Data from: Comparative Analysis Reveals Genomic Characteristics in <i>R-genes</i> 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 <i>Candidatus </i>Liberibacter asiaticus (<i>C</i>Las) 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 (<i>R-genes</i>), 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 <i>R-genes</i> in the genomes of five citrus species with different HLB-resistance levels. Among these species, three were wild Australian limes rated as HLB-resistant (<i>Citrus glauca</i>) and HLB-tolerant (<i>C. australasica </i>and<i> C. inodora</i>), and two were cultivated species (<i>C. clementina</i> and <i>C. sinensis</i>) both rated as susceptible.黄龙病（HLB）是一种毁灭性柑橘病害，对全球柑橘产业构成严重威胁。该病害与候选韧皮部杆菌亚洲种（Candidatus Liberibacter asiaticus, C Las）相关，目前尚缺乏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发现，澳大利亚野生柑橘天然具备抗/耐黄龙病的特性。研究推测该抗性由抗病基因（R-genes）所赋予，其编码产物可介导病原体特异性防御反应。为从基因组层面解析黄龙病抗性的潜在机制，本研究对5个具有不同抗黄龙病水平的柑橘物种的基因组中的抗病基因进行了注释与特征分析。其中3个为澳大利亚野生柑橘类群：分别为抗黄龙病的灰叶柑橘（Citrus glauca）、耐黄龙病的澳洲指橙（C. australasica）与无香柑橘（C. inodora）；另外2个为栽培品种：克莱门氏柑橘（C. clementina）和甜橙（C. sinensis），二者均被划为感病类型。