Determining the Fate of Hybridized Genomes in the Allopolyploid Brassica napus
Polyploidy is widely acknowledged as a widespread mechanism in the evolution and speciation of the majority of flowering plants. Allopolyploid forms through interspecific hybridization and whole genome duplication. While allopolyploids may display increased vigor relative to their progenitors, they...
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ndltd-CALPOLY-oai-digitalcommons.calpoly.edu-theses-13752021-08-31T05:01:35Z Determining the Fate of Hybridized Genomes in the Allopolyploid Brassica napus Wang, Tina Y Polyploidy is widely acknowledged as a widespread mechanism in the evolution and speciation of the majority of flowering plants. Allopolyploid forms through interspecific hybridization and whole genome duplication. While allopolyploids may display increased vigor relative to their progenitors, they can also face challenges to fertility following hybridization. Genetic changes in allopolyploids result from recombination between the hybridized subgenomes, which can influence phenotype and ultimately determine fitness of future generations. To study dynamic changes that follow allopolyploid formation, Brassica napus lineages were derived by hybridizing Brassica oleracea and Brassica rapa. Two lineages of B. napus were analyzed for genetic and phenotypic changes in the S2, S7, and S12 generations. Although these lineages were genetically identical at the time of hybridization, divergence was apparent by the S2 generation. There was a significant increase in sequence loss across generations within both lineages. Four of six generations from both lineages displayed no significant differences to each other in sequence loss relative to the parental generation. In both lineages, there was a bias towards losing sequences from the B. olereacea subgenome. Some individual plants showed novel phenotypes; however, there was no correlation between the examined genetic changes and selected phenotypes. 2010-07-01T07:00:00Z text application/pdf https://digitalcommons.calpoly.edu/theses/358 https://digitalcommons.calpoly.edu/cgi/viewcontent.cgi?article=1375&context=theses Master's Theses DigitalCommons@CalPoly allopolyploids genetic changes hybridization phenotypes Genetics and Genomics Molecular Genetics Plant Breeding and Genetics |
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allopolyploids genetic changes hybridization phenotypes Genetics and Genomics Molecular Genetics Plant Breeding and Genetics |
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allopolyploids genetic changes hybridization phenotypes Genetics and Genomics Molecular Genetics Plant Breeding and Genetics Wang, Tina Y Determining the Fate of Hybridized Genomes in the Allopolyploid Brassica napus |
description |
Polyploidy is widely acknowledged as a widespread mechanism in the evolution and speciation of the majority of flowering plants. Allopolyploid forms through interspecific hybridization and whole genome duplication. While allopolyploids may display increased vigor relative to their progenitors, they can also face challenges to fertility following hybridization. Genetic changes in allopolyploids result from recombination between the hybridized subgenomes, which can influence phenotype and ultimately determine fitness of future generations. To study dynamic changes that follow allopolyploid formation, Brassica napus lineages were derived by hybridizing Brassica oleracea and Brassica rapa. Two lineages of B. napus were analyzed for genetic and phenotypic changes in the S2, S7, and S12 generations. Although these lineages were genetically identical at the time of hybridization, divergence was apparent by the S2 generation. There was a significant increase in sequence loss across generations within both lineages. Four of six generations from both lineages displayed no significant differences to each other in sequence loss relative to the parental generation. In both lineages, there was a bias towards losing sequences from the B. olereacea subgenome. Some individual plants showed novel phenotypes; however, there was no correlation between the examined genetic changes and selected phenotypes. |
author |
Wang, Tina Y |
author_facet |
Wang, Tina Y |
author_sort |
Wang, Tina Y |
title |
Determining the Fate of Hybridized Genomes in the Allopolyploid Brassica napus |
title_short |
Determining the Fate of Hybridized Genomes in the Allopolyploid Brassica napus |
title_full |
Determining the Fate of Hybridized Genomes in the Allopolyploid Brassica napus |
title_fullStr |
Determining the Fate of Hybridized Genomes in the Allopolyploid Brassica napus |
title_full_unstemmed |
Determining the Fate of Hybridized Genomes in the Allopolyploid Brassica napus |
title_sort |
determining the fate of hybridized genomes in the allopolyploid brassica napus |
publisher |
DigitalCommons@CalPoly |
publishDate |
2010 |
url |
https://digitalcommons.calpoly.edu/theses/358 https://digitalcommons.calpoly.edu/cgi/viewcontent.cgi?article=1375&context=theses |
work_keys_str_mv |
AT wangtinay determiningthefateofhybridizedgenomesintheallopolyploidbrassicanapus |
_version_ |
1719472539700297728 |