Crown rot of wheat and barley is a serious disease caused by the fungus Fusarium pseudograminearum; a stubble-borne pathogen common in no-till farming systems in many wheat growing regions. Evidence suggests that partial resistance and a degree of tolerance exists in wheat. To assess the relationship between resistance and tolerance, 207 wheat genotypes developed from the same population including parents and check cultivars, were evaluated in the field under crown rot pressure in yield loss experiments. Yield loss was determined in replicated, inoculated and un-inoculated paired plots in 2014 and 2015 and resistance assessed by the extent of stem browning on plants sampled from the same plots grown at Narrabri in northwestern NSW. The population was genotyped using a high-density 90 K SNP array and a genome wide association analysis conducted to identify QTLs for both tolerance and resistance. Transgressive segregation was observed for crown rot resistance and tolerance in the population. Forty-three QTLs were associated with resistance and tolerance traits and 8 previously reported QTLs were confirmed. Comparison of linked marker positions indicated that QTL for yield in the presence of crown rot inoculum located on chromosomes 2B, 2D, 4B, 6A and 6B were previously unreported. Stem browning was effective in determining resistance only and was not associated with tolerance, determined as yield under crown rot pressure or yield loss.

小麦和大麦的冠腐病是由真菌镰刀菌引起的一种严重疾病; 一种在许多小麦种植区的免耕耕作系统中常见的由胡茬传播的病原体。有证据表明，小麦存在部分抗性和一定程度的耐性。为了评估抗性和耐受性之间的关系，在产量损失试验中，在冠腐病压力下，在田间评估了同一种群（包括亲本和检查品种）开发的207个基因型。在2014年和2015年在重复，接种和未接种的配对田中测定产量损失，并通过从新南威尔士州西北的Narrabri种植的相同田地采样的植株褐变程度评估其抗性。使用高密度90 K SNP阵列对人群进行基因分型，并进行全基因组关联分析以鉴定QTL的耐受性和抗性。进行过海隔离对人群的冠腐病抗性和耐受性。43个QTL与耐药性和耐受性相关，确认了8个先前报道的QTL。链接标记位置的比较表明，先前未报道在位于染色体2B，2D，4B，6A和6B上的冠腐病菌存在下产量的QTL。茎褐变仅在确定阻力方面有效，与容差无关，容差取决于冠腐病压力下的产量或产量损失。先前未报告6A和6B。茎褐变仅在确定阻力方面有效，与容差无关，容差取决于冠腐病压力下的产量或产量损失。先前未报告6A和6B。茎褐变仅在确定阻力方面有效，与容差无关，容差取决于冠腐病压力下的产量或产量损失。