核农学报2017，Vol.31Issue(5)：837-843,7.DOI:10.11869/j.issn.100-8551.2017.05.0837
基于三重测交群体解析玉米株高与穗位高杂种优势QTL
QTL Analysis of Heterosis for Plant Height and Ear Position Using Triple Testcross Population in Maize
摘要
Abstract
In order to detect quantitative trait loci (QTL) of plant height (PH) and ear position (EP) in maize (Zea mays L.),triple testcross (TTC) populations were constructed using 121 intermated B73 × Mo17 (IBM) individuals based on to the TTC genetic mating design.The inclusive composite interval mapping was applied for identification of QTLs.One additive QTL was separately found for heteorosis of PH and EP in two regions linked tightly on chromosome 9 with the phenotypic variation being indicated by single QTL being 14.3％ and 18.6 respectively,which was considered the same QTL contributing the heterosis of PH and EP simultaneously.In addition,two overdominant QTLs for heterosis of PH were identified on chromosomes 1 and 3,which could explain individually 9.0％-11.4％ of total variation and five overdominant QTLs for heterosis of EP were identified on chromosomes 1,6 and 8,with 6.6％-16.8％ of total variation contributed by single QTL.Further analysis revealed two additive × additive epistatic interactions and two dominant × dominant epistatic interactions for heterosis of EP,which taken together could account for 40.7 ％ and 26.8 ％ of total phenotypic variation due to additive × additive epistatic effect and dominant × dominant epistatic effect.These findings suggest additive,dominance and epistasis interactions may play an essential role in determining the heterosis of maize PH and EP.The major QTL mapped in the present study facilitate the selection of PH and EP in maize breeding based on heterosis.关键词
株高/穗位高/杂种优势/三重测交/QTLKey words
plant height/ear position/heterosis/triple testcross/QTL引用本文复制引用
张体付,梁帅强,吕远大,蒋璐,赵涵..基于三重测交群体解析玉米株高与穗位高杂种优势QTL[J].核农学报,2017,31(5):837-843,7.基金项目
国家自然科学基金(31401394),江苏省农业科技自主创新资金项目(CX(14)2009) （31401394）
