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Opportunities in small population breeding in black cottonwood : or The little population that could

Apuli, Rami-Petteri (2021). Opportunities in small population breeding in black cottonwood : or The little population that could. Diss. (sammanfattning/summary) Sveriges lantbruksuniv., Acta Universitatis Agriculturae Sueciae, 1652-6880
ISBN 978-91-7760-797-7
eISBN 978-91-7760-798-4
[Doctoral thesis]

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Small and structured populations are problematic for breeding due to low levels of genetic variability and increased levels of linkage disequilibrium (LD). The increased LD causes problems with utilization of common genomic tools and may lead into increased accruement of deleterious alleles through the intense selection and bottlenecks characteristic of breeding. In forest trees, maintaining a large breeding population to alleviate these issues is difficult due to large physical size of most trees. The aim of this thesis was to study and resolve some of the LD dependent issues of small populations and establish small populations as an option in breeding. We established the accuracy of LD-based estimation methods of recombination using data from European aspen, allowing confident use of these methods later in the project. The small black cottonwood breeding population contained enough genetic diversity to facilitate future adaptive selection to novel Swedish climate and light conditions, suggesting that small populations consisting of offspring with diverse parentage are feasible options for breeding in species with high outcrossing and recombination rates. We identified candidate genes that can be targeted for selection on phenology and growth using a genome wide association study (GWAS). We also show that GWAS is useful for identifying large effect alleles even in small populations and that efficient growth under novel conditions likely require different allele combinations than in native habitats. Finally, we quantified deleterious load and identified effects of the deleterious load on growth. Accounting for deleterious load allowed for more effective genomic selection and increased breeding cycle gain in breeding programs based on small populations.

Authors/Creators:Apuli, Rami-Petteri
Title:Opportunities in small population breeding in black cottonwood : or The little population that could
Series Name/Journal:Acta Universitatis Agriculturae Sueciae
Year of publishing :2021
Number of Pages:87
Publisher:Department of Plant Biology, Swedish University of Agricultural Sciences
ISBN for printed version:978-91-7760-797-7
ISBN for electronic version:978-91-7760-798-4
Publication Type:Doctoral thesis
Article category:Other scientific
Version:Published version
Full Text Status:Public
Subjects:(A) Swedish standard research categories 2011 > 4 Agricultural Sciences > 404 Agricultural Biotechnology > Genetics and Breeding
Keywords:Plant breeding, forest trees, small population, genetic linkage, linkage disequilibrium, GWAS, local adaptation, deleterious load, Populus
Permanent URL:
ID Code:25299
Faculty:NJ - Fakulteten för naturresurser och jordbruksvetenskap
Department:(NL, NJ) > Dept. of Plant Biology and Forest Genetics (until 131231)
Deposited By: SLUpub Connector
Deposited On:10 Sep 2021 11:25
Metadata Last Modified:14 Sep 2021 13:39

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