Genetic diversity and structure of improved indica rice germplasm
The characterization of genetic diversity and structure for improved cultivated varieties/elite lines is tremendously important to assist breeders in parental selection for inbred and hybrid breeding and heterotic group construction. In this study, a total of 737 improvedindicavarieties/lines develo...
| Autores principales: | , , , , |
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| Formato: | Journal Article |
| Lenguaje: | Inglés |
| Publicado: |
Cambridge University Press
2014
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| Acceso en línea: | https://hdl.handle.net/10568/165554 |
| _version_ | 1855533155653517312 |
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| author | Wang, Kai Qiu, Fulin dela Paz, Madonna Angelita Zhuang, Jieyun Xie, Fangming |
| author_browse | Qiu, Fulin Wang, Kai Xie, Fangming Zhuang, Jieyun dela Paz, Madonna Angelita |
| author_facet | Wang, Kai Qiu, Fulin dela Paz, Madonna Angelita Zhuang, Jieyun Xie, Fangming |
| author_sort | Wang, Kai |
| collection | Repository of Agricultural Research Outputs (CGSpace) |
| description | The characterization of genetic diversity and structure for improved cultivated varieties/elite lines is tremendously important to assist breeders in parental selection for inbred and hybrid breeding and heterotic group construction. In this study, a total of 737 improvedindicavarieties/lines developed recently and/or widely used by presentindicabreeding programmes worldwide were genotyped with a 384-single-nucleotide polymorphism assay. Model-based population structure analysis revealed the presence of two major groups with six subgroups (SGs), wherein no clear correlation was found between the groups/SGs and breeding programmes or geographical origin of the accessions. Over half of the accessions (51.8%) appeared to have less than 0.6 memberships assigned to any one of the six model-based groups, highlighting the wide range of gene flow within improvedindicavarieties/lines and the genetic integration of valuable alleles shared by ancestries among improved high-yielding varieties/lines through germplasm exchanges. Distance-based clustering revealed that Latin-American cultivatedindicalines have tended to form their own ecological cline, which could serve as a potential heterotic ecotype for hybrid rice breeding, although they are still closely related to Asianindicalines. African cultivatedindicalines, on the other hand, have not yet formed their own ecological cline. It was also observed that the most well-known hybrid rice parents, Zhenshan97B and Minghui63, were unexpectedly clustered in the same SG with a relatively narrow genetic distance, which suggests that a significant genetic distance between parents is not a prerequisite for all elite hybrid rice lines with high heterosis. |
| format | Journal Article |
| id | CGSpace165554 |
| institution | CGIAR Consortium |
| language | Inglés |
| publishDate | 2014 |
| publishDateRange | 2014 |
| publishDateSort | 2014 |
| publisher | Cambridge University Press |
| publisherStr | Cambridge University Press |
| record_format | dspace |
| spelling | CGSpace1655542025-05-14T10:24:19Z Genetic diversity and structure of improved indica rice germplasm Wang, Kai Qiu, Fulin dela Paz, Madonna Angelita Zhuang, Jieyun Xie, Fangming The characterization of genetic diversity and structure for improved cultivated varieties/elite lines is tremendously important to assist breeders in parental selection for inbred and hybrid breeding and heterotic group construction. In this study, a total of 737 improvedindicavarieties/lines developed recently and/or widely used by presentindicabreeding programmes worldwide were genotyped with a 384-single-nucleotide polymorphism assay. Model-based population structure analysis revealed the presence of two major groups with six subgroups (SGs), wherein no clear correlation was found between the groups/SGs and breeding programmes or geographical origin of the accessions. Over half of the accessions (51.8%) appeared to have less than 0.6 memberships assigned to any one of the six model-based groups, highlighting the wide range of gene flow within improvedindicavarieties/lines and the genetic integration of valuable alleles shared by ancestries among improved high-yielding varieties/lines through germplasm exchanges. Distance-based clustering revealed that Latin-American cultivatedindicalines have tended to form their own ecological cline, which could serve as a potential heterotic ecotype for hybrid rice breeding, although they are still closely related to Asianindicalines. African cultivatedindicalines, on the other hand, have not yet formed their own ecological cline. It was also observed that the most well-known hybrid rice parents, Zhenshan97B and Minghui63, were unexpectedly clustered in the same SG with a relatively narrow genetic distance, which suggests that a significant genetic distance between parents is not a prerequisite for all elite hybrid rice lines with high heterosis. 2014-08 2024-12-19T12:55:11Z 2024-12-19T12:55:11Z Journal Article https://hdl.handle.net/10568/165554 en Cambridge University Press Wang, Kai; Qiu, Fulin; Dela Paz, Madonna Angelita; Zhuang, Jieyun and Xie, Fangming. 2014. Genetic diversity and structure of improved indica rice germplasm. Plant Genet. Res., Volume 12 no. 2 p. 248-254 |
| spellingShingle | Wang, Kai Qiu, Fulin dela Paz, Madonna Angelita Zhuang, Jieyun Xie, Fangming Genetic diversity and structure of improved indica rice germplasm |
| title | Genetic diversity and structure of improved indica rice germplasm |
| title_full | Genetic diversity and structure of improved indica rice germplasm |
| title_fullStr | Genetic diversity and structure of improved indica rice germplasm |
| title_full_unstemmed | Genetic diversity and structure of improved indica rice germplasm |
| title_short | Genetic diversity and structure of improved indica rice germplasm |
| title_sort | genetic diversity and structure of improved indica rice germplasm |
| url | https://hdl.handle.net/10568/165554 |
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