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THE MUTUAL GROWTH OF ARTHROBACTER GLOBIFORMIS AND PSEUDOMONAS FLUORESCENS IN GAMMA-STERILIZED SOIL

P. O. SALONIUS, J. B. ROBINSON and F. E. CHASE
Plant and Soil
Vol. 32, No. 2 (April 1970), pp. 316-326
Published by: Springer
Stable URL: http://www.jstor.org/stable/42935822
Page Count: 11
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THE MUTUAL GROWTH OF ARTHROBACTER GLOBIFORMIS AND PSEUDOMONAS FLUORESCENS IN GAMMA-STERILIZED SOIL
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Abstract

Arthrobacter globiformis and Pseudomonas fluorescens were grown separately and together in flasks containing soil sterilized by gamma-irradiation. If the soil was held at 60% of its waterholding capacity (W.H.C.) and 25°C the viable cell yield of the 2 organisms in pure culture was approximately equal in 4 days while in mixed culture neither organism predominated and the total yield was about the same as in either pure culture. The pseudomonad dominated the mixed cultures when the incubation temperature was 10°C, when the soil was saturated and when glucose was added to the soil. The arthrobacter dominated the mixed culture when soil moisture was decreased to 40% W.H.C. The 10-day oxygen uptake by the 2 organisms grown together in sterile soil was much less than that shown by an inoculum prepared from a soil dilution. A. globiformis took up less oxygen when grown in the sterile soil than did P. fluorescens. In these short-term experiments A. globiformis did not demonstrate competitive capabilities which would explain its more frequent occurrence in unamended soil than P. fluorescens.

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