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Bioprospecting rhizospheric microorganism in the management of early blight of tomato (Solanum lycopersicum L.)

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Title Bioprospecting rhizospheric microorganism in the management of early blight of tomato (Solanum lycopersicum L.)
 
Creator Maurya, Upasana
 
Contributor P. Lal, Eugenia
 
Subject planting, developmental stages, yields, groundnuts, genotypes, drying, genetics, statistical methods, harvesting, biological phenomena
Tomato, PGPR, Siderophore production, Ammonia production, IAA production, Phosphate solublization, HCN production, Catalase, Phosphorous solubilization, antifungal activity.
 
Description Thesis titled “Bioprospecting rhizospheric microorganism in the management
of early blight of tomato (Solanum lycopersicum L.)”” submitted in partial fulfillment of the requirements for the award of the degree of Doctor of Philosophy in Botany by UPASANA MAURYA.
Early blight caused by Alternaria solani has been known to cause yield lose up to 80%. The disease manifest as leaf spot with dark brown to black concentric ring which later enlarge andresult in blighting of leaves, & fruits. Dark spot and sunken lesion appear near the base of stemresulting in stunting and girdling of stem. Presently, the management of tomato of early blightdisease has been done with application of chemical fungicide & pesticide .However it may not besustainable in the longer run as chemical fungicides are known to causes residual toxicity,toxicity to non- target organism and other environmental hazards. Therefore, recent efforts havebeen focused on developing ecofriendly, safe, long lasting, and effective management strategiesfor the management of leaf spot of tomato disease through biocontrol agent such as PGPR, Thisagents are ecofriendly, sustainable and alternative to chemical fungicide. The presentinvestigation was aimed to isolate, screen, characterize and identify indigenous antagonisticrhizobacteria which could inhibit the infection and proliferation of early blight of tomato causedby Alternaria solani. In present study, 100 rhizobacterial strains were isolated from therhizosphere of tomato plants, and out of these 15 isolates showed superior potential for plantgrowth promoting properties. And further out of these 15 isolates six were selected forantagonistic activity in which five isolates shown maximum potential to inhibit the growth ofAlternaria solani. These bacterial isolates were screened in-vitro for different plant growthpromoting activities i.e. phosphate solubilization, IAA production, siderophore producing,ammonia production, HCN production. Out of five isolates TR25, TR24 and TR22 showedstrong production of IAA, Siderophore and phosphate solublization and ammonia production,while TR18 showed low production. These PGPR also produce catalase enzymes. On the basischaracterization, the efficacy of PGPR strains was selected as potent biocontrol agent. Theserhizobacteria were also used as bio-inoculants on tomato plant in the field experiment undernatural condition. In field evaluation TR25 was found most effective for seed germination ratiofollowed by TR24. The maximum plant height, yield and reduced PDI were recorded in TR25followed by TR24 against control.
 
Date 2017-01-16T14:16:33Z
2017-01-16T14:16:33Z
2016
 
Type Thesis
 
Identifier http://krishikosh.egranth.ac.in/handle/1/96482
 
Language en_US
 
Format application/pdf
 
Publisher Sam Higginbottom Institute of Agriculture, Technology & Sciences (SHIATS)