Efficacy of Plant Growth Promoting Rhizobacteria (PGPR) against Bacterial wilt of tomato (Lycopersicon esculentum Mill.)

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Date
2018
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Department of Biological Sciences Sam HigginbottomUniversity of Agriculture, Technology & Sciences (Formerly Allahabad Agricultural Institute) Allahabad-21007
Abstract
Tomato (Lycopersicon esculentum Mill.) is one of the most consumed and widely grown vegetable crops in the world which is an important source of vitamins and minerals in human diet. They contain the carotene, lycopene, one of the most powerful natural antioxidants. Tomato suffers from many diseases caused by fungi, bacteria, viruses and nematodes. Over 200 diseases have been reported to affect the tomato plants in the world. Among the bacterial diseases, bacterial wilt disease caused by Ralstonia solanacearum is one of the most destructive and widespread disease of bacterial origin affecting all solanaceous crop causing plant death and significant yield losses. The management of Bacterial wilt of tomato is difficult but managed by chemical. However chemicals have many ill effects on the environment, farmers and consumers and also affect the non-target organisms. Keeping in mind, losses of yield and there harmful effect we selected bio agents i.e. PGPR for the management of disease. In view of this, the aim of the study was to screen the potential PGPR against the bacterial wilt pathogen in-vitro via well-agar diffusion method and disc diffusion method against the pathogen Ralstonia solanacearum. The Selected five potential PGPRs PR3, PR9, PR17, PR25 and 3NAA8 were evaluated against the bacterial wilt pathogen on three different varieties of tomato in in-situ condition. The varieties are Pusa- 120, Navodaya and Golden green. Among all, the reduction in disease incidence percentage was recorded in plants treated with PR17 and 3NAA8 among all. In addition, the plant growth and yield was also improved by PR17 and 3NAA8 out of all five potential PGPR. Therefore, these results suggest that out of five antagonistic strains PR17 (Enterobacter spp.) and 3NAA8 (Bacillus spp.) support good antagonistic activity and could be applied as biocontrol agents against Bacterial wilt of tomato and for their potential to promote tomato plant growth.
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Ph.d. thesis
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