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Mapping Quantitative Trait Loci for Type II Fusarium Head Blight Resistance in Two Wheat Recombinant Inbred Line Populations Derived from Yangmai 4 and Yangmai 5.

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Fusarium head blight (FHB) is a destructive wheat disease worldwide and significantly affects grain yield and quality in wheat. To understand the genetic basis underlying type II FHB resistance in… Click to show full abstract

Fusarium head blight (FHB) is a destructive wheat disease worldwide and significantly affects grain yield and quality in wheat. To understand the genetic basis underlying type II FHB resistance in two elite wheat cultivars Yangmai 4 (YM4) and Yangmai 5 (YM5), quantitative trait loci (QTL) mapping was conducted in two recombinant inbred lines (RIL) populations derived from the crosses of YM4 and YM5 with susceptible cultivar Yanzhan 1 (YZ1), respectively. Survey with markers linked to Fhb1, Fhb2, Fhb4, and Fhb5 in landrace Wangshuibai indicated the non-existence of these known FHB resistance genes/QTL in YM4, YM5, and YZ1. One overlapped resistance QTL was identified in both RIL populations, namely QFhb.Y4.2D/QFhb.Y5.2D, with a large effect on FHB resistance. One novel resistance QTL QFhb.Y4.5A mapped on chromosome 5A was detected only in YM4/YZ1 population. The resistance alleles of both QFhb.Y4.2D/QFhb.Y5.2D and QFhb.Y4.5A did not increase the plant height and did not significantly affect the heading date and flowering date. Kompetitive Allele-Specific PCR markers for QFhb.Y4.2D/QFhb.Y5.2D and QFhb.Y4.5A had been developed to verify in an additional set of 244 geographically diverse cultivars/lines. Pyramiding of the two resistance alleles decreased the percentage of symptomatic spikelets by 51.77% relative to the cultivars/lines without these two resistance alleles. QFhb.Y4.2D/QFhb.Y5.2D and QFhb.Y4.5A were shown to be useful alternatives in FHB resistance breeding programs. The results will facilitate the marker-assisted selection for introgression of the favorable alleles for improving FHB resistance in breeding programs.

Keywords: wheat; fhb resistance; head blight; fusarium head; qfhb qfhb; resistance

Journal Title: Plant disease
Year Published: 2022

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