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• W3209870523 abstract "Groundnut (Arachis hypogaea L.) is a major legume crop belongs to the Fabaceae family and an important edible oil seed crop. A variety of microbial diseases have been identified as infecting the crop. Sclerotium rolfsii (sacc.) is a soil-borne phytopathogenic fungus that causes stem rot disease, which is a serious issue in groundnut production [1]. According to disease survey data, stem rot disease alone caused a 25% to 80% reduction in groundnut yield in the Rayalaseema area of Andhra Pradesh [2]. Dark brown lesions, wilting, and cottony mycelial development of the fungus are common signs of stem rot-infected plants [3]. Endophytes possess the antagonistic characteristic. Endophytes have the ability to invade the tissues of plants, where native endophytes outcompete disease - causing organisms and inhibit their establishment. The capacity of various bacterial endophytes to stimulate growth is the result of a direct or indirect process [4]. Random Amplified Polymorphic DNA (RAPD) and 16S rDNA are extremely useful for identifying antagonists and molecular characterization of prospective biocontrol drugs. When repeatability can be reliably achieved with replications using the same primers, the RAPD approach is highly effective in genetic mapping and molecular characterization since it is a quick, inexpensive, and simple procedure. In the long term, these molecular methods will aid in the development of SCAR markers for the detection of possible biocontrol agents [5]. As a result, an attempt was made in this study to determine the feasibility of utilizing root and seed endophytes to treat stem rot in groundnut induced by S. rolfsii. The main objectives in this study include (i). Isolation of bacterial endophytes from groundnut roots and seeds, (ii). Identification of Potential biocontrol agents against S. rolfsii, (iii). Molecular characterization of potential endophytic bacteria by RAPD and 16S rDNA analysis. A detailed study was carried out on the isolation of antagonistic endophytic bacteria from root and seed habitats against S. rolfsii and molecular characterization of potential bio-control agents using RAPD and 16S rDNA analysis. Among the 55 endophytic bacteria isolated from root and seed habitats of groundnut, out of 10 (Table.1), only two seed endophytic bacteria viz., Groundnut Seed Endophyte (GSE)-4 and GSE-10 were able to inhibit the pathogen up to 50.83% and 48.33% respectively. Out of 45 root endophytes (Table.2), the isolates Groundnut Root Endophyte (GRE)-5 and GRE-2 were able to control the pathogen up to 50.0% and 46.67% respectively. The RAPD banding profiles with random primers viz., OPA-14 (Fig.1.A), OPA-18 (Fig.1.B) and OPD-2 (Fig.1.C) showed polymorphism and the relationship among the isolates were evaluated by cluster analysis of data-based matrix. The dendrogram was generated using UPGMA package based on wards squared equalidean distance method (Fig.2. A and B). A fragment of 1300 bp (Fig.1.D) was amplified in all the four potential biocontrol agents viz., GSE-4, GSE-10, GRE-5 and GRE-2 by 16SrDNA analysis for identification. Using these antagonistic bacteria, a bio formulant can be made which is sustainable since it is chemical-free. This research work will be an example for future formulations and tells the importance of natural bio formulants instead of pesticides." @default.
• W3209870523 created "2021-11-08" @default.
• W3209870523 creator A5073376326 @default.
• W3209870523 date "2021-10-12" @default.
• W3209870523 modified "2023-09-25" @default.
• W3209870523 title "Molecular characterization of antagonistic endophytic bacterium against Sclerotium rolfsii (scc.) causing stem rot in groundnut" @default.
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