Abstract
The effects of low pH on the growth and survival of root nodule bacteria are important in determining the success of legume inoculation in practical agriculture. The mechanisms for maintenance of intracellular pH (pHi) are crucial, but little is yet known about them in root nodule bacteria. Like other Gram-negative bacteria, root nodule bacteria show an adaptive acid tolerance response, with growth at moderately acidic conditions protecting against an extreme acid shock. Variations in acid tolerance within species of root nodule bacteria imply a genetic basis to low pH tolerance and studies of acid-sensitive mutants suggest that as many as 20 genes could be involved. A general model for acid tolerance in root nodule bacteria is presented.
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