利用杂种优势使作物大面积丰产已是无容置疑的事情,对于收获营养体块根的甜菜来说,杂种优势也是十分明显的。目前国内外应用较为普遍的甜菜多倍体品种即是杂种优势利用最有说服力的例子之一。产生优势与否,绝非仅限于二倍体与四倍体亲本细胞染色体的杂交,在染色体数目同为二倍体的情况下也可创造出较高的优势水平。杂种优势的高低主要取决于亲本间遗传上的差异大小和杂交率的高低。为了获得完全杂交的具有较高优势的杂种种子,我国继开展甜菜多 It is no doubt that the use of heterosis to large-scale crop production has been undoubted, for the harvest of tubers of sugar beet root heterosis is also very obvious. At present, the most commonly used sugarbeet polyploid variety at home and abroad is one of the most convincing examples of heterosis utilization. Generated advantage or not, by no means limited to diploid and tetraploid parental cell chromosome hybridization, in the same chromosome number of diploid cases can also create a higher level of predominance. The level of heterosis depends mainly on the genetic differences between the size of the parents and the rate of hybridization. In order to obtain hybrid seeds with high heterosis, our country carried out more beet