摘要
遗传异常分离既是自然界非常普遍的现象,也是生物进化的动力之一。产生异常分离的原因可能与配子体或孢子体的选择有关。利用6个以类病变(lmi)和矮杆突变体(d6)为亲本的杂交组合(F2或F3),对该类病变和矮杆基因的遗传规律及异常分离现象作初步的分析。结果显示,lmi×02428和d6×93-11的F2群体以及F3株系中存在极端异常分离的现象;LMI基因附近的分子标记ST8-1和D6基因附近的ST7-1、ST7-2、RM5490的带型分离同样也极显著偏离期望比;偏分离因子与类病斑LMI和矮杆基因D6紧密连锁,分别位于第8染色体分子标记ST8和ST8-2之间以及第7染色体分子标记ST7-1和ST7-3之间。异常分离现象还与杂交的组合有直接的关系。
Segregation distortion is a quite common phenomenon in living species and thought to be a potent evolutional force. The main reasons of distorted segregation ratios are responsible for the selection of gametes or sporophytes. In this study, two extreme segregation distortions from the progenies of lmi × 02428 and d6 × 93-11 were identified. The segregation ratio of molecular markers tightly linked with LMI and D6 genes were analyzed and skew segregation were found in the markers tested which were indicated by significant deviation from the expected Mendelian segregation ratio（1：2：1）. The segregation distorted regions were detected between molecular markers ST8 and ST8-2 near the centromere of chromosome 8, and ST7-1 and ST7-3 near telomere of chromosome 7, respectively. Meanwhile, the results indicated that segregation distortion had related with the different crossed combinations.
出处
《遗传》
CAS
CSCD
北大核心
2006年第10期1259-1264,共6页
Hereditas（Beijing)
基金
国家高技术研究发展计划项目(863计划)(编号:2004BA525B02)
国家自然科学基金(编号:30300221)资助~~
关键词
水稻
异常分离
配子体基因
异常分离因子
rice
segregation distortion
gametophytic gene （ga）
distortion factors
