一、前言在表示植物的变异中,有染色体数量的变异,即染色体数自然地增减,有倍数性、非整倍性、混倍性的现象。证实了在赤杨属(Alnus)的深山赤杨亚属中,2倍体种的染色体数经过2次加倍的过程,形成了8倍体种。如果看一下日本柳杉的自然多倍体,在苗圃地里出现了4倍体,另外,在造林地或在九州的乡土插穗品种和优树中,都有出现过3倍体的报告。 First, the foreword In that the variation of plants, the number of chromosome variation, the number of chromosomes naturally increase and decrease, a multiple, aneuploidy, mixed phenomenon. It was confirmed that in the genus Alnus, the chromosome number of 2-fold species was doubled after 2 doublings, forming 8-fold species. If you look at the natural polyploidy of Japanese cedar, it appears in the nursery quadruples, and in the afforestation or Kyushu native cuttings and trees, there have been reports of the triploid.