Mapping quantitative trait loci conferring heading date and plant height of rice under multiple environments
Date Issued
2010
Date
2010
Author(s)
Su, Chia-Hsuan
Abstract
Heading date and plant height are important agronomic traits in rice. Both traits are quantitative traits which are controlled by multiple genes. In this study, a rice F2:4 population consisting of 263 lines was derived from a cross between japonica variety Taiken 2 and indica variety Taichung Sen 10. The F2:4 population were grown in 3 location in 2 seasons to map QTL (quantitative trait loci).
The stcitistical method to detect QTL is multiple interval mapping. The result showed, in heading date, totally 11 QTLs which distributed on chromosome 1, 2, 3, 4, 5 ,7 ,8 and 10. The phenotypic variation explained (PVE) of these QTL are 1.5 ~ 62.0 %. In plant height, 4 QTLs were detected and distributed on chromosome 1, 2, 6 and 10.The PVE of these QTL are 1.7% ~ 49.9 %. The genetic effects of QTLs in parents were dispersed, leading to transgressive inheritance. These results indicated that the genetic effect of major QTL,qHD10 and qPH1, were stable in different environments However some QTL were influenced by QTL × environment effect (QE effect). The genetic effect of qHD3 in the first season was stronger than the second season, and the genetic effect of qHD8a in Taipei in the first season was stronger than other environments. All the other QTLs were minor QTLs and their genetic effect were unstable in different environments.
Mapping QTL under multiple environments could realize QE effect,and divided genetic effect into pure QTL effect and QE effect. In breeding program, the stable QTL could use in all environment, and the QTL which had QE effect could use for local variety. This study provided the information for marker assisted selection and marker assisted introgression.
Subjects
Oryza sativa
Quantitative trait loci
Heading date
Plant height
QTL-by-Environment Interaction
Type
thesis
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