1) In 1949, two tetraploid plants were obtained by O.4 per cent colchicine treatment of young seedling of hedionda. The result of morphological and cytological studies on the tetraploid plant is described, comparing with those of the original diploid plant. 2)The morphological characters of the tetraploid plant increased in size over those of the diploid one, showing so-called gigas type. The tetraploid plant bloomed remarkably later than the diploid plant. 3) The somatic chromosome number of the diploid plant used was 2n=28, that of the artificial tetraploid being 2n=56. 4) At the first metaphase of the reduction division of the diploid plant, 14 chromosomes were counted, the chromosome behaviour being very regular. 5) In tetraploid, frequency of the tetravalents was 10.095±2.692 at diakinesis and 9.302±3.282 at M-I. The tetravalents observed at diakinesis and M-I were in the shape of rillg, X, chain, Y or others. The fertility of the tetraploid hedionda was considerably higher than that of the tetraploid wild senna.
筆者は, さきに, コルヒチン処理によるエビスグサ(Cassia Tora L. )の人為四倍体の育成経過, 形態的特性並びに細胞学的観察等について報告した(片山1953). ハブソウについても同様に, 人為倍数体の育成を試み, 2個の倍数個体を得た. この倍数体の移動期, 中期に観られた四価染色体の頻度は, エビスグサの場合とはやや異る結果を示した. ここにその結果を報告する.
Mendeley出力
