INVESTIGATING Trichoderma ISOLATES AS DEFENDER ENZYMES INDUCERS AGAINST Fusarium oxysporum f.sp.lycopersici IN TOMATO PLANT

• Main Author: Warka S.Q. Al-Taee
• Format: Article
• Language: Arabic
• Published: College of Agriculture 2010-02-01
• Series: Mesopotamia Journal of Agriculture
• Online Access: https://magrj.mosuljournals.com/article_36308_f5d013e166cf5d02d6d0a23ccb88377c.pdf

Inorder to get an effective isolate of Trichoderma as biocontrol agent, six isolates of T.harzianum and isolate of T.viride were used for control of Fusarium oxysporum f.sp.lycopersici, the cause of vascular wilt of tomato .Results revealed that the isolates of Th1, Th3, Th4 and T.viride were the best antagonisum fungi, these results were supported by marked highest biomass, reduced PH of culture media, and their sporulation. There isolates also improved significant induction of plant systemic disease resistance throughout inducing peroxidase, polyphenoloxidas and catalaze in tomato roots. Isolates of Th3 and T.viride were the most effective bicontrol agents since inducing of these enzymes by 1.192 and 1.288 min/g f.w for peroxidase and 0.724 and 0.564 min/ g f.w for polyphenoloxidase , and 0.065, 0.054 min/ g f.w for catalaze, respectively. Therefore, the total phenols accumulation in the roots were exceeded to 1.42 and 1.12 for each isolate, respectively.