关键词:水稻; 黑条矮缩病; 抗性鉴定 An Evaluation System for Rice Black-Streaked Dwarf Virus Disease and Screening for Resistant Rice Germplasm WANG Bao-Xiang1, HU Jin-Long2, SUN Zhi-Guang2, SONG Zhao-Qiang2, LU Bai-Guan1, ZHOU Zhen-Ling1, FAN Ji-Wei1, QIN De-Rong1, LIU Yu-Qiang2, JIANG Ling2, XU Da-Yong1,*, WAN Jian-Min2,3,* 1Institute of Lianyungang Agricultural Science of Xuhuai Area, Lianyungang 222006, China
2 State Key Laboratory of Crop Genetics and Germplasm Enhancement / Nanjing Agricultural University, Nanjing 210095, China
3 Institute of Crop Science, Chinese Academy of Agricultural Sciences, Beijing 100081, China
Fund: AbstractRice black-streaked dwarf virus disease (RBSDVD) is one of the most serious viral diseases. The absence of efficient resistance evaluation system for RBSDVD restricts the excavation of the resistance resource, thereby the resistance breeding and basal researches are limited. Here, we proposed that the appropriate density of small brown planthopper (SBPH) should be 8 × 104 ha-1 and the rate of RBSDV-carrying SBPH should be over 5% for RBSDVD evaluation in field condition. Further, we optimized the artificial inoculation evaluation system including circulative period, number of SBPH per plant, infestation time and age of SBPH. We evaluated 1240 varieties from 21 countries for RBSDV resistance by natural inoculation in 2010, 34 cultivars had the disease incidence less than 10%. The 34 cultivars were further evaluated by natural inoculation in three different locations in 2011 and 2012, respectively. Finally, only three varieties, Kanyakumari 29, Madurai 25, and Vietnam 160, which all came from Southeast Asia, had the consistent disease incidence less than 10% in different locations and years. To verify the resistance of the three varieties against RBSDVD, we carried out the interval sowing inoculation experiment in the three different locations in 2012. In the interval sowing experiment, the disease incidence of Kanyakumari 29 was less than 12%, whereas Madurai 25 and Vietnam 160 less than 9%. In addition, in the artificial field inoculation and artificial room inoculation experiments, the disease incidence of the three varieties was less than 9%. The above natural and artificial inoculation experiments showed that Kanyakumari 29, Madurai 25, and Vietnam 160 performed stable and high RBSDVD resistance. Taken together, the RBSDVD evaluation system combining field with artificial infestation identifications used in this study is accurate and reliable. This system could be used to widely screen RBSDVD resistance resources. The construction of RBSDVD evaluation system and the RBSDVD resistance resources identified in this study will provide the useful tools and materials for the identification of RBSDVD resistance gene(s) and development of RBSDVD resistance varieties.
Keyword:Rice (Oryza sativa L.); Rice black-streaked dwarf virus; Resistance identification Show Figures Show Figures
图1 黑条矮缩病人工接种鉴定流程图A: 室内养虫; B: 病苗; C: 虫箱内饲毒; D: 室内接种(7 d); E: 移植到田间。Fig. 1 The flow graph of artificial infestation for RBSDVD evaluationA: rearing SBPH in the room; 2: disease plant; C: virus acquisition in the SBPH rearing box; D: inoculation in the room (7 d); E: cultivated in the field RBSDVD: rice black-streaked dwarf virus disease; SBPH: small brown planthopper.
图2 不同接种条件对黑条矮缩病人工接种鉴定的效果比较A: 不同饲毒时间对发病率影响; B: 不同接虫密度对发病率影响; C: 水稻不同接种龄期黑条矮缩病发病率; D: 灰飞虱接种龄期对发病率影响。Fig. 2 Comparison of artificial infestation efficiency in different conditionsA: effects of virus acquisition time on incidence; B: effects of small brown planthopper number on incidence; C: effects of Leaf age on incidence; D: effects of instar on incidence.
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