Abstract
Summary Germination success of seeds of Phaseolus vulgaris L. cv. Limburg was studied as a function of the time of onset of imbibition. Mean radicle length and mean radicle weight after 48 h germination in darkness varied regulary with a period length of approximately 6 hours, revealing ultradian rhythmicity. A long-term study covering 20 months showed an underlying circannual rhythmic component.
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