The genetics of seedling resistance to leaf rust,Puccinia hordeiOtth.in some spring barley cultivars

✍ Scribed by J. E. Parlevliet

• Publisher: Springer
• Year: 1976
• Tongue: English
• Weight: 292 KB
• Volume: 25
• Category: Article
• ISSN: 0014-2336
• DOI: 10.1007/bf00041555

✦ Synopsis

The three Dutch isolates studied carried virulence genes against the resistance genes Pa, Pa-2, Pu-4 and Pa-5. substantiating the widespread occurrence of these virulences in Western Europe as reported by others. The cultivars Cebada Capa, La Estanzuela, Gondar and Dabat carry the same dominant to semi-dominant gene, which is also found in Forrajera Klein and H2212. It is proposed to designate this gene Pa-7. This gene segregated independently from the Pa-3 gene in Rika × (Baladi /~ Rika) substantiating the data of JOHNSON ( 1968), but disagreeing with those of ROAN~ & STARLING (1970). EP 75 seems to carry a single dominant or semi-dominant gene conferring an intermediate resistance to the isolates used. This gene, tentatively designated as Pa-z, is different from the Pa, Pa-2, Pa-4, Pa-5 and Pa-7 genes. The intermediate resistance of Monte Christo is probably based on gene(s) different from EP 75.