A Dominant Gene for Resistance to Wheat Streak Mosaic Virus in Winter Wheat Line CO960293‐2

Abstract

Wheat streak mosaic (WSM), caused by Wheat streak mosaic virus (WSMV), is a devastating disease in wheat (Triticum aestivum L.) in the Great Plains of North America. Use of resistance is an effective and environmentally sound method to control the disease. In this study, six wheat genotypes were compared for their responses to WSMV infection under growth chamber conditions. The three resistant genotypes, KS96HW10‐3 (Wsm1), Mace (Wsm1), and CO960293‐2, had disease scores significantly lower than the remaining three genotypes without major resistance. Disease in TAM 111 and TAM 112 was consistently less severe than Karl 92. A population consisting of 188 F2:3 families derived from the cross CO960293‐2 × TAM 111 was used for determining inheritance of the WSMV resistance and for molecular mapping of the resistance in CO960293‐2. Data on segregation of resistance indicated that the resistance in CO960293‐2 is conditioned by a single dominant gene, which was named Wsm2 Transgressive segregation toward susceptibility occurred in the population suggesting a minor gene in the moderately susceptible parent TAM 111, which was not allelic to Wsm2. Wsm2 was mapped to the short arm of chromosome 3B with two flanking simple sequence repeat markers. The single dominant gene inheritance for WSMV resistance in CO960293‐2 has been consistent with the observations that the resistance can be readily transferred to adapted cultivars.

Effects of Single and Double Infections of Winter Wheat by Triticum mosaic virus and Wheat streak mosaic virus on Yield Determinants

“…Another WSMV management strategy is the use of host resistance. Only a few winter wheat cultivars with highly effective resistance to WSMV are available (8,11,22) and some wheat lines with resistance to the disease have recently been identified (20,30). Cultivars with moderate resistance to WSMV have not been reported.…”

Resistance to Wheat streak mosaic virus identified in synthetic wheat lines

“…Previous studies have shown that Wsm1, Wsm2, and an unnamed gene in KS03HW12 (Siefers et al 2007) are ineffective at temperatures above 22 o C (Seifers et al 1995;Lu et al 2011). …”

“…Greenbug (Lage et al 2002) and stem rust resistance (Ma et al 1995) were also on the D genome. However, the naturally occurring gene, Wsm2, was mapped to the B genome (Lu et al 2011) and the other genes Wsm1 and Wsm3 are intergenic transfers from wheatgrass.…”

Introgression of chromosome segments from multiple alien species in wheat breeding lines with wheat streak mosaic virus resistance

“…Our lines (Table 1) have undergone interspecific hybridisation stress that may cause heritable changes to epigenetic marks. Development of resistance in originally WSMV-susceptible lines has shown that WSMV-resistance genes in wheat cultivars might be present but unexpressed (Lu et al, 2011;Seifers et al, 2013). The expression of these genes could be modulated and controlled by genes, transcription factors or chromatin regulators from the alien chromosome segments.…”

“…intermedium chromosome 4Ai#2, and offers effective field resistance to WSMV in wheat (Chen et al, 2003;Friebe et al, 2009). The Wsm2 gene (of unknown origin, but perhaps from bread wheat itself) was mapped to the short arm of wheat chromosome 3B (Lu et al, 2011). A third Th.…”