followed by A. candida infection demonstrated an acquired resistance with an optimal disease control (45.6% disease reduction). This interaction exhibited an increase in antioxidant enzymes (glutathione reductase and peroxidase) and decreased in phosphatase activity. It also induced up-regulation of MAPK 6 and 17 genes. Hence, it is concluded that T. harzianum induced disease resistance in B. juncea against A. candida infection through the involvement of MAP kinase and up-regulation of antioxidant enzymes.
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