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Marker-assisted increase of genetic diversity in a double-low seed quality winter oilseed rape genetic background

机译:双低种子优质冬季油菜遗传背景下的标记辅助遗传多样性增加

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摘要

Generation of novel genetic diversity for maximization of heterosis in hybrid production is a significant goal in winter oilseed rape breeding. Here, we demonstrate that doubled haploid (DH) production using microspore cultivation can simultaneously introgress favourable alleles for double-low seed quality (low erucic acid and low-glucosinolate content) into a genetically diverse Brassica napus genetic background. The DH lines were derived from a cross between a double-low quality winter rapeseed variety and a genetically diverse semisynthetic B. napus line with high erucic acid and high glucosinolates (++ quality). Twenty-three low-glucosinolate lines were identified with a genome component of 50-67% derived from the ++ parent. Four of these lines, with a genome component of 50-55% derived from the ++ parent, also contained low erucic acid. Heterosis for seed yield was confirmed in test-crosses using these genetically diverse lines as pollinator. The results demonstrate the potential of marker-assisted identification of novel genetic pools for breeding of double-low quality winter oilseed rape hybrids.
机译:在冬季油料油菜育种中,实现杂交优势最大化的新遗传多样性的产生是一个重要目标。在这里,我们证明了使用小孢子培养法生产双倍单倍体(DH)可以同时将有利的等位基因导入双低种子质量(低芥酸和低芥子油苷含量)的遗传多样性甘蓝型油菜遗传背景中。 DH系衍生自双低品质冬季油菜品种与遗传上具有高芥酸和高芥子油苷(++品质)的半合成甘蓝型油菜的杂交。鉴定了二十三个低硫代葡萄糖苷系,其基因组成分为++亲本,占50-67%。这些品系中有四个品系的基因组成分为++亲本,其中50%至55%来自低芥酸。使用这些具有遗传多样性的品系作为传粉媒介,在杂交试验中证实了种子产量的杂种优势。结果证明了标记辅助鉴定新型基因库的潜力,可用于培育双低质量冬季油菜油菜杂交种。

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