Genetic diversity of cultivable plant growth-promoting rhizobacteria in Korea

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Title
Genetic diversity of cultivable plant growth-promoting rhizobacteria in Korea
Author(s)
W I Kim; W K Cho; S M Kim; Hyo Sub Chu; K Y Ryu; J C Yun; C S Park
Bibliographic Citation
Journal of Microbiology and Biotechnology, vol. 21, no. 8, pp. 777-790
Publication Year
2011
Abstract
To elucidate the biodiversity of plant growth-promoting rhizobacteria (PGPR) in Korea, 7,638 bacteria isolated from the rhizosphere of plant species growing in many different regions were screened. A large number of PGPR were identified by testing the ability of each isolate to promote the growth of cucumber seedlings. After redundant rhizobacteria were removed via amplified rDNA restriction analysis, 90 strains were finally selected as PGPR. On the basis of 16S ribosomal RNA sequences, 68 Gram-positive (76%) and 22 Gram-negative (24%) isolates were assigned to 21 genera and 47 species. Of these genera, Bacillus (32 species) made up the largest complement, followed by Paenibacillus (19) and Pseudomonas (11). Phylogenetic analysis showed that most of the Grampositive PGPR fell into two categories: low- and high- G+C (Actinobacteria) strains. The Gram-negative PGPR were distributed in three categories: α-proteobacteria, β- proteobacteria, and γ-proteobacteria. To our knowledge, this is the largest screening study designed to isolate diverse PGPR. The enlarged understanding of PGPR genetic diversity provided herein will expand the knowledge base regarding beneficial plant-microbe interactions. The outcome of this research may have a practical effect on crop production methodologies.
Keyword
CucumberDiversityPGPRPlant growth promotionRhizobacteriaRhizosphere
ISSN
1017-7825
Publisher
South Korea
DOI
http://dx.doi.org/10.4014/jmb.1101.01031
Type
Article
Appears in Collections:
1. Journal Articles > Journal Articles
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