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Theoretical and Applied Genetics

, Volume 93, Issue 1–2, pp 48–56 | Cite as

RFLP mapping of three new loci for resistance genes to powdery mildew (Erysiphe graminis f. sp. hordei) in barley

  • M. Schönfeld
  • A. Ragni
  • G. Fischbeck
  • A. Jahoor
Article

Abstract

Three new major, race-specific, resistance genes to powdery mildew (Erysiphe graminis f. sp. hordei) were identified in three barley lines, ‘RS42-6*O’, ‘RS137-28*E’, and ‘HSY-78*A’, derived from crosses with wild barley (Hordeum vulgare ssp. spontaneum). The resistance gene origining from wild barley in line ‘RS42-6*O’, showed a recessive mode of inheritance, whereas the other wild barley genes were (semi)-dominant. RFLP mapping of these three genes was performed in segregating F2 populations. The recessive gene in line ‘RS42-6*O’, was localized on barley chromosome 1S (7HS), while the (semi)-dominant genes in lines ‘RS137-28*E’, and ‘HSY-78*A’, were localized on chromosomes 1L (7HL) and 7L (5HL), respectively. Closely linked RFLP clones mapped at distances between 2.6cM and 5.3 cM. Hitherto, specific loci for powdery mildew resistance in barley had not been located on these chromosomes. Furthermore, tests for linkage to the unlocalized resistance gene Mlp revealed free segregation. Therefore, these genes represent new loci and new designations are suggested: mlt (‘RS42-6*O’), Mlf (‘RS137-28*E’), and Mlj (‘HSY-78*A’). Comparisons with mapped QTLs for mildew resistance were made and are discussed in the context of homoeology among the genomes of barley (H-vulgare), wheat (Triticum aestivum), and rye (Secale cereale). Duplications of RFLP bands detected in the neighbourhood of Mlf and mlt might indicate an evolutionary interrelationship to the Mla locus for mildew resistance.

Key words

Hordeum vulgare ssp. spontaneum Erysiphe graminis f. sp. hordei Mildewresistance RFLP mapping Homoeology 

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Copyright information

© Springer-Verlag 1996

Authors and Affiliations

  • M. Schönfeld
    • 1
  • A. Ragni
    • 2
  • G. Fischbeck
    • 1
  • A. Jahoor
    • 1
  1. 1.Lehrstuhl für Pflanzenbau und-Züchtung der TU MünchenWeihen-stephanGermany
  2. 2.Bio Integrated Technology S.r.1PantallaItaly

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