A new pear scab resistance gene Rvp1 from the European pear cultivar ‘Navara’ maps in a genomic region syntenic to an apple scab resistance gene cluster on linkage group 2

Lydie Bouvier (1, 2) , Marie Bourcy (1, 2) , Mathieu Boulay (1, 2) , Marie Tellier (1, 2) , Philippe Guérif (1, 2) , Caroline Denance (1, 2) , Charles Eric Durel (1, 2) , Yves Lespinasse (1, 2)

1 IRHS - Institut de Recherche en Horticulture et Semences
2 GenHort - Génétique et Horticulture

Scab, caused by the ascomycete fungus Venturia pirina, leads to severe damage on European pear varieties resulting in a loss of commercial value and requiring frequent use of fungicides. Identifying scab resistance genes, developing molecular markers linked to these genes and establishing marker-assisted selection would be an effective way to improve European pear breeding for scab resistance. Most of the European pear cultivars (Pyrus communis) are currently reported to be sensitive. The pear cultivar ‘Navara’ was shown to carry a major scab resistance gene whose phenotypic expression in seedling progenies was a typical stellate necrosis symptom. The resistance gene was called Rvp1, for resistance to V. pirina, and was mapped on linkage group 2 of the pear genome close to microsatellite marker CH02b10. This genomic region is known to carry a cluster of scab resistance genes in apple indicating a first functional synteny for scab resistance between apple and pear.

Mots clés: PEAR; PYRUS COMMUNIS; SCAB RESISTANCE; VENTURIA PIRINA; APPLE-PEAR SYNTENY

Domaines: Sylviculture, foresterie

Lydie Bouvier, Marie Bourcy, Mathieu Boulay, Marie Tellier, Philippe Guérif, et al.. A new pear scab resistance gene Rvp1 from the European pear cultivar ‘Navara’ maps in a genomic region syntenic to an apple scab resistance gene cluster on linkage group 2. Tree Genetics and Genomes, 2012, 8 (1), pp.53-60. ⟨10.1007/s11295-011-0419-x⟩. ⟨hal-01209884⟩