Screening barley germplasm for resistance to a new isolate of barley yellow mosaic virus (BaYMV)

Resistance to a new isolate of barley yellow mosaic virus was evaluated within barley germplasm under field conditions. At Huccorgne, the cultivars 'Comte de Serres', 'Marne', 'Jochiweon covered', 'Mushinchiang3', etc., or lines 'L 541', 'RDA 72.49' are potential sources of resistance against this isolate. In some cultivars or lines, this resistance can be detected using a RFLP marker (MWG10), linked to ym4, the recessive gene conferring resistance to barley yellow mosaic and barley mild mosaic virus. It is shown that in some barley lines resistant to the new isolate, this probe detects an allele of approximately 2.7 kb. In other resistant varieties, the gene involved is independent of ym4. The segregation in the F-2 population of a cross 'L 541' x 'Travelling' showed that resistance in 'L 541' is conferred by a single recessive gene. ((C) Inra/Elsevier, Paris.).