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The evidence for non‐additive effect as the main genetic component of plant height and ear height in maize using introgression line populations
Author(s) -
Bai W.,
Zhang H.,
Zhang Z.,
Teng F.,
Wang L.,
Tao Y.,
Zheng Y.
Publication year - 2010
Publication title -
plant breeding
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.583
H-Index - 71
eISSN - 1439-0523
pISSN - 0179-9541
DOI - 10.1111/j.1439-0523.2009.01709.x
Subject(s) - introgression , quantitative trait locus , biology , backcrossing , population , genetics , gene , demography , sociology
With 2 figures and 5 tablesAbstract Two populations, one comprising 98 near‐isogenic introgression lines (Z3HBILs) with a Zong3 genetic background, and the other comprising a backcross population developed by crossing introgression lines per se with Zong3, were employed to identify quantitative trait loci (QTL) for plant height and ear height (EH) in maize grown at 2 years representing different environments. Nine QTL for plant height (PH) were detected, on chromosomes 1, 2, 3, 5 and 6, using inclusive composite interval (ICI) mapping. The extent of their contribution to phenotypic variation ranged from 3.1% to 22.6%. Fifteen QTL for EH were detected, on chromosomes 1, 2, 3, 4, 5, 6 and 8, and their contribution to phenotypic variation ranged from 5.6% to 31.2%. These QTL mainly showed non‐additive effects. In addition, 158 interacting pairs were detected among the QTL for the two traits. Interactions among the identified QTL accounted for only a small proportion of QTL pairs (19.6%), the percentage of phenotypic variation explained by an individual QTL pair ranged from 4.2% to 32.0% for PH and from 3.6% to 31.0% for EH respectively. Contrarily, non‐additive pairs accounted for a higher proportion. In addition, 30 additive × additive pairs accounted for only 19.0% of the interaction pairs. Overall, the non‐additive effect was the predominant genetic component of PH and EH in maize.