Punjab Agricultural University, 141 004, Ludhiana, India.
Theor Appl Genet. 1984 Dec;69(2):179-86. doi: 10.1007/BF00272892.
The present study was undertaken to obtain information on average gene frequency in two heterotic populations of maize (Zea mays L.), Mezcla Amarillo Selection (MAS) and J607. Sixty-four male plants were taken in each of the populations and each of these were crossed to a different set of eight plants, four of which belonged to the same population and four to the other population. This resulted in two groups of intra-population (within MAS and within J607) and two groups of inter-population (MAS X J607 and J607 X MAS) progenies. Each group consisted of 256 full-sib progenies on the pattern of the North Carolina Design I mating system. The male plants were selfed to produce 64 S1 prgenies in each population. The materials were evaluated at two diverse locations, Ludhiana and Gurdaspur, for grain yield, ear length, ear girth, number of kernel rows, plant height, ear height and days to silk. An incomplete block design with two replications were used. The plot consisted of a 5 m long row. Ratios of estimated genetic components of variance and covariance were compared with corresponding theoretical ratios computed for a single locus for various gene frequencies and levels of dominance, and approximate ranges of the gene frequencies and their relative magnitude were worked out in the two populations. The average frequency of favourable genes for plant height was estimated as 0.6 in MAS and 0.8 in J607. For grain yield the average gene frequency was 0.8 to 0.9 in MAS and 0.7 to 0.8 in J607 whereas for ear height it was 0.5 to 0.7 in MAS and 0.4 to 0.6 in J607. The gene frequency in the two populations seemed to be similar for days to silk, ear length, ear girth and kernel rows.
本研究旨在获取两个玉米杂种群体（Zea mays L.）——Mezcla Amarillo Selection（MAS）和 J607 的平均基因频率信息。每个群体中选择了 64 株雄性植物，每株雄性植物与另一组 8 株不同的植物杂交，其中 4 株来自同一群体，4 株来自另一群体。这导致产生了两组自交群体（MAS 内和 J607 内）和两组杂交群体（MAS X J607 和 J607 X MAS）。每个群体都按照北卡罗来纳设计 I 交配系统的模式，由 256 株全同胞后代组成。雄性植物自交，每个群体产生 64 株 S1 后代。材料在 Ludhiana 和 Gurdaspur 两个不同地点进行了谷物产量、穗长、穗粗、行数、株高、穗位高和吐丝天数的评估。采用了具有两个重复的不完全区组设计。该小区由一条 5 米长的行组成。对于各种基因频率和显性水平，将估计遗传方差和协方差的比值与单基因座的相应理论比值进行比较，并在两个群体中计算出基因频率的近似范围及其相对大小。MAS 中有利于株高的有利基因平均频率估计为 0.6，J607 中为 0.8。对于谷物产量，MAS 的平均基因频率为 0.8 到 0.9，J607 为 0.7 到 0.8，而对于穗位高，MAS 为 0.5 到 0.7，J607 为 0.4 到 0.6。对于吐丝天数、穗长、穗粗和行数，两个群体的基因频率似乎相似。
