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首页> 美国卫生研究院文献>Genetics >A genetic map of tomato based on BC(1) Lycopersicon esculentum x Solanum lycopersicoides reveals overall synteny but suppressed recombination between these homeologous genomes.
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A genetic map of tomato based on BC(1) Lycopersicon esculentum x Solanum lycopersicoides reveals overall synteny but suppressed recombination between these homeologous genomes.

机译：番茄的遗传图谱基于BC（1）番茄和番茄茄子揭示了整体同源性但抑制了这些同源基因组之间的重组。

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F(1) hybrids between the cultivated tomato (Lycopersicon esculentum) and the wild nightshade Solanum lycopersicoides are male sterile and unilaterally incompatible, breeding barriers that impede further crosses to tomato. Meiosis is disrupted in 2x hybrids, with reduced chiasma formation and frequent univalents, but is normal in allotetraploid hybrids, indicating the genomes are homeologous. In this study, a partially male-fertile F(1) was backcrossed to tomato, producing the first BC(1) population suitable for genetic mapping from this cross. BC(1) plants were genotyped at marker loci to study the transmission of wild alleles and to measure rates of homeologous recombination. The pattern of segregation distortion, in favor of homozygotes on chromosomes 2 and 5 and heterozygotes on chromosomes 6 and 9, suggested linkage to a small number of loci under selection on each chromosome. Genome ratios nonetheless fit Mendelian expectations. Resulting genetic maps were essentially colinear with existing tomato maps but showed an overall reduction in recombination of approximately 27%. Recombination suppression was observed for all chromosomes except 9 and 12, affected both proximal and distal regions, and was most severe on chromosome 10 (70% reduction). Recombination between markers on the long arm of this chromosome was completely eliminated, suggesting a lack of colinearity between S. lycopersicoides and L. esculentum homeologues in this region. Results are discussed with respect to phylogenetic relationships between the species and their potential use for studies of homeologous pairing and recombination in a diploid plant genome.
机译：F（1）栽培番茄（Lycopersicon esculentum）和野生茄科茄属茄属（Solanum lycopersicoides）之间的杂种是雄性不育且单侧不相容的，繁殖障碍阻碍了进一步与番茄的杂交。减数分裂在2x杂种中被破坏，形成的裂痕减少且频繁出现单价，但在异源四倍体杂种中是正常的，表明基因组是同源的。在这项研究中，部分雄性可育的F（1）与番茄回交，产生了适合此遗传图谱的第一个BC（1）种群。在标记基因座对BC（1）植物进行基因分型，以研究野生等位基因的传播，并测量同源重组的速率。偏向分离的模式，有利于2号和5号染色体上的纯合子和6号和9号染色体上的杂合子，表明与每个染色体上选择的少数基因座相关。尽管如此，基因组比率仍符合孟德尔的期望。所得的遗传图谱与现有的番茄图谱基本共线，但显示重组的总体减少量约为27％。除了9和12号染色体外，所有近端和远端区域都观察到重组抑制，并且在第10号染色体上抑制最为严重（减少70％）。该染色体长臂上的标记之间的重组被完全消除，这表明该区域的S. lycopersicoides和L. esculentum homeologues之间缺乏共线性。就物种之间的系统发育关系及其在二倍体植物基因组中同源配对和重组研究中的潜在用途进行了讨论。

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