Rice water weevil(Lissorhoptrus oryzophilus) is an important pest of paddy rice crops in Liaoning Province that was first described as a new alien invasive species in 1992.High quality DNA was successfully isolated an...Rice water weevil(Lissorhoptrus oryzophilus) is an important pest of paddy rice crops in Liaoning Province that was first described as a new alien invasive species in 1992.High quality DNA was successfully isolated and RAPD was effectively used to study genetic similarity and genetic variability of this insect among 120 individuals using eight primers.The high resolution provided by random amplified polymorphic DNA(RAPDs),in combination with efficient genetic distance estimators,allowed a preliminary description of the ecology and evolution of the populations of this insect in Liaoning Province.The results are compatible with a unique event of colonization and parthenogenesis,followed by the spreading of the water weevil across the surrounding Liaoning areas.A comparison of the results obtained with different genetic distance estimators is presented that show Suizhong group(pop3) is significant difference from the others which are generally similar.It means that: 1) Populations of rice water weevil from different area have different origin;2) Its rapid spread causes mainly by east populations in Liaoning;3) Host dis-continuum limits west population spread and design host interval can control the pest extending.However,it is still thought that the spreading tracks of this insect are not defined and need to be further studied.展开更多
番茄褐色皱果病毒Tomato brown rugose fruit virus(ToBRFV)主要为害番茄、辣椒等农作物,自2014年被首次发现后,扩展迅速,广泛传播,已扩散至全世界53个国家,经济和生态损失不断加大,辽宁省被该病毒入侵的可能性不断提高,有必要对该病毒...番茄褐色皱果病毒Tomato brown rugose fruit virus(ToBRFV)主要为害番茄、辣椒等农作物,自2014年被首次发现后,扩展迅速,广泛传播,已扩散至全世界53个国家,经济和生态损失不断加大,辽宁省被该病毒入侵的可能性不断提高,有必要对该病毒传入辽宁省的风险进行分析。文中按照有害生物风险分析程序开展安全性评估,采取多指标的评价方法,对番茄褐色皱果病毒的入侵风险进行定性和定量分析,确定番茄褐色皱果病毒入侵辽宁省的风险等级。番茄褐色皱果病毒是对辽宁省的番茄、辣椒种植和制种产业具有潜在威胁的有害生物,其综合风险值(R)为2.71,属于极高风险的有害生物,建议相关部门采取针对性防控措施,严防其传入辽宁省。展开更多
文摘Rice water weevil(Lissorhoptrus oryzophilus) is an important pest of paddy rice crops in Liaoning Province that was first described as a new alien invasive species in 1992.High quality DNA was successfully isolated and RAPD was effectively used to study genetic similarity and genetic variability of this insect among 120 individuals using eight primers.The high resolution provided by random amplified polymorphic DNA(RAPDs),in combination with efficient genetic distance estimators,allowed a preliminary description of the ecology and evolution of the populations of this insect in Liaoning Province.The results are compatible with a unique event of colonization and parthenogenesis,followed by the spreading of the water weevil across the surrounding Liaoning areas.A comparison of the results obtained with different genetic distance estimators is presented that show Suizhong group(pop3) is significant difference from the others which are generally similar.It means that: 1) Populations of rice water weevil from different area have different origin;2) Its rapid spread causes mainly by east populations in Liaoning;3) Host dis-continuum limits west population spread and design host interval can control the pest extending.However,it is still thought that the spreading tracks of this insect are not defined and need to be further studied.
文摘番茄褐色皱果病毒Tomato brown rugose fruit virus(ToBRFV)主要为害番茄、辣椒等农作物,自2014年被首次发现后,扩展迅速,广泛传播,已扩散至全世界53个国家,经济和生态损失不断加大,辽宁省被该病毒入侵的可能性不断提高,有必要对该病毒传入辽宁省的风险进行分析。文中按照有害生物风险分析程序开展安全性评估,采取多指标的评价方法,对番茄褐色皱果病毒的入侵风险进行定性和定量分析,确定番茄褐色皱果病毒入侵辽宁省的风险等级。番茄褐色皱果病毒是对辽宁省的番茄、辣椒种植和制种产业具有潜在威胁的有害生物,其综合风险值(R)为2.71,属于极高风险的有害生物,建议相关部门采取针对性防控措施,严防其传入辽宁省。
