Browsing by Author "Yadav, R"

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    Bacteria from native soil in combination with arbuscular mycorrhizal fungi augment wheat yield and biofortification
    (Elsevier, 2020) Yadav, R; Ror, P; Rathore, P; Ramakrishna, W.
    Plant growth promoting bacteria (PGPB) have been used to enhance crop productivity. The effect of native PGPB and arbuscular mycorrhizal (AM) fungi in combination on wheat yield, biofortification and soil enzymatic activity is a relatively unexplored area. Twenty seven bacterial isolates from three different soils were characterized for their plant growth promoting traits. A total of three native and five non-native bacteria were used with and without arbuscular mycorrhizal (AM) fungi in an open greenhouse pot experiment with two wheat varieties to evaluate their effect on wheat yield, nutrient uptake, and soil health parameters. Wheat plants subjected to native PGPB (CP4) (Bacillus subtilis) and AM fungi treatment gave the best results with reference to macronutrient (nitrogen and phosphorus), micronutrient (iron and zinc) content in wheat grains and yield-related parameters, including thousand grain weight, number of grains per spike and total tillers per plant in both wheat cultivars. Treatment with CP4 and CP4 plus AM fungi enhanced total chlorophyll in wheat leaves indicating higher photosynthetic activity. Significant improvement in soil health-related parameters, including soil organic matter and dehydrogenase activity, was observed. Significant correlation among grain yield-related parameters, nutrient enhancement, and soil health parameters was observed in PGPB and AM fungi treated plants, especially HD-3086. These results provide a roadmap for utilizing native PGPB and AM fungi for enhancing wheat production in Punjab state of India and exploring their utility in other parts of the country with different soil and environmental conditions. - 2020 Elsevier Masson SAS
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    Green Silver Nanoparticles for Phytopathogen Control
    (Springer, 2019) Gautam, N; Salaria, N; Thakur, K; Kukreja, S; Yadav, Neha; Yadav, R; Goutam, U.
    Plant diseases bring radical problem in the agriculture sector. Phytopathogens mediate diseases that pose considerable loss of yield and quality deterioration which eventually bring down the crop yield and the rural economy. The present study is, thus, focused on developing the optimized protocol for the synthesis of silver nanoparticles (AgNPs) by green chemistry approach and revealing their antimicrobial potential against phytopathogens. The synthesis of AgNPs was carried out by using aqueous plant extracts of three medicinal and aromatic plants, namely Allium cepa (onion), Allium sativum (garlic) and Zingiber officinale (ginger). AgNPs were characterized by various analytical techniques including UV–visible spectra, PSA, FTIR, TEM and XRD analysis. The AgNPs were spherical with size ranging from 1 to 10 nm, crystalline in nature and relatively stable up to 3 months after synthesis. The AgNPs conferred strong antimicrobial activity against selective bacterial and fungal phytopathogens. The antimicrobial activity of the AgNPs was observed against Erwinia sp., Pseudomonas syringe, Bacillus megaterium, Fusarium graminearum, F. avenaceum and F. culmorum. The effective concentration against bacterial pathogens was found to be between 50 µg/ml (garlic/Erwinia sp.) and 130 µg/ml (onion/B. megaterium). In the case of fungal pathogens, the range was 90 µg/ml (garlic/F. avenaceum) to 110 µg/ml (onion/F. graminearum) for an effective dose. © 2019, The National Academy of Sciences, India.