Survival of Rhizobium trifolii strains on inoculated seed held at 35°C

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Abstract
Fifteen R. trifolii strains, selected from 62 isolations from naturalized white clover (Trifolium repens) plants on the far north coast of New South Wales [Australia] were tested for their tolerance to high temperature. They were compared with TA1 (the current commercial strain) and CC275e, when used as peat cultures to inoculate seed held at 35.degree. C. TA1 showed the most rapid decline and its death rate was significantly higher than that of all except one of the isolates. CC275e showed good survival, and its death rate was similar to the lowest in 2 out of the 3 groups in which it was included. Differences between local isolates were small except for 2 which showed poorer survival.

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