Data from: Comparative Analysis Reveals Genomic Characteristics in R-genes for HLB Resistance in Wild Australian Limes

Huanglongbing (HLB) is a devastating citrus disease that threatens the citrus industry globally. HLB is associated with the bacteria Candidatus Liberibacter asiaticus (CLas) and lacks tools for economically viable disease management. Previous field evaluation of citrus germplasm identified Australian wild limes as naturally tolerant/resistant to HLB. The resistance was hypothesized to be conferred by resistance genes (R-genes), the products of which mediate pathogen-specific defense responses. To gain insight into the mechanisms underlying HLB-resistance on the genomic level, we annotated and characterized the R-genes in the genomes of five citrus species with different HLB-resistance levels. Among these species, three were wild Australian limes rated as HLB-resistant (Citrus glauca) and HLB-tolerant (C. australasica and C. inodora), and two were cultivated species (C. clementina and C. sinensis) both rated as susceptible.黄龙病（Huanglongbing, HLB）是一种极具破坏性的柑橘病害，对全球柑橘产业构成严重威胁。该病害与亚洲韧皮部杆菌（Candidatus Liberibacter asiaticus, CLas）相关，目前尚无经济可行的病害防控手段。此前针对柑橘种质资源开展的田间评价研究显示，澳大利亚野生莱姆对HLB具有天然的耐性与抗性。研究推测，该抗性由抗病基因（R-genes）介导，其编码产物可介导病原菌特异性防御反应。为从基因组层面深入解析HLB抗性的分子机制，本研究对5个具有不同HLB抗性水平的柑橘物种的R-genes进行了注释与特征分析。其中3个为澳大利亚野生莱姆树种：分别为抗HLB的灰柑橘（Citrus glauca）、耐HLB的澳洲莱姆（C. australasica）与无臭莱姆（C. inodora）；另外2个为栽培品种：克莱门氏小柑橘（C. clementina）和甜橙（C. sinensis），二者均对HLB感病。