LIPM, Université de Toulouse, INRA, CNRS, Castanet-Tolosan, France.
Florimond Desprez Veuve & Fils SAS, BP41, 3, Rue Florimond Desprez, 59242, Capelle-en-Pévèle, France.
Theor Appl Genet. 2019 Nov;132(11):3063-3078. doi: 10.1007/s00122-019-03406-0. Epub 2019 Sep 4.
The comparison of QTL detection performed on an elite panel and an (elite [Formula: see text] exotic) progeny shows that introducing exotic germplasm into breeding programs can bring new interesting allelic diversity. Selection of stable varieties producing the highest amount of extractable sugar per hectare (ha), resistant to diseases, and respecting environmental criteria is undoubtedly the main target for sugar beet breeding. As sodium, potassium, and [Formula: see text]-amino nitrogen in sugar beets are the impurities that have the biggest negative impact on white sugar extraction, it is interesting to reduce their concentration in further varieties. However, domestication history and strong selection pressures have affected the genetic diversity needed to achieve this goal. In this study, quantitative trait locus (QTL) detection was performed on two populations, an (elite [Formula: see text] exotic) sugar beet progeny and an elite panel, to find potentially new interesting regions brought by the exotic accession. The three traits linked with impurities content were studied. Some QTLs were detected in both populations, the majority in the elite panel because of most statistical power. Some of the QTLs were colocated and had favorable effect in the progeny since the exotic allele was linked with a decrease in the impurity content. A few number of favorable QTLs were detected in the progeny, only. Consequently, introgressing exotic genetic material into sugar beet breeding programs can allow the incorporation of new interesting alleles.
对精英群体和亲本（精英[公式：见文本]外来）后代进行的 QTL 检测比较表明，将外来种质资源引入到育种计划中可以带来新的有趣的等位基因多样性。选择每公顷（ha）产生最高量可提取糖、抗病和尊重环境标准的稳定品种，无疑是甜菜育种的主要目标。由于甜菜中的钠、钾和[公式：见文本]-氨基酸氮是对白砂糖提取影响最大的杂质，因此降低其在进一步品种中的浓度是很有趣的。然而，驯化历史和强烈的选择压力影响了实现这一目标所需的遗传多样性。在这项研究中，对两个群体（亲本（精英[公式：见文本]外来）甜菜后代和一个精英群体）进行了数量性状基因座（QTL）检测，以发现外来品系带来的潜在的新的有趣区域。研究了与杂质含量相关的三个性状。在两个群体中都检测到了一些 QTL，大多数在精英群体中，因为统计能力更强。一些 QTL 在后代中发生了共定位，并且具有有利的影响，因为外来等位基因与杂质含量的降低有关。在后代中只检测到少数有利的 QTL。因此，将外来遗传物质导入甜菜育种计划可以允许新的有趣等位基因的掺入。
