摘要
甘蔗杂种后代的实生苗阶段及其无性系阶段性状的通径分析表明,在一定范围内,茎数不但是决定蔗产量的最重要组分,而且是决定糖产量的最重要组分.2年各性状对蔗产量和糖产量的效应基本相同,表明其遗传本质(基因型)受环境因素的影响不大.茎数的选择响应和前后2年的相关程度最高(r=0.8753,r^2=0.7661),说明茎数在无性系世代中是稳定的.育种上,在一定范围内对茎数的选择效果较好.
The path analyses on characters of crossbred progenies of sugarcane in seedling stage(first year)and their clone stage(second year) showed that stalk number was the most important component to both cane yield and sugar yield.The effects of characters on cane yield and Sugar yield were similar in two years.That showed there characters maitained basically itself hereditary constitution(gene type)in second year and the selection was precise.The heritability is higher and its selection response is the highest for stalk number.However,the heritability is high,but its sel- ection response is lowest for brix only 1/8 vs stalk number.The correlation coefficient and determination coefficient are the highest for stalk number from seedling vs its clone.
关键词
甘蔗
杂种后代
性状
通径分析
选择
sugarcane
crossbred progenies
character
path analyses
selection response
heritability
