Journal
PLANT PATHOLOGY JOURNAL
Volume 28, Issue 3, Pages 270-281Publisher
KOREAN SOC PLANT PATHOLOGY
DOI: 10.5423/PPJ.OA.02.2012.0026
Keywords
colonization; DRAQ5; endophytic; Pantoea ananatis; pepper; PGPR
Categories
Funding
- National Research Foundation of Korea (NRF) grant
- Korea government (MEST) [2011-0010027]
- Next-Generation BioGreen 21 Program, Rural Development Administration, Republic of Korea [PJ00798402]
- National Research Foundation of Korea [2011-0010027] Funding Source: Korea Institute of Science & Technology Information (KISTI), National Science & Technology Information Service (NTIS)
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The bacteria B1-9 that was isolated from the rhizosphere of the green onion could promote growth of pepper, cucumber, tomato, and melon plants. In particular, pepper yield after B1-9 treatment on the seedling was increased about 3 times higher than that of control plants in a field experiment. Partial 16S rDNA sequences revealed that B1-9 belongs to the genus Pantoea ananatis. Pathogenecity tests showed non-pathogenic on kimchi cabbage, carrot, and onion. The functional characterization study demonstrated B1-9's ability to function in phosphate solubilization, sulfur oxidation, nitrogen fixation, and indole-3-acetic acid production. To trace colonization patterns of B1-9 in pepper plant tissues, we used DRAQ5 (TM) fluorescent dye, which stains the DNAs of bacteria and plant cells. A large number of B1-9 cells were found on the surfaces of roots and stems as well as in guard cells. Furthermore, several colonized B1-9 cells resided in inner cortical plant cells. Treatment of rhizosphere regions with strain B1-9 can result in efficient colonization of plants and promote plant growth from the seedling to mature plant stage. In summary, strain B1-9 can be successfully applied in the pepper plantation because of its high colonization capacity in plant tissues, as well as properties that promote efficient plant growth.
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