eng Enviro Research Publishers Current Agriculture Research Journal 2347-4688 2321-9971 2026-05-11 14 1 146 160 26839 article Sandeep Kumar Gupta 1 Seema Devi 1 Jay Kishor Prasad 1 Riddha Dey 1 Surya Prakash Dube 1 Poonam Singh 1 Department of Botany, Mahila Mahavidyalaya, Banaras Hindu University, Varanasi, Uttar Pradesh, India. Micronutrient deficiencies have significant impacts on plant growth, grain yield and nutritional quality. Biofortification through seed biopriming can be an effective strategy in meeting the challenges of malnutrition under the changing climatic conditions. Therefore, to evaluate the effects of potent growth promoting rhizospheric microbes Enterobacter cloacae BHUSR1, Serratia marcescens BHUSR2 and Klebsiella aerogenes BHUSR3 on nutrient content of oat grains at different irrigation levels (7 and 10 days) the present work was undertaken. The experiments were conducted in field trials in a randomized complete block design, and the data were statistically analyzed using analysis of variance (ANOVA). The yield was improved significantly upto 93% after seed biopriming even when grown under drought. Improvement in macronutrients observed was upto 39.4% for potassium, 51.1% for phosphorus, while the essential micro-nutrients augmented were 50.5% zinc and 41.6% manganese. Among all the selected strains Klebsiella aerogenes BHUSR3 was found to be most effective in mobilizing phosphorous, potassium, iron, zinc, manganese under irrigated conditions. The macro and micro-nutrients biofortified under drought were bacterial dependent with no common trend observed. http://www.agriculturejournal.org/volume14number1/nutrient-fortification-in-avena-sativa-grains-through-rhizoengineering-under-water-stress/ Biofortification; Drought; Enterobacter cloacae; Klebsiella aerogenes; Oat grains; Seed biopriming; Serratia marcescens