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Acid Tolerance of Rhizobium Trifolii in Culture Media¹

ABSTRACT

Tolerance to acidity (pH 4.2 to 4.6), low P (1 to 6 µM) and high Al (15 to 40 µM) for 100 strains of Rhizobium trifolii was assessed in liquid culture media in the laboratory. Response to acidity and Al varied among strains as evidenced by lower maximum cell densities and reduced growth rates, most preceded by a lag phase. Tolerance to acidity did not imply tolerance to Al in all cases. Strains were capable of tolerating higher levels of Al if acidity were reduced. Limitations in rhizobial growth due to low P concentrations were not as severe a stress as high acidity or high Al concentration.

¹ Contribution from the Dep. of Forestry, North Carolina State Univ., Raleigh, NC 27650. Paper no. 8363 of the journal series, North Carolina Agric. Res. Serv., Raleigh.

² Formerly Graduate Research Assistant, Dep. of Forestry, North Carolina State Univ., currently Post-Doctoral Fellow, Dep. of Biological Sciences, Univ. of Waikato, Hamilton, New Zealand; and Professor, Dep. of Forestry and Dep. of Soil Science, North Carolina State Univ.

Received for publication June 16, 1982. Accepted for publication June 5, 1983.