The effects of high temperatures on soybean nodulation and growth with different strains of bradyrhizobia

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Abstract
The effects on nodulation by diurnally administered high temperatures were studied with soybean (Glycine max (L.) Merr.) and diverse strains of bradyrhizobia. The strains were differentially affected in their symbiotic performances by the higher temperature regimes, and only with the most stressful treatments imposed, 42 °C for 12 h per day and 45 °C for 9 h per day, did some strains fail to nodulate. There was no correlation between the ability of a strain to grow on agar at high incubation temperatures and its ability to nodulate at high temperatures. Effectiveness of a strain at normal temperatures was a more reliable indicator of its symbiotic potential at high temperatures.

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