Multiple-line cross QTL mapping for grain yield and thousand kernel weight in triticale

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• 作者：Wenxin Liu ; Willmar L. Leiser ; Jochen C. Reif ; Matthew R. Tucker ; Dominik Losert ; Sigrid Weissmann ; Volker Hahn ; Hans Peter Maurer and Tobias Wü ; rschum
• 刊名：Plant Breeding
• 出版年：2016
• 出版时间：October 2016
• 年：2016
• 卷：135
• 期：5
• 页码：567-573
• 全文大小：649K
• ISSN：1439-0523

文摘

Grain yield and its component trait thousand kernel weight are important traits in triticale breeding programmes. Here, we used a large mapping population of 647 doubled haploid lines derived from four families to dissect the genetic architecture underlying grain yield and thousand kernel weight by multiple-line cross QTL mapping. We identified 3 QTL for grain yield and 13 for thousand kernel weight which cross-validated explained 5.2% and 48.2% of the genotypic variance, respectively. Both traits showed a positive phenotypic correlation, and we found two QTL overlapping between them. Full two-dimensional epistasis scans revealed epistatic QTL for both traits, suggesting that epistatic interactions contribute to their genetic architecture. Based on QTL identified in our results, we conclude that the potential for marker-assisted selection is limited for grain yield but more promising for thousand kernel weight.