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Tomato (Lycopersicon esculentum L.) is a popular vegetable widely grown in the tropics, which is mainly attacked by the
Early blight disease incited by Alternaria solani. In this present scenario, ecofriendly alternative strategies such as use of
Trichoderma harzianum and Pseudomonas fluorescence from rhizosphere and abiotic inducers (3% Mannitol, 2.5% Chitosan,
Arachidonic acid) are being explored. Efficacy of various inducers were evaluated under green house conditions for efficacy in
suppressing incidence of Early blight disease and promoting plant growth in tomato. Among the various inducers tested, 2.5%
Chitosan and combination of 3% Mannitol and Trichoderma harzianum increased the plant growth and highly inhibited the
mycelial growth of the pathogen under in vitro conditions. In green house studies, seed treatment combination of 3% Mannitol
and Trichoderma harzianum significantly reduced incidence of the disease (66.23 % more efficient than control), compared to the
other inducers. Expression of various defense-related enzymes was found to be involved in the induction of systemic resistance
against pathogen infection. Tomato plants were treated with a combination of 3% Mannitol and Trichoderma harzianum based
bioformulation and seedlings were challenge inoculated with the pathogen, Alternaria solani. Induced enzyme activities were
observed with both the defense related enzymes such as Peroxidase (PO) and Phenylalanine Ammonia Lyase (PAL). The enzyme
activity increased from 24 hr of after inoculation and maximum activity was observed at 48 hr after inoculation and then it
slightly decreased. The possible applications of a combination of Mannitol and Trichoderma harzianum tomato seed biopriming
for effective management of early blight disease is discussed in the paper
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