258份新疆野苹果种质资源火疫病 抗性评价与筛选

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Abstract：This study examined fire blight resistance in 258 Malus sieversiiaccessions collected from seven natural populations in Xinjiang，China.Resistance levels were evaluated through invitro inoculation of tender leaves，young shoots，and fruitlets with Erwiniaamylovora （fire blight pathogen），supplemented by field observations of natural infection rates.Results showed that most accessons exhibited moderate susceptibility in tender leaves and young shoots，while fruitlets were predominantly highly resistant.Field natural infection showed primarilyresistant responses.By integrating in vitro inoculation and field surveys，28 accessions with moderate resistance or higher were identified. Among these，three resources，GJS-4，GJS-12，and YA1-5， exhibited consistent resistance acros alltested tissues and field conditions.Significant inter-population variation in resistance was observed. The Gongliu population contained the highest proportion of resistant accessions， followed the Huocheng and Xinyuan.The Yining County and Chabuchaer populations showed intermediate resistance，while the Emin and Tuoli populations contained the fewest resistant accessions.This study provides a theoretical foundation for selecting fire blight-resistant apple germplasm and offers valuable breeding materials for developing resistant apple cultivars.

Key words： Malus sieversii; germplasm resources ; fire blight;resistance evaluation; screening

新疆野苹果[Malussieversii（Ledeb.）M.Roem.]，又称塞威氏苹果，属于蔷薇科（Rosaceae）苹果属（MalusMill.），是国家二级重点保护野生植物，被世界自然保护联盟（IUCN，InternationalUnionforConservationofNature）认定为是具有国际意义的生物多样性优先保护物种[1]。（剩余20280字）