2026-09-18T20:49:06Zhttps://ecommons.cornell.edu/server/oai/requestoai:ecommons.cornell.edu:1813/648992026-05-15T19:46:42Zcom_1813_35col_1813_47
Carlson, Craig Henry
Smart, Lawrence B.
Doyle, Jeffrey J.
De Jong, Walter S.
Gore, Michael Allen
2019-04-02T14:00:26Z
2019-04-02T14:00:26Z
2018-12-30
ProQuest Submission ID: 11139
ProQuest Publication ID: 10937079
https://hdl.handle.net/1813/64899
https://doi.org/10.7298/racp-eh19
10758039
Sustainable, renewable energy production from lignocellulosic bioenergy crops such as shrub willow (Salix spp.), can help offset fossil fuel usage without competing with food crops. Hybridization is a key component in shrub willow breeding because hybrids often exhibit heterosis for yield. The genomic basis of heterosis in willow has not been well characterized, especially in high-yielding triploid hybrids. The primary objectives of this study were 1) to evaluate diverse diploid, triploid, and tetraploid families for a suite of traits important for biomass production, 2) to identify genomic regions linked to these traits, 3) to investigate the patterns gene expression in diploid and triploid hybrids, and 4) to correlate heterosis with gene expression in triploid hybrids. This work supports evidence that triploid hybrids of shrub willow exhibit heterosis for biomass growth traits. A high proportion of expression-level dominance and additive inheritance was observed among triploids, as well as cis- and trans-regulatory divergence. Importantly, nonadditive gene expression correlates with heterosis for biomass yield and growth traits among triploid hybrids. The extensive phenotypes collected will provide a database for future trait mapping and serve as a foundation for genomic selection. These results offer a unique perspective on the genomic basis of heterosis in high-yielding triploid hybrids, and will contribute to the growing genomic toolkit for the improvement of shrub willow as a bioenergy crop.
en_US
allele specific expression
differential gene expression
regulatory divergence
sex determination
Genetic mapping
Genetics
polyploidy
Molecular biology
Plant sciences
The Genomic Basis of Heterosis in High-Yielding Triploid Hybrids of Willow (Salix spp.) Bioenergy Crops
dissertation or thesis
application/pdf
Plant Breeding
Cornell University
Doctor of Philosophy
Ph. D., Plant Breeding
https://hdl.handle.net/1813/59810
Publication
Cornell Theses and Dissertations
Carlson, Craig Henry
5893a6ea-7af3-41d7-abc6-04bcd26ab5df
open.access
open.access
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<Title>The Genomic Basis of Heterosis in High-Yielding Triploid Hybrids of Willow (Salix spp.) Bioenergy Crops</Title>
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<Keyword>allele specific expression</Keyword>
<Keyword>differential gene expression</Keyword>
<Keyword>regulatory divergence</Keyword>
<Keyword>sex determination</Keyword>
<Keyword>Genetic mapping</Keyword>
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<Abstract>Sustainable, renewable energy production from lignocellulosic bioenergy crops such as shrub willow (Salix spp.), can help offset fossil fuel usage without competing with food crops. Hybridization is a key component in shrub willow breeding because hybrids often exhibit heterosis for yield. The genomic basis of heterosis in willow has not been well characterized, especially in high-yielding triploid hybrids. The primary objectives of this study were 1) to evaluate diverse diploid, triploid, and tetraploid families for a suite of traits important for biomass production, 2) to identify genomic regions linked to these traits, 3) to investigate the patterns gene expression in diploid and triploid hybrids, and 4) to correlate heterosis with gene expression in triploid hybrids. This work supports evidence that triploid hybrids of shrub willow exhibit heterosis for biomass growth traits. A high proportion of expression-level dominance and additive inheritance was observed among triploids, as well as cis- and trans-regulatory divergence. Importantly, nonadditive gene expression correlates with heterosis for biomass yield and growth traits among triploid hybrids. The extensive phenotypes collected will provide a database for future trait mapping and serve as a foundation for genomic selection. These results offer a unique perspective on the genomic basis of heterosis in high-yielding triploid hybrids, and will contribute to the growing genomic toolkit for the improvement of shrub willow as a bioenergy crop.</Abstract>
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