摘要
应用NC Ⅱ交配设计,研究分析了四川省1991和2001年优质蛋白玉米9个农艺性状的遗传参数。结果表明,自交系总体在大多数性状上仍保持丰富的遗传变异,有继续改良利用的潜力。一般配合力方差占遗传方差的比重大于55%的性状包括产量、穗行数、百粒重、穗粒重和株高;行粒数、每株穗数和抽丝期性状一般配合力方差占遗传方差的比重在30 03%～47 26%之间。值得注意的是,产量性状的加性方差有降低的趋势,遗传基础可能变窄。本文还结合国内外的研究和育种实践,讨论优质蛋白玉米育种存在的问题与对策。
In 1991 and 2001,analysis of genetic parameter was carried out for 9 agronomic traits of quality protein maize(QPM) by using NCII design. The results indicated that the genetic variability of most traits was significant,and could be effectively utilized for QPM improvement.Of some traits such as yield,kernel rows,100kernel weight,grain wt./ear and plant height,the ratios of σ2gca to δ2g were more than 55?%.For the rest traits,the ratios of δ2gca to δ2g were about 3003?%-4726?%.Special attention should be paid to the decrease of additive variance for yield trait,because this trend was the most possibly accompanied by genetic base narrow.In this paper,several problems encountered with QPM development were discussed,and some solutions were given out on the basis of studies and breeding practices.
出处
《西南农业学报》
CSCD
2003年第3期6-10,共5页
Southwest China Journal of Agricultural Sciences
基金
四川省科技厅"十五"科技攻关项目
