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Presently, zinc sulfate (ZnSO 4 ) based fertilizers are reported inefficient in flooded paddy fields which necessitates to find a better alternative for sustainable rice cultivation. This study was conducted to find out the effectiveness of bacterially solubilized Zn (BSZn) on the early growth of rice plants and the concentration of Zn in the plant parts in comparison to conventional ZnSO 4 . BSZn preparations were obtained from culture supernatant following ZnO solubilization by bacterial isolates  Burkholderia  spp. and  Achromobacter  sp. The effectiveness of BSZn was assessed on rice seed germination on Petri plates and the growth of seedlings upon treatment in hydroponic culture under controlled conditions. In general, BSZn obtained from certain  Burkholderia  spp. increased seed germination percentage (SG%) (98–100%), mean germination rate (MGR), mean daily germination (MDG), decreased mean germination time (MGT) and impart stimulating effect on seed germination as indicated by increased vigor indices compared to ZnSO 4  treatment regimes. The obtained data from the hydroponic culture of rice seedling growth indicated a positive influence of most of the BSZn preparation on dry and wet weight of roots and shoots, and seedling length compared to ZnSO 4  at  p  &lt; 0.05. Both chlorophyll and carotenoid content of the seedling increased in the presence of some BSZn preparations. In general, compared to shoot, the root of seedlings accumulated a higher amount of Zn (up to 888 µg Zn/g dry biomass). Zn concentration data indicated that BSZn16 obtained from  Burkholderia  sp. EIKU16 culture help to accumulate significantly higher amounts of Zn in rice seedlings under hydroponic culture than that while treated with ZnSO 4 .

journal of plant nutrition

Biosolubilized zinc from ZnO in bacterial culture supernatant enhanced seed germination, early growth, and zinc accumulation in rice ( Oryza sativa  L.) under hydroponic system through seed priming method