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Nature Genetics:上位性效应在冬小麦籽粒产量杂种优势中的作用

已有 3617 次阅读 2017-10-24 08:24 |个人分类:每日摘要|系统分类:科研笔记

A quantitative genetic framework highlights the role of epistatic effects for grain-yield heterosis in bread wheat


First author:Yong Jiang; Affiliations: Leibniz Institute of Plant Genetics and Crop Plant Research (莱布尼茨植物遗传和作物研究所): Gatersleben, Germany

Corresponding author: Jochen C Reif


Increasing wheat yield is a key global challenge to producing sufficient food for a growing human population. Wheat grain yield can be boosted (增加) by exploiting heterosis, the superior performance of hybrids compared with midparents. Here we present a tailored quantitative genetic framework to study the genetic basis of midparent heterosis in hybrid populations derived from crosses among diverse parents. We applied this framework to an extensive data set assembled for winter wheat (冬小麦). Grain yield was assessed for 1,604 hybrids and their 135 parental elite breeding lines in 11 environments. The hybrids outperformed (胜过) the midparents by 10% on average, representing approximately 15 years of breeding progress in wheat, thus further substantiating (用事实支持) the remarkable potential of hybrid-wheat breeding. Genome-wide prediction and association mapping implemented through the developed quantitative genetic framework showed that dominance effects (显性效应) played a less prominent role than epistatic effects (上位性效应) in grain-yield heterosis in wheat.


为了应对世界不断增长的人口,我们需要不断提高小麦的产量以保证充足的食物来源。杂种优势可以用来增加小麦的产量。本文开发了一套特制的数量遗传框架以研究源于多种亲本杂交形成的杂交群体中杂种优势遗传基础。作者利用这套方法对冬小麦各种数据集进行了研究。对生长在11个环境地点的1,604杂种及其135亲本育种株系进行了产量评估。杂交种的产量要超过亲本平均的10%,这也代表了15年的育种进程取得的成果,用事实证明了杂交小麦育种的潜在能力。通过数量遗传框架进行的全基因组预测和关联图谱分析显示在小麦产量的杂种优势中上位性效应要比显性效应的作用更加明显。


通讯:Jochen C Reif (http://www.ipk-gatersleben.de/en/breeding-research/)



研究方向:作物育种


doi: 10.1038/ng.3974


Journal: Nature Genetics
Published online: October 16, 2017.

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