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KMID : 0545120100200030587
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Journal of Microbiology and Biotechnology
2010 Volume.20 No. 3 p.587 ~ p.593
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Plant Growth-Promoting Trait of Rhizobacteria Isolated from Soil Contaminated with Petroleum and Heavy Metals
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Koo So-Yeon
Hong Sun-Hwa
Ryu Hee-Wook
Cho Kyung-Suk
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Abstract
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Three hundred and seventy-four rhizobacteria were isolated from the rhizosphere soil (RS) or rhizoplane (RP) of Echinochloa crus-galli, Carex leiorhyncha, Commelina communis, Persicaria lapathifolia, Carex kobomugi, and Equisetum arvense, grown in contaminated soil with petroleum and heavy metals. The isolates were screened for plant growth-promoting potential (PGPP), including indole acetic acid (IAA) productivity, 1-aminocyclopropane-1-carboxylic acid (ACC) deaminase activity, and siderophore(s) synthesis ability. IAA production was detected in 86 isolates (23.0%), ACC deaminase activity in 168 isolates (44.9%), and siderophore(s) synthesis in 213 isolates (57.0%). Among the rhizobateria showing PGPP, 162 rhizobacteria had multiple traits showing more than two types of PGPP. The PGPP-having rhizobateria were more abundant in the RP (82%) samples than the RS (75%). There was a negative correlation (-0.656, p < 0.05) between the IAA-producers and the ACC deaminase producers. Clustering analysis by principal component analysis showed that RP was the most important factor influencing ecological distribution and physiological characterization of PGPP-having rhizobateria.
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KEYWORD
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Rhizobacteria, Plant growth-promoting potential, Indole acetic acid (IAA), 1-Aminocyclopropane-1-carboxylic acid deaminase, Siderophore(s)
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