• Ensuring faithful homologous recombination in allopolyploids is essential to maintain optimal fertility of the species. Variation in the ability to control aberrant pairing between homoeologous chromosomes in Brassica napus has been identified. The current study exploited the extremes of such variation to identify genetic factors that differentiate newly resynthesised B. napus, which is inherently unstable, and established B. napus, which has adapted to largely control homoeologous recombination.
• A segregating B. napus mapping population was analysed utilising both cytogenetic observations and high‐throughput genotyping to quantify the levels of homoeologous recombination.
• Three quantitative trait loci (QTL) were identified that contributed to the control of homoeologous recombination in the important oilseed crop B. napus. One major QTL on BnaA9 contributed between 32 and 58% of the observed variation. This study is the first to assess homoeologous recombination and map associated QTLs resulting from deviations in normal pairing in allotetraploid B. napus.
• The identified QTL regions suggest candidate meiotic genes that could be manipulated in order to control this important trait and further allow the development of molecular markers to utilise this trait to exploit homoeologous recombination in a crop.

中文翻译：

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染色体A9的主要数量性状基因座BnaPh1控制甘蓝型油菜的同源重组

• 确保同种多倍体中的忠实同源重组对于维持该物种的最佳繁殖力至关重要。已经确定了控制甘蓝型油菜同源染色体之间异常配对的能力的变化。目前的研究中利用这种变化的极值，以确定区分新resynthesised遗传因素欧洲油菜，其是内在不稳定，并建立了欧洲油菜，其已经适于在很大程度上控制部分同源重组。
• 利用细胞遗传学观察和高通量基因分型对分离的甘蓝型油菜作图种群进行了分析，以量化同源重组的水平。
• 确定了三个定量性状基因座（QTL），它们有助于控制重要油料作物甘蓝型油菜的同源重组。BnaA9的一个主要QTL贡献了观察到的变异的32％至58％。这项研究是第一个评估同源重组和定位相关的QTLs的QTLs，这些QTLs是由异源四倍体甘蓝型油菜正常配对的偏差引起的。
• 鉴定出的QTL区域建议候选减数分裂基因，可以控制该减数分裂基因，以控制该重要性状，并进一步开发分子标记，以利用该性状来利用作物中的同源重组。