Zur Physiologie der endogenen Jahresrhythmik in Pflanzen, speziell in Samen

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Abstract
Tests of seeds of numerous spp. showed that there are several spp. in which the annual rhythm of viability and rapidity of germination previously found by different authors is clearly recognizable. The rhythm is more evident in germination in the dark than in germination in light. The same processes evidently are the basis of the yearly rhythm in the viability of seeds as of the yearly rhythm that is known for deciduous trees, detached winter buds, etc. One of the most important reasons for this assumption is the fact that the inner annual rhythm in seeds begins with the same phase in which the mother plant is at the time of seed ripening. Many of the so-called after ripening phenomena are merely a segment of the endogenous annual rhythm. In seeds that have ripened very early, i.e., at a time when the mother plant is still in the period of active elongation, there is, accordingly, a certain readiness to germinate which declines in a few weeks. The location in time of the readiness of seeds to germinate coincides with the location in time of the readiness for elongation of organs laid down in the buds of the mature plant.

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