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Genetic Mapping and Prediction Analysis of FHB Resistance in a Hard Red Spring Wheat Breeding Population

机译：硬红春小麦育种群体对FHB抗性的遗传定位及预测分析

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摘要

Fusarium head blight (FHB) is one of the most destructive diseases in wheat worldwide. Breeding for FHB resistance is hampered by its complex genetic architecture, large genotype by environment interaction, and high cost of phenotype screening. Genomic selection (GS) is a powerful tool to enhance improvement of complex traits such as FHB resistance. The objectives of this study were to (1) investigate the genetic architecture of FHB resistance in a North Dakota State University (NDSU) hard red spring wheat breeding population, (2) test if the major QTL Fhb1 and Fhb5 play an important role in this breeding population; and (3) assess the potential of GS to enhance breeding efficiency of FHB resistance. A total of 439 elite spring wheat breeding lines from six breeding cycles were genotyped using genotyping-by-sequencing (GBS) and 102,147 SNP markers were obtained. Evaluation of FHB severity was conducted in 10 unbalanced field trials across multiple years and locations. One QTL for FHB resistance was identified and located on chromosome arm 1AL, explaining 5.3% of total phenotypic variation. The major type II resistance QTL Fhb1 only explained 3.1% of total phenotypic variation and the QTL Fhb5 was not significantly associated with FHB resistance in this breeding population. Our results suggest that integration of many genes with medium/minor effects in this breeding population should provide stable FHB resistance. Genomic prediction accuracies of 0.22–0.44 were obtained when predicting over breeding cycles in this study, indicating the potential of GS to enhance the improvement of FHB resistance.
机译：镰刀菌枯萎病（FHB）是全世界小麦中最具破坏性的疾病之一。 FHB抗性的育种因其复杂的遗传结构，环境相互作用导致的大基因型以及高昂的表型筛选成本而受到阻碍。基因组选择（GS）是增强复杂性状（如FHB抗性）改善的有力工具。这项研究的目的是（1）研究北达科他州立大学（NDSU）硬红春小麦育种种群对FHB抗性的遗传结构，（2）测试主要QTL Fhb1和Fhb5是否在其中发挥重要作用繁殖种群； （3）评估GS增强FHB抗性育种效率的潜力。使用测序基因分型（GBS）对来自六个育种周期的439个优良春小麦育种品系进行基因分型，并获得102,147个SNP标记。对FHB严重性的评估是在多年和不同地点进行的10项不平衡现场试验中进行的。鉴定出一个对FHB抗性的QTL，位于QAL臂1AL上，解释了总表型变异的5.3％。 II型主要抗药性QTL Fhb1仅解释了总表型变异的3.1％，在该育种种群中QTL Fhb5与FHB抗性没有显着相关。我们的结果表明，在该繁殖群体中整合具有中/次要作用的许多基因应该提供稳定的FHB抗性。在本研究中对整个繁殖周期进行预测时，可获得0.22-0.44的基因组预测精度，这表明GS可能增强FHB抗性的改善。

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