Phosphate Solubilizing Bacillus megaterium mj1212 Regulates Endogenous Plant Carbohydrates and Amino Acids Contents to Promote Mustard Plant Growth

Springer Science and Business Media LLC - 2014
Sang-Mo Kang1, Ramalingam Radhakrishnan1, Young-Hyun You2, Gil-Jae Joo3, In-Jung Lee1, Ko-Eun Lee4, Jin-Ho Kim4
1School of Plant Biosciences, Kyungpook National University, Daegu, Republic of Korea
2School of Life Sciences, Kyungpook National University, Daegu, Republic of Korea
3Institute of Agricultural Science and Technology, Kyungpook National University, Daegu, Republic of Korea
4School of Ecology and Environmental Science, Kyungpook National University, Sangju, Republic of Korea

Tóm tắt

The current study was conducted to explore the potential of a phosphate solubilizing soil bacterium, Bacillus megaterium mj1212 for enhancing the growth of mustard plants. The newly isolated bacterial strain mj1212 was identified as B. megaterium using phylogenetic analysis and, its phosphate solubilization ability was shown by the clear zone formation on National Botanical Research Institute’s Phosphate medium. Moreover, the phosphate solubilization ability of B. megaterium mj1212 was enhanced by optimal culture conditions at pH 7.0 and 35 °C which might be due to the presence of malic and quinic acid in the culture medium. The beneficial effect of B. megaterium mj1212 in mustard plants was determined by an increasing shoot length, root length and fresh weight of plants. In the biochemical analysis revealed that chlorophyll, sucrose, glucose, fructose and amino acids (Asp, Thr, Ser, Glu, Gly, Ala, Cys, Val, Met, Ilu, Leu, Tyr, Phe, Lys, His, Arg and Pro) were higher in B. megaterium mj1212 treated plants, when compared to their control. The result of present study suggests that B. megaterium mj1212 treatment could be act as phosphate biofertilizer to improve the plant growth.

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