Characterization of plant-growth promoting diazotrophic bacteria isolated from field grown Chinese cabbage under different fertilization conditions |
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Authors: | Woo-Jong Yim Selvaraj Poonguzhali Munusamy Madhaiyan Pitchai Palaniappan M A Siddikee Tongmin Sa |
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Institution: | (1) Department of Agricultural Chemistry, Chungbuk National University, Cheongju, Chungbuk, 361-763, Republic of Korea |
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Abstract: | Diazotrophic bacteria isolated from the rhizosphere of Chinese cabbage were assessed for other plant growth promoting characteristics
viz., production of IAA, ethylene, ACC deaminase, phosphate solubilization, and gnotobiotic root elongation. Their effect on inoculation
to Chinese cabbage was also observed under growth chamber conditions. A total of 19 strains that showed higher nitrogenase
activity identified by 16S rRNA gene sequence analysis were found to be the members of the genera Pseudomonas and Agrobacterium belonging to α- and γ-Proteobacteria groups. These strains were also efficient in producing IAA and ACC deaminase though they produced low levels of ethylene
and no phosphate solubilization. In addition, inoculation of selected diazotrophic bacterial strains significantly increased
seedling length, dry weight, and total nitrogen when compared to uninoculated control. The colonization of crop plants by
diazotrophic bacteria can be affected by many biotic and abiotic factors, and further studies are oriented towards investigating
the factors that could influence the establishment of a selected bacterial community. |
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Keywords: | diazotrophs nifH gene IAA production acetylene reduction ethylene Agrobacterium Pseudomonas |
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