Abstract
Measurements of auxin and cytokinin activities in extracts ofCasuarina root nodules were made. The nodules were induced either by pure culture ofFrankia strain CgI4 or by crushed nodule inoculum. Levels of cytokinin activity were significantly higher in root nodules induced by pureFrankia culture than in those induced by crushed nodule inoculum. However, the reasons for this are unknown. Seasonal variation in levels of cytokinin activity inCasuarina nodules has also been detected.
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