Control of Fusarium Wilt Using Streptomyces griseus with Plant Growth-Promoting Effect on Tomato
The efficacy of antagonistic Streptomyces griseus was evaluated against tomato wilt disease incited by Fusarium oxysporum. Among the different formulations, Streptomyces griseus with chitin amended formulation showed effective increase in seed germination and seedling vigour. Further, talc-based formulations of S. griseus mixed with or without chitin was developed and tested under greenhouse conditions. Lowest disease severity of 19.1% was observed in plants treated with self fusant (SFSg 5) S. griseus suspension (root dipping – 9 x 108 cfu / mL) followed by 19.5% in treatment of chitin amended S. griseus (root dipping – 9 x 108 cfu/mL) was recorded over control. Plant growth of the treated traits were analyzed and compared with control. The shoot length, root length, leaf area was increased significantly over the controls by the treatment of self fusant (SFSg 5) S. griseus suspension followed by nearby values were reached in chitin amended S. griseus was recorded. The chemical treatments had less effect compared with these formulations. Histochemical studies showed that cambium layers, xylem vessels per bundle, and the vessel diameter decreased in the plants inoculated with F. oxysporum over control and changes in variables were observed in infected plants treated with S. griseus. In conclusion, S. griseus can be a potential biocontrol agent against F. oxysporum for better crop production practices.