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Study on Italian Onion Cultivars/Ecotypes towards Onion Yellow Dwarf Virus (OYDV) Infection

生态型 生物 栽培 马铃薯Y病毒 园艺 病理系统 植物病毒 种质资源 微卫星 病毒 植物 接种 基因 遗传学 等位基因
作者
Carla Libia Corrado,Giuseppe Micali,Antonio Mauceri,Sabrina Bertin,Francesco Sunseri,Maria Rosa Abenavoli,Antonio Tiberini
出处
期刊:Horticulturae [Multidisciplinary Digital Publishing Institute]
卷期号:10 (1): 73-73
标识
DOI:10.3390/horticulturae10010073
摘要

The onion yellow dwarf virus (OYDV) represents a limiting biotic stress in onion (Allium cepa L.); little information is available regarding resistant varieties. In Italy, onion production is limited but represented by a wide diversity of ecotypes. A two-year trial was carried out to test the OYDV-susceptibility/tolerance of different Italian onion cultivars by rating symptom severity and plant growth parameters and assessing post-harvest secondary infections. The cultivar and ecotypes included in the study were characterized by simple sequence repeats (SSR) analysis, and the expression analysis of two genes (Eukaryotic translation initiation factors, EIFs) involved in potyvirus replication was also performed. Two susceptible and one tolerant cultivar were identified based on symptom expression and virus impact on plants. Although differences in growth parameters were limited to the first-year trial, the infection was correlated to a higher incidence of secondary infections in post-harvest, with altered water balance in infected bulbs. This correlation was also demonstrated during the long-term storage of bulbs. SSR analysis identified different clusters and only one gene isoform (EIF4eiso1) showed different expression levels in the OYDV/onion pathosystem. In conclusion, this study defines the genetic profile of Italian onion cultivars and provides evidence on susceptibility/tolerance features which will be useful in the future for the identification of viral resistance traits in onion.
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