Primula malacoides FRANCH. の細胞学的研究(数学及び自然科学)

17 garden varieties and their offsprings of Primula malacoides were studied cytologically. 13 varieties are found to be tetraploids, and 4 varieties, garden primroses cultivated from old, to be diploids (2n=18), and one to be a triploid (2n=27) (Table 1,Fig. 1). In meiosis of tetraploids 18II are shown, but pairing of bivalents is incomplete in general, and separation at anaphase is irregular in some varieties. Some of tetraploid offsprings are found to be aneuploids, somatic numbers being 34,35,37,38 and some of them have abnormal chromosomes (Table 2,3,Fig. 2). These offsprings are dwarf or male sterile, or have abnormal petals. So some of tetraploid varieties are assumed not to be genetically pure. Diploid varieties, on the other hand, exhibited regular meiosis, and chromosome numbers of their offsprings are normal. Triploid plants are found in the cross tetraploid×diploid