龙S是一个广谱抗稻瘟病的水稻两用核不育系,利用分子标记技术精细定位其主效抗性基因,对于培育抗稻瘟病水稻新品种具有重要意义。采用来自国内外的41个稻瘟病菌系通过接种鉴定方式对龙S进行了稻瘟病抗谱分析,结果显示龙S的抗性频率为10...龙S是一个广谱抗稻瘟病的水稻两用核不育系,利用分子标记技术精细定位其主效抗性基因,对于培育抗稻瘟病水稻新品种具有重要意义。采用来自国内外的41个稻瘟病菌系通过接种鉴定方式对龙S进行了稻瘟病抗谱分析,结果显示龙S的抗性频率为100%,对其中39个菌系表现高水平抗性,与Pi9的携带品种75-1-127抗性频率和抗病级别基本相当。群体遗传分析表明龙S的抗性基因表现为显性遗传方式,对于不同菌系龙S表现出不同的抗病遗传模式,其中龙S对稻瘟菌系318-2的抗性由单基因控制。通过抗病亲本龙S与感病亲本日本晴构建F2分离群体,采用BSA(bulk segregant analysis)及RCA(recessive class analysis)分析方法,将龙S的主效抗病基因精细定位于第9染色体上的SSR标记M1-M2所在的1.31cM区间,与已克隆的广谱抗稻瘟病基因Pi5位于相邻的染色体区域。抗谱分析表明,龙S与Pi5、Pii单基因系的抗性频率差异明显,抗谱较后二者更广。龙S主效抗性基因的精细定位,为进一步揭示其与Pi5、Pii的等位关系以及通过分子标记辅助选择培育抗病水稻新品种奠定了基础。展开更多
In this paper,the shear wave splitting features of the Longtan reservoir area are studied by adopting the traditional cross-correlation coefficient method and polarization analysis,using the data recorded by the seism...In this paper,the shear wave splitting features of the Longtan reservoir area are studied by adopting the traditional cross-correlation coefficient method and polarization analysis,using the data recorded by the seismic network founded by a project under the National Science and Technology Pillar Program from April 2009 to April 2010.We found that most of polarization directions at seismic stations are consistent with the direction of the overall regional stress field,but local structures and faults may control or influence the fast shear-wave polarization direction.The time-delay normalized to source-station path is between 10 to 25ms/km,and among them,the time-delay is about 10ms/km at the LIL and XIL sites,which are farther away from the dam.The water depth is relatively shallow and seismic activity relatively weak after water storage,indicating the effect of reservoir water penetration,or loading,on the state of cracks in the reservoir area.We also found that the delay time changes consistently with the water level at stations DPD and GAL.It may be related to crack expansion and water penetration caused by the reservoir impoundment.展开更多
龙18S是垦丰长江种业科技有限公司以光温敏不育系Y58S与C815S杂交后,经4 a 8代系选育而成的籼型水稻光温敏两系不育系。该不育系株型松散、不育性稳定、配合力强、异交结实性好、米质较好,于2019年通过安徽省农作物品种审定委员会技术...龙18S是垦丰长江种业科技有限公司以光温敏不育系Y58S与C815S杂交后,经4 a 8代系选育而成的籼型水稻光温敏两系不育系。该不育系株型松散、不育性稳定、配合力强、异交结实性好、米质较好,于2019年通过安徽省农作物品种审定委员会技术鉴定。利用龙18S选配的龙两优月牙丝苗已于2020年通过国家农作物品种审定委员会审定。展开更多
文摘龙S是一个广谱抗稻瘟病的水稻两用核不育系,利用分子标记技术精细定位其主效抗性基因,对于培育抗稻瘟病水稻新品种具有重要意义。采用来自国内外的41个稻瘟病菌系通过接种鉴定方式对龙S进行了稻瘟病抗谱分析,结果显示龙S的抗性频率为100%,对其中39个菌系表现高水平抗性,与Pi9的携带品种75-1-127抗性频率和抗病级别基本相当。群体遗传分析表明龙S的抗性基因表现为显性遗传方式,对于不同菌系龙S表现出不同的抗病遗传模式,其中龙S对稻瘟菌系318-2的抗性由单基因控制。通过抗病亲本龙S与感病亲本日本晴构建F2分离群体,采用BSA(bulk segregant analysis)及RCA(recessive class analysis)分析方法,将龙S的主效抗病基因精细定位于第9染色体上的SSR标记M1-M2所在的1.31cM区间,与已克隆的广谱抗稻瘟病基因Pi5位于相邻的染色体区域。抗谱分析表明,龙S与Pi5、Pii单基因系的抗性频率差异明显,抗谱较后二者更广。龙S主效抗性基因的精细定位,为进一步揭示其与Pi5、Pii的等位关系以及通过分子标记辅助选择培育抗病水稻新品种奠定了基础。
基金sponsored by the National Key Technology R&D Program(2008BAC38B02),China
文摘In this paper,the shear wave splitting features of the Longtan reservoir area are studied by adopting the traditional cross-correlation coefficient method and polarization analysis,using the data recorded by the seismic network founded by a project under the National Science and Technology Pillar Program from April 2009 to April 2010.We found that most of polarization directions at seismic stations are consistent with the direction of the overall regional stress field,but local structures and faults may control or influence the fast shear-wave polarization direction.The time-delay normalized to source-station path is between 10 to 25ms/km,and among them,the time-delay is about 10ms/km at the LIL and XIL sites,which are farther away from the dam.The water depth is relatively shallow and seismic activity relatively weak after water storage,indicating the effect of reservoir water penetration,or loading,on the state of cracks in the reservoir area.We also found that the delay time changes consistently with the water level at stations DPD and GAL.It may be related to crack expansion and water penetration caused by the reservoir impoundment.
文摘龙18S是垦丰长江种业科技有限公司以光温敏不育系Y58S与C815S杂交后,经4 a 8代系选育而成的籼型水稻光温敏两系不育系。该不育系株型松散、不育性稳定、配合力强、异交结实性好、米质较好,于2019年通过安徽省农作物品种审定委员会技术鉴定。利用龙18S选配的龙两优月牙丝苗已于2020年通过国家农作物品种审定委员会审定。