Journal
SOIL SCIENCE AND PLANT NUTRITION
Volume 46, Issue 3, Pages 617-629Publisher
JAPANESE SOC SOIL SCIENCE PLANT NUTRITION
DOI: 10.1080/00380768.2000.10409127
Keywords
Curtobacterium; endophytic bacteria; Methylobacterium; pectinase; rice
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Endophytic bacteria were isolated from surface-sterilized stems, seeds, and leaf sheaths of wild and traditionally cultivated rice varieties. Phylogenetic analyses based on 16S rDNA revealed a wide divergence among the isolates, However, the most frequently isolated groups were Methylobacterium sp. in the alpha-subdivision of Proteobacteria, and Curtobacterium sp. in the high G+C Gram-positive group. Various phenotypic traits that are expected to be involved in the persistence and functions of the bacteria were analyzed: Most of the isolates from rice excreted pectinase, were motile, and showed an osmotic resistance to 0.6 M sucrose, These traits may be involved in endophytic characteristics in rice, About 50% of the isolates showed a cellulase activity, A few isolates fixed nitrogen, produced indole-3-acetic acid, and formed capsules. These activities were partially correlated with the phylogenetic group.
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