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POSTERS: Genetics of Resistance II

P-270 - Molecular markers associated with resistance to Fusarium root rot in three soybean breeding populations

Tuesday, August 5, 2025
9:30 AM - 10:15 AM HST
Location: Exhibit Hall 3
Abstract Text: Fusarium root rot (FRR) of soybeans can be caused by as many as 19 different species in the fungal genus Fusarium; F. graminearum, F. oxysporum, and F. solani are the species most commonly associated with decayed roots.  This disease results in significant annual economic losses worldwide, especially in North and South America and China. The diversity of the pathogens involved presents challenges that narrow available options to fight this disease complex. Developing resistance to multiple Fusarium species is a desirable goal to mitigate losses to FRR. This study aims to identify sources of genetic resistance to three species of Fusarium using molecular markers. In order to discover genes associated with FRR resistance, we evaluated three soybean populations derived from parental lines demonstrating a range of resistance levels. The soybean populations evaluated were: AXSRC23724: MN1606 X PI 567649, AXSRC23727: MN1606 X PI 437563, and AX22782: RIPLEY X MN1606, in which extensive SNP marker mapping has already been conducted. Sixty recombinant inbred lines showing resistant reactions were selected from the three soybean populations previously evaluated phenotypically for severity and disease severity index (DSI). This work helps to advance the understanding of the underlying genetic basis of soybean resistance to FRR, where molecular markers associated with resistance loci can be helpful in soybean breeding programs to develop durably resistant soybean cultivars.