High population of Sphingomonas species on plant surface
1998
Kim, H. | Nishiyama, M. | Kunito, T. | Senoo, K. | Kawahara, K. | Murakami, K. | Oyaizu, H.
A unique microbial community exists on upper leaf surfaces because strong irradiation by the sun restricts and selects growing micro-organisms. The micro-organisms on plant aerial parts are possibly able to control plant pathogens and to promote plant growth as do some of the micro-organisms on plant roots. Sphingomonas species on plant tissues (seed, leaf and flower) were detected and enumerated by the amplification of a specific part of the small subunit rRNA gene. Sphingomonads were found on 26 plant species belonging to 11 families. The maximum population number of Sphingomonas was 10(8) g(-1) (wet weight) plant tissue. The maximum population ratio of Sphingomonas to the total aerobic bacteria was 58% when it was counted on glucose-nutrient agar plates. Consistent differences in population number and population ratio were not found among seeds, leaves and flowers. The role of sphingomonads on plant aerial parts is discussed.
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