【摘要】 本研究于1979年开始,以“中国春”单体通过回交法,连续回交6次基本育成。其性状基本纯合,单体分离出的二体跟对照中的“阿勃”整倍体基本没有差别。每一单体核型均为2n-1=20″+1′=41,且1B 和6B 单体染色体均具有随体,与“中国春”1B 和6B 单体染色体形态一致。为了确保单体系统的可靠性,在第4次回交后按预定的常规程序,用“中国春”端着丝点二体系进行验证杂交。其结果除4B 单体外,其余20个单体核型均为2n-1=20″+t′,没有发生变迁。唯有4B 单体核型不很一致,怀疑为变迁单体。为了慎重,已开始采用加代的方法追溯前面各代,同时重新转育4B 单体。更多还原

【Abstract】 The study began in 1979.A new set of monosomic lines has beendeveloped through six backcrosses between the “Chinese Spring” monosomic series and “Abbondanza”.The characters of the monosomic linesare basically homozygous,and there are no obvious differences betweenthe disomics segregated from the monosomic and“Abbondanza”euploidused in Control.Each monosomic karyotype is 2n-1=20″+ 1′=41,nd 1B and 6B mnonosomic chromosomes are the Same as“ChineseSpring”with a satellite.In order to confirm the reliability of themonosomic lines,the ywere respectively test-crossed with the ditelosomiclines of“Chinese spring”in conventional Procedures after the 4 th backcrosses.The examination of PMC MetaphaseⅠof F₁ generation hasproved that the 20 monosomic had karyotype of 2n-1=20″+t′.Theonly exception was 4B monosomic karyotype,it was doubted to be anunivalent-shift.Remedy measures should be taken to select 4B monosomic.更多还原