Analysis on Resistance of Rice Cultivar Lianjing 7 to Rice Black-streaked Dwarf Disease

水稻品种‘连粳7号’对黑条矮缩病的抗性分析（英文）

To analyze the resistance of Lianjing 7 against rice black-streaked dwarf disease and find the molecular markers closely linked with the resistance gene, an F2：3 population derived from an RBSDD-resistant cultivar Lianjing 7 and an RBSDD-susceptible cultivar Peiai 64, was evaluated using natural infection methods and artificial inoculation by scoring the disease severity rating. The results showed Lianjing 7 was resistant to RBSDD, with the incidence between 5.5% and 12.25% in all tests. For the parents of Lianjing 7, only Zhongjingchuan-2 was resistant to RBSDD. Besides this, Lianjing 7 assumed an antixenosis and antibiosis score similar with susceptible variety Wuyujing 3, which indicates that so RBSDD-resistance of Lianjing 7 is mainly caused by the resistance specifically to RBSDV. In the F2：3 population of Lianjing 7/Peiai 64, the disease severity rates showed a continuous distribution with transgressive segregation, it indicated the resistance of Lianjing 7 was controlled by multi-genes. The marker RM287 was determined closely linked with the resistance locus via BSA method. To conclude, Lianjing 7 has a high resistance to RBSDD, which is conferred with by Zhongjingchuan-2, and the marker RM287 should be useful for breeding novel RBSDD-resistant cultivars via marker-assisted selection （MAS）.

为分析水稻品种‘连粳7号’对水稻黑条矮缩病的抗性,获得与抗性基因紧密连锁的分子标记,通过田间自然接种和室内人工接种方法,对‘连粳7号’及其与感病品种‘培矮64’衍生来的F2:3群体进行黑条矮缩病抗性鉴定。结果表明,‘连粳7号’发病率最高为12.25%,最低为5.5%。‘连粳7号’的亲本中,仅‘中粳川-2’的抗性与‘连粳7号’相近。另外,‘连粳7号’对灰飞虱不具有抗性,所以‘连粳7号’对黑条矮缩病的抗性是品种本身对病毒的抗性所致。连粳7号/培矮64F2:3群体中,各个家系表型呈现连续分布,并具有超亲分离特点,说明抗性由多基因控制。最终,通过BSA法获得与抗性位点紧密连锁的标记RM287。综上,‘连粳7号’对黑条矮缩病具有较强抗性,抗性来自亲本‘中粳川-2’,标记RM287将为利用分子标记辅助培育抗黑条矮缩病水稻新品种提供有力工具。