Abstracts
Abstract
Thirty-four Turkish barley (Hordeum vulgare) varieties were tested for the presence of resistance genes (R-genes) to powdery mildew (Blumeria graminis f. sp. hordei) using the “leaf segment test” with nine isolates of the fungus. The most commonly found R-gene was Mla8, while a combination of R-genes Mlg and Ml(CP) was found in three varieties (Tokak 157/37, Beysehir 98, Konevei 98). The gene Mlh was found in four varieties (Obruk 86, Anadolu 86, Çıldır 02, Özdemir 05), while no R-gene was found in three varieties (Hamidiye 85, Yesevi 93, Bülbül 89). No clear inferences could be made for the partly-resistant varieties Gemici 7243, Yea 793.12 and Akhisar 98 using the test isolates selected, which suggests the presence of still unidentified R-genes. Overall, 10 previously characterized R-genes for powdery mildew (Mla8, Ml(La), Mlg, Ml(CP), Mlh, Mlat, Mla1, Mlh, Mla7, Mlra) were present in Turkish barley varieties, along with some other(s) still to be identified.
Key words:
- Barley,
- Blumeria graminis f. sp. hordea,
- Hordeum vulgare,
- leaf segment test,
- powdery mildew,
- resistance genes
Résumé
Trente-quatre variétés d’orge (Hordeum vulgare) cultivées en Turquie ont été testées pour la présence de gènes de résistance (R) a l’oïdium (blanc) (Blumeria graminis f. sp. hordei) a l’aide du « test des segments foliaires » et de neuf isolats du champignon. Le gène R le plus commun parmi les variétés testées était Mla8, alors qu’une combinaison des gènes Mlg et Ml(CP) était trouvée chez trois variétés (Tokak 157/37, Beysehir 98, Konevei 98). La présence du gène Mlh a été identifiée chez quatre variétés (Obruk 86, Anadolu 86, Çıldır 02, Özdemir 05), alors qu’aucun gène R n’a été détecté dans trois autres variétés (Hamidiye 85, Yesevi 93, Bülbül 89). Aucune inférence n’a pu être clairement établie pour les variétés Gemici 7243, Yea 793.12 et Akhisar 98 a l’aide des isolats fongiques utilisés, ce qui suggère la présence de gènes R encore non identifiés. Au total, 10 gènes de résistance à l’oïdium (Mla8, Ml(La), Mlg, Ml(CP), Mlh, Mlat, Mla1, Mlh, Mla7, Mlra) étaient présents dans les variétés d’orge cultivées en Turquie, en plus d’autre(s) gène(s) non identifié(s).
Mots clés:
- Blumeria graminis f. sp. hordea,
- gènes de résistance,
- Hordeum vulgare,
- oïdium,
- orge,
- test des segments foliaires
Appendices
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