نوع مقاله : مقاله پژوهشی
نویسندگان
1 سازمان تحقیقات، آموزش و ترویج کشاورزی، مؤسسه تحقیقات علوم باغبانی، پژوهشکده میوه‌های معتدله و سردسیری، ایران، کرح
2 سازمان تحقیقات، آموزش و ترویج کشاورزی، مؤسسه تحقیقات علوم باغبانی، پژوهشکده میوه‌های معتدله و سردسیری، کرج، ایران
چکیده
کلیدواژه‌ها
موضوعات
عنوان مقاله [English]
نویسندگان [English]
Antixenosis resistance in apple rootstocks against the woolly apple aphid (Eriosoma lanigerum Hausmann) plays a pivotal role in reducing economic losses caused by this pest. This study aimed to elucidate resistance mechanisms and their association with root traits, conducted over seven years (The first three years of research 2017-2019 were devoted to the production and preparation of plant materials, and the next four years 2020-2023 to the resistance assessment phase) on 10 hybrid genotypes derived from crosses between dwarf native and commercial rootstocks (M9, M27, B9) at the Kamalshahr Research Station in Karaj, Iran. Biweekly sampling of aphid colonies and evaluating indices such as host preference, prevalence, colony aggregation, and habitat niche were performed. Factor analysis identified two principal components: host attractiveness and successful establishment (87.1% variance) and habitat limitation (12.5% variance). Hierarchical clustering categorized rootstocks into four resistance groups (susceptible, semi-susceptible, semi-resistant, resistant), with M9op3 identified as the most resistant genotype, exhibiting the lowest host preference index (0.63) and the highest unexploited habitat niche (0.63). Positive correlations between root sucker density and host preference (0.51), alongside negative correlations between root elongation zone length and habitat potential (−0.59), confirmed the direct influence of root traits on antixenosis resistance. The results emphasize the integration of morphological root traits (reduced sucker density and increased root elongation zone length) with ecological mechanisms in developing resistant rootstocks. These findings provide breeding strategies for selecting resilient genotypes, reducing pesticide use, and promoting sustainable horticulture.
کلیدواژه‌ها [English]
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