Heterosis for Plant Height and Ear Position in Maize Revealed by Quantitative Trait Loci Analysis with Triple Testcross Design
Heterosis for Plant Height and Ear Position in Maize Revealed by Quantitative Trait Loci Analysis with Triple Testcross Design
复制标题
DOI：
10.3724/sp.j.1006.2011.01186
复制
发表时间：
2011
期刊：
影响因子：
--
通讯作者：
S. Fang
中科院分区：
文献类型：
--
作者：
S. Fang
The genetic basis of plant height and ear position for highly heterotic maize hybrid Yuyu 22 was analyzed by using TTC(triple testcross) genetic mating design,with a population including 270 testcross progenies.By using composite interval mapping,the numbers of detected QTLs for plant height and ear position were 20 and 17,respectively.These QTLs for plant height and ear position were classified as overdominant(11 and 8),additive(5 and 6),dominant(2 and 0) and partially dominant(2 and 3).Further analysis indicated that several QTL regions,including Bin1.06(umc2151-umc1122),Bin3.05(umc2127-umc2166-umc1539) and Bin7.03(umc1865-umc1888),contributed to both plant height and ear position,which was consistent with the significant correlation between plant height and ear position.One-dimensional genome scan showed four and seven genome regions of QTL × genetic background interactions,22 and 12 marker pairs with epistatic effects for plant height and ear height respectively and the contribution for phenotypic variation was 3.26-16.58% and 3.44-22.41%,which suggests that the contribution of epistasis to the heterosis of the two traits is important.
