SCAR and RAPD markers associated with 18-carbon fatty acids in rapeseed, Brassica napus

文献类型： 外文期刊

第一作者： Hu, J

作者： Hu, J;Li, G;Struss, D;Quiros, CF

作者机构：

关键词： Brassica napus;canola;DNA-based markers;fatty acids;gene-tagging;mapping

期刊名称：PLANT BREEDING （ 影响因子：1.832； 五年影响因子：1.956 ）

ISSN： 0179-9541

年卷期： 1999 年 118 卷 2 期

页码：

收录情况： SCI

摘要： Breeding rapeseed for enhanced oil quality includes the development of varieties with low linolenic acid content. The breeder also aims to develop varieties with a high linoleic acid content because of its nutritional value. Restriction fragment length polymorphism (RFLP) and random amplified polymorphic DNA (RAPD) markers have been developed for linolenic acid content, but they are not best suited for a direct application in marker-assisted selection. The RFLP technique is too complex and time-consuming and RAPD markers lack codominance, precluding the distinction of homozygous from heterozygous individuals. In this report the conversion of a RAPD marker to a codominant sequence characterized amplified region (SCAR) marker named L1L9 is described. One of the alleles consisting of an 899 bp fragment (allele A), is associated with low linolenic acid content. The other allele consists of an 641 bp fragment (allele B) and is associated with high linolenic acid content. This marker explains approximately 25% of the genetic variation for this trail. Linkage analysis in the mapping population indicates that the SCAR marker probably tags an omega-3 desaturase gene in B. napus. Two RAPD markers were found to be associated with oleic/linoleic acid content. Markers M14-350 and 106-650 explained approximately 10% and 7% of the genetic variation for linoleic acid content, respectively. These two markers a ere found linked at 12.3 cM in the segregating B. napus F-2 progeny used for mapping. All the markers reported in this paper should be useful in breeding programmes for developing high linoleic and low linolenic acid rapeseed varieties.

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