Beiträge zur Genetik des Photoperiodismus

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Abstract
Colchicine-poly-ploidized autotetraploid specimens of the long-day plant Hyoscyamus niger developed only microscopic floral primordia in response to an 11-hr. day, but blossomed in response to a 13-hr. day. Compared to the diploid ancestral race, the critical day length and the time preceding the elongation of the internodes were shortened, the number of leaves was reduced and the time of flowering was delayed. The critical day length for autotetraploid specimens of the day-neutral plants, H. albus and Antirrhinum maius. was 10-11 hrs.; compared to diploid plants, the number of leaves was not changed in the case of the former and was increased in the case of the latter. In both spp. flowering is hastened by prolongation of the light period; on the other hand, flowering can be induced under an illumination of 9 hrs. if the light intensity is high. In the case of tetraploid specimens of the short-day plant, Xanthium strumarium, the time of flowering is delayed under an illumination of over 14 hrs. and only microscopic floral primordia develop under an illumination of over 18 hrs. Thus diploid and tetraploid plants of the same sp. differ only slightly[long dash]contradictory to the findings of O''Mara and of Ernst.

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