变异是甜菜进化的原发性泉源,是选择的物质基础。单靠选择,无从进化,反之亦然。所以,变异和选择是互相联系而又不同的两个进化因素。无论是自然突变,还是人工诱变,其作用就在于产生多样化的遗传结构。而选择则是“不由自主地把突变混乱理出秩序的力量,其作用是创造出新的栽培类型。因此,甜菜变异对选择的影响,必然发生在以下四个水平上。第一、个体变异水平,起主导作用的是遗传突变和基因重组;第二、群体内各种变异的分布和有益基因的频率,起主导作用的是最佳选择办案;第三、隔离效应,起主导作用的是生殖隔离与自然选择或人工选 Mutation is the primary source of evolution of sugar beets, is the material basis of choice. By choice, no evolution, and vice versa. Therefore, variation and choice are two evolutionary factors that are interrelated and different. Whether it is a natural mutation or artificial mutation, its role is to produce a variety of genetic structures. The choice is "uncontrolled disorder disorder out of order power, its role is to create a new type of cultivation.Therefore, beet mutation on the choice of the impact, inevitably occurs in the following four levels.First, the level of individual variation , Plays a leading role in the genetic mutation and genetic recombination; second, the distribution of various mutations within the group and the frequency of beneficial genes, play a leading role in the best choice; third, the isolation effect, the dominant role is to reproduce Isolation and natural selection or manual selection