Abstract
1 Writers found an autotriploid plant of Viola tricolor L. var. hortensis DC. which is grown naturally on the farm.2 In comparison with the sister diploid plant, the triploid plant did not show gigantic form. But on the epidermal tissue of leaf, the cells of this triploid plant were distinctly larger than those of the sister diploid plant.3 By self pollination we could obtain no good seed with this triploid plant, but, by the crosses of 3x (belongs to horticultural race Uls water) ×2x (Super Swiss Giant) and 2x(Pure white) ×3x (Uls water) we could obtain a few good hybrid seeds. The hybrid seeds from 2x×3x showed the influence of pollen plant in their size and coat colour, while with the hybrid seeds from 2x (Pure white) ×2x (Uls water) we could not recognize the influence of pollen plant.4 In diploid plant of V. tricolor we have observed 13 bivalent chromosomes in the heterotypic metaphase, while in this triploid plant we could count 39 chromosomes in a somatic cell. In the heterotypic metaphase of the triploid plant we could observe not only 13 trivalent chromosomes, but also variable number of chromosomes which consisted of trivalent, bivalent, and univalent chromosomes.5 Perhaps this autotriploid has arisen from the fertilization between haploid egg cell and diploid male gamete.
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