USWBSI Abstract Viewer

2022 National Fusarium Head Blight Forum


Variety Development and Host Resistance (VDHR)

Poster # 158

Releasing Lines Pyramided with Fhb1 and Fhb7

Authors & Affiliations:

Binod Gyawali1 and Mohsen Mohammadi1
1. Department of Agronomy, Purdue University, West Lafayette, IN
Corresponding Author: Mohsen Mohammadi, mohamm20@Purdue.edu

Corresponding Author:

Mohsen Mohammadi
mohamm20@purdue.edu

Abstract:

Fusarium graminearum is the causative agent of Fusarium head blight (FHB) in hexaploidy wheat (Triticum aestivum) which substantially reduces the crop yields and quality. Yield loss is mainly caused by the kernel size reduction and sterility of infected spikelets while the quality loss is caused by the presence of mycotoxins primarily deoxynivalenol (DON). Development of disease resistant crops by deploying host resistance genes is one of the effective approaches for the FHB management. Many genetic loci were reported to contribute to resistance to FHB resistance, including Fhb1. Fhb7, a major QTL for FHB resistance in wheat, has been introgressed into soft red winter wheat (SRWW) at Purdue University. Being an exotic QTL, Fhb7 is associated with the linkage drag impacting agronomic and end-use quality performances. This poster explains the breeding scheme for introducing and pyramiding Fhb7 into breeding materials that already had Fhb1. In the final step of product development, we tested 57 SRWW lines which were advanced through the breeding programs to homozygosity by using PCR diagnosis markers, which revealed that 9 out of 57 showed the presence of both Fhb7 and Fhb1. The expectation is that the stack of Fhb1-Fhb7 offers additional genetic protection to SRWW against FHB disease. Fhb7-positive lines showed average agronomic and superior FHB performance. In particular, they expressed low severity and DON content. The release of selected wheat breeding lines with the information of multiple genetic markers linked FHB resistant QTL will be a useful resource for our national USWBSI breeding community for incorporation of this novel genetic resistance into their breeding materials. 


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