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Multi-parent QTL mapping reveals stable QTL conferring resistance to Gibberella ear rot in maize
Euphytica ( IF 1.9 ) Pub Date : 2020-12-29 , DOI: 10.1007/s10681-020-02748-x
Ana L. Galiano-Carneiro , Bettina Kessel , Thomas Presterl , David Sewordor Gaikpa , Maria Belen Kistner , Thomas Miedaner

Maize production is on risk by Gibberella ear rot (GER) caused by Fusarium graminearum. This is one of the most important ear rot diseases in temperate zones as it leads to yield losses and production of harmful mycotoxins. We investigated, for the first time, the potential use of Brazilian tropical maize to increase resistance levels to GER in temperate European flint germplasm by analyzing six interconnected biparental populations. We assessed GER symptoms in Brazil and in Europe in up to six environments (= location × year combinations) during the growing seasons of 2018 and 2019. We conducted multi-parent QTL and biparental QTL mapping, and identified four QTLs with additive gene action, each explaining 5.4 to 21.8% of the total genotypic variance for GER resistance. Among them, QTL q1 was stable across test environments, populations, and between inbred lines and testcrosses. The accuracies of genomic prediction ranged from 0.50 to 0.59 depending on the resistance donor and prediction model. Jointly, our study reveals the potential use of Brazilian resistance sources to increase GER resistance levels by genomics-assisted breeding.



中文翻译:

多亲QTL定位揭示了稳定的QTL赋予玉米抗赤霉病性

禾谷镰刀菌引起的赤霉病导致玉米腐烂。这是温带地区最重要的耳腐病之一,因为它会导致产量损失和有害真菌毒素的产生。我们通过分析六个相互联系的双亲种群,首次调查了巴西热带玉米在提高温带欧洲fl石种质中对GER的抗性水平方面的潜在用途。我们在2018年和2019年的生长季节中,在多达六个环境(=位置×年组合)中评估了巴西和欧洲的GER症状。我们进行了多亲QTL和双亲QTL作图,并鉴定了四个具有加性基因作用的QTL,各自解释了GER抵抗的总基因型变异的5.4%至21.8%。其中,QTL q1在测试环境,种群以及自交系和测试杂交之间均稳定。基因组预测的准确性范围为0。50到0.59,取决于阻力提供者和预测模型。我们的研究共同表明,通过基因组学辅助育种,可以利用巴西抗性来源提高GER抗性水平。

更新日期:2020-12-29
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