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Agronomy 2019, 9(3), 144; https://doi.org/10.3390/agronomy9030144

Isolation and Characterization of the High Silicate and Phosphate Solubilizing Novel Strain Enterobacter ludwigii GAK2 that Promotes Growth in Rice Plants

1
School of Applied Biosciences, Kyungpook National University, Daegu 41566, Korea
2
Microorganism Resources Division, National Institute of Biological Resources, Incheon 22689, Korea
3
Institute of Agricultural Science and Technology, Kyungpook National University, Daegu 41566, Korea
4
School of Ecology & Environmental System, Kyungpook National University, Sangju 37224, Korea
5
Department of Natural Sciences, Naval Academy, Changwon 51698, Korea
*
Author to whom correspondence should be addressed.
Ko-Eun Lee and Arjun Adhikari contributed equally to this work.
Received: 11 February 2019 / Revised: 15 March 2019 / Accepted: 18 March 2019 / Published: 20 March 2019
(This article belongs to the Special Issue Plant Mineral Nutrition: Principles and Perspectives)
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Abstract

Silicon (Si) and phosphorus (P) are beneficial nutrient elements for plant growth. These elements are widely used in chemical fertilizers despite their abundance in the earth’s crust. Excessive use of chemical fertilizers is a threat to sustainable agriculture. Here, we screened different Si and P solubilizing bacterial strains from the diverse rice fields of Daegu, Korea. The strain with high Si and P solubilizing ability was selected and identified as Enterobacter ludwigii GAK2 through 16S rRNA gene sequence analysis. The isolate GAK2 produced organic acids (citric acid, acetic acid, and lactic acid), indole-3-acetic acid, and gibberellic acid (GA1, GA3) in Luria-Bertani media. In addition, GAK2 inoculation promoted seed germination in a gibberellin deficient rice mutant Waito-C and rice cultivar ‘Hwayoungbyeo’. Overall, the isolate GAK2 increased root length, shoot length, fresh biomass, and chlorophyll content of rice plants. These findings reveal that E. ludwigii GAK2 is a potential silicon and phosphate bio-fertilizer. View Full-Text
Keywords: Enterobacter ludwigii GAK2; silicon; phosphorus; solubilization; plant growth Enterobacter ludwigii GAK2; silicon; phosphorus; solubilization; plant growth
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This is an open access article distributed under the Creative Commons Attribution License which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited (CC BY 4.0).
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Lee, K.-E.; Adhikari, A.; Kang, S.-M.; You, Y.-H.; Joo, G.-J.; Kim, J.-H.; Kim, S.-J.; Lee, I.-J. Isolation and Characterization of the High Silicate and Phosphate Solubilizing Novel Strain Enterobacter ludwigii GAK2 that Promotes Growth in Rice Plants. Agronomy 2019, 9, 144.

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