Screening Cucumber Plant Introduction Accession Lines for Resistance against Cucumber Strain of Papaya ringspot virus (PRSV)

A. Owolabi, C. Nwachukwu, S. Odok
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Abstract

Cucumber is a popular fruit vegetable widely cultivated in Odukpani and Akamkpa local government areas of Cross River State, Nigeria, supplying the consumption needs of the nearby metropolitan Calabar City dwellers. However, its cultivation is threatened by infection by Papaya ringspot virus watermelon strain (PRSV-W). This study provides the result of screen house evaluation of USDA Plant Introduction (PI) accessions lines of cucumber for resistance to a Nigerian cucumber strain of PRSV-W. The response of the lines showed a spectrum of reactions to the virus strain from the extremely susceptible ones, that could not withstand the virus infection to the immune that were uninfected by the virus. Out of the 187 accession lines screened, 22 immune lines (PI 391570, PI 419010, PI 419017, PI 432873, PI 432877, PI 432878, PI 432895, PI 489752, PI 137845, PI 211979, PI 211984, PI 605924, PI 606010, PI 227207, PI 390253, PI 223437, PI 118279, PI 422200, PI 525152, PI 406473, PI 390952 and PI 357867) were identified. Besides, 17 others (PI 118807, PI 163217, PI 165509, PI 175121, PI 177364, PI 179263, PI 212985, PI 215589, PI 217644, PI 220791, PI 234517, PI 249562, PI 267746, PI 271326, PI 344384, PI 358813 and PI 358814) showed high tolerant and eight others were moderately tolerant to the virus. The remaining 140 PI lines were very susceptible to the virus. The identification of completely immune and highly tolerant PI accession cucumber lines in this study points the availability at the USDA germ plasm collections of potential materials that could be included in breeding programs to develop high resistant varieties of cucumber to PRSV-W.
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黄瓜植株抗番木瓜环斑病毒(PRSV)引进系的筛选
黄瓜是一种受欢迎的水果蔬菜,在尼日利亚克罗斯河州的Odukpani和Akamkpa地方政府地区广泛种植,供应附近大都市卡拉巴尔市居民的消费需求。但其栽培受到木瓜环斑病毒西瓜株(prv - w)感染的威胁。本研究提供了美国农业部(USDA)植物引种(PI)黄瓜材料对尼日利亚一株prv - w抗性的筛选评价结果。这些细胞系的反应显示了对病毒株的一系列反应,从极度易感的,无法抵抗病毒感染的,到免疫的,未被病毒感染的。在筛选的187个加入系中,鉴定出22个免疫系(PI 391570、PI 419010、PI 419017、PI 432873、PI 432877、PI 432878、PI 432895、PI 489752、PI 137845、PI 211979、PI 211984、PI 605924、PI 606010、PI 227207、PI 390253、PI 223437、PI 118279、PI 422200、PI 525152、PI 406473、PI 390952和PI 357867)。另外,有17例(PI 118807、PI 163217、PI 165509、PI 175121、PI 177364、PI 179263、PI 212985、PI 215589、PI 217644、PI 220791、PI 234517、PI 249562、PI 267746、PI 271326、PI 344384、PI 358813和PI 358814)对该病毒具有高耐受性,8例为中等耐受性。其余140个PI系对该病毒非常敏感。本研究中对稻瘟病具有完全免疫和高耐受性的稻瘟病黄瓜品系的鉴定,为美国农业部种质资源收集提供了潜在的材料,可用于培育稻瘟病抗性高的黄瓜品种。
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