玉米自交系、远缘杂交种和种间杂种之间的比较重组距离。
Comparative recombination distances among Zea mays L. inbreds, wide crosses and interspecific hybrids.
作者信息
Williams C G, Goodman M M, Stuber C W
机构信息
Department of Forest Science, Texas A&M University, College Station 77843, USA.
出版信息
Genetics. 1995 Dec;141(4):1573-81. doi: 10.1093/genetics/141.4.1573.
Recombination distances and linkage heterogeneity were compared among a wide range of maize inbreds, wide crosses and maize x teosinte hybrids. Twelve maize and four teosinte races were backcrossed to stocks fixed for rare marker alleles on chromosome arm 1L. Recombination fraction estimates were higher for exotic germplasm than for either U.S. maize or maize x teosinte crosses. Serrano, Tuxpeño and a US-adapted inbred line of tropical origin, NC300, exhibited enhanced recombination. Three of the four maize x teosinte hybrids had little or no recombination between two loci. The observed recombination "shrinkage" resulted from an apparent inversion in the vicinity of the Amp1 locus. Average recombination distances among common marker loci for composite maps were highly variable, even when map construction was restricted to maize germplasm of similar origins.
在一系列广泛的玉米自交系、远缘杂交种以及玉米与大刍草杂交种中，对重组距离和连锁异质性进行了比较。将12个玉米品种和4个大刍草种族与固定有1L染色体臂上稀有标记等位基因的品系进行回交。外来种质的重组率估计值高于美国玉米或玉米与大刍草的杂交种。塞拉诺、图克斯佩尼奥以及一个热带起源的适应美国环境的自交系NC300表现出增强的重组。四个玉米与大刍草杂交种中的三个在两个位点之间几乎没有或没有重组。观察到的重组“收缩”是由Amp1位点附近明显的倒位导致的。即使将图谱构建限制在起源相似的玉米种质中，复合图谱中常见标记位点之间的平均重组距离仍高度可变。
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