Repeatability and heritability of divergent recombination frequencies in the Iowa Stiff Stalk Synthetic (Zea mays L)
Repeatability and heritability of divergent recombination frequencies in the Iowa Stiff Stalk Synthetic (Zea mays L)
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DOI：
10.1007/bf00224103
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发表时间：
1996-10-01
影响因子：
5.4
通讯作者：
Poneleit, CG
中科院分区：
文献类型：
--
作者：
Hadad, RG;Pfeiffer, TW;Poneleit, CG
重组频率的变异性在爱荷华州Stiff Stalk合成中被重新分配。本研究的目的是验证爱荷华州硬茎合成玉米群体中个体间重组频率的差异，并确定S-1后代中重组频率差异是否持续存在。对8个So个体重复测交以测量3条染色体（4，sul-c2; 5，a2-bt 1-pr 1; 9，sh 1-bz 1-wx 1）上的雄性重组频率。根据特定染色体上重组频率的高低选择的个体，其重组频率在个体间存在重复性差异。个体已被选定为长和短的总地图距离在三个染色体区域产生可重复的不同重组频率仅在sul-c2区域。由单个染色体上重组频率差异最大的S-0个体衍生的S-1系的重组频率差异显著。6个S-0个体对6个S-1品系的广义遗传力估计值在0.69 ~ 0.20之间。我们的结论是，重组频率的遗传差异存在于这个群体中，通过选择的修改应该是可能的。
Variability in recombination frequency was re parted in the Iowa Stiff Stalk Synthetic. The objectives of the present research were to verify the differences in recombination frequency among individuals in the Iowa Stiff Stalk Synthetic maize population and to determine if the recombination frequency differences persisted among the S-1 progeny. Testcrosses to measure male recombination frequency on three chromosomes (4, sul-c2; 5, a2-bt1-pr1; 9, sh1-bz1-wx1) were repeated for eight So individuals. Recombination frequencies were repeatably divergent among those individuals which were selected based on high or low recombination frequencies on specific chromosomes. Individuals which had been selected for long and short total map distances across the three chromosome regions produced repeatably divergent recombination frequencies only at the sul-c2 region. The recombination frequencies of the S-1 lines, derived from the S-0 individuals which had the most divergent recombination frequencies on a single chromosome, were significantly different. The broad-sense heritability estimates derived from the regression of six S-1 lines on six S-0 individuals ranged from 0.69 to 0.20 for the five chromosome regions. We conclude that genetic differences for recombination frequency exist in this population and that modification by selection should be possible.