摘要
对玉米沈综(330)C_1群体分别完成了一轮半姊妹家系和全姊妹家系选择改良。经半姊妹家系选择改良得到的沈综(M_(17))C_2(HC_2)群体和经全姊妹家系选择改良得到的沈综(FS)C_2(FC_2)群体的产量分别比沈综C_0群体提高了12.15％和10.40％,均达到了显著水平;两种改良方法的C_2群体产量之间差异不显著,但FC_2群体主要产量性状比HC_2群体保持了较大的变异范围改良前后群体的变化趋势是:穗部和植株各性状基本上向着有利于产量提高的方向进展;群体内优良个体频率逐轮增加;各性状变异系数有逐轮减少的趋势。群体产量提高的主要原因是对产量影响较大的性状间如行粒数与百粒重,行粒数与穗长间等的关系得到改善,各性状在改良后得到协调发展。
One cycle of half-sib and one cycle of full-sib family recurrent sele- ction were completed separalely in Shenzhong (330) C_1 maize (Zea mays L.) population. The yields of Shenzhong (Mo17) C2 population (HC_2), which was derived from half-sib family selection, and of Shenzhong (FS) C_2 population (FC2), which was detived from full-sib family selection, were 12.15% and 10.4% higher than that of C_■ population respectively; The differences were significant on 0. 05 level in statistics. There was no significant differe- nce between the yields of two C_2 populations, however, the FC2 popula- tion maintained greater variability than than of HC2 in main yield fact- or traits. The trends of population change after improvement were: the traits of ear and plant were basically moving in direction in favor of increasing the yild; the frequency of superior individuals in population increased with each cycle of selection, while the coefficient of varia-bility in characters decreased. The main reason of yield increase in population was that the relationships between essential traits affecting sub- stantially the yield, such as the number of grains per row versus weight of a hundred grains, and the number of grains per row versus ear length, were improved, and these traits developed in a coordinated manner.
出处
《沈阳农业大学学报》
CAS
CSCD
1989年第4期399-406,共8页
Journal of Shenyang Agricultural University
关键词
玉米
群体改良
轮回选择
选种
maize
recurrent selection
population improvement
