期刊
GENOME BIOLOGY AND EVOLUTION
卷 14, 期 3, 页码 -出版社
OXFORD UNIV PRESS
DOI: 10.1093/gbe/evac017
关键词
evolution of development; genome assembly; Gilia; inflorescence architecture; QTL mapping; whole-genome duplication
资金
- BYU MEG award
- ORCA grant
- BYU Department of Biology
This study used the chromosome-scale reference genome of Gilia yorkii to investigate genome evolution in the Polemoniaceae and identified important genes related to inflorescence architecture and flower color variation through quantitative trait loci mapping. The results demonstrate that Gilia can serve as a genetic model for studying the evolution of development in plants.
Substantial morphological variation in land plants remains inaccessible to genetic analysis because current models lack variation in important ecological and agronomic traits. The genus Gilia was historically a model for biosystematics studies and includes variation in morphological traits that are poorly understood at the genetic level. We assembled a chromosome-scale reference genome of G. yorkii and used it to investigate genome evolution in the Polemoniaceae. We performed QTL (quantitative trait loci) mapping in a G. yorkiixG. capitata interspecific population for traits related to inflorescence architecture and flower color. The genome assembly spans 2.75 Gb of the estimated 2.80-Gb genome, with 96.7% of the sequence contained in the nine largest chromosome-scale scaffolds matching the haploid chromosome number. Gilia yorkii experienced at least one round of whole-genome duplication shared with other Polemoniaceae after the eudicot paleohexaploidization event. We identified QTL linked to variation in inflorescence architecture and petal color, including a candidate for the major flower color QTL-a tandem duplication of flavanol 3 ',5 '-hydroxylase. Our results demonstrate the utility of Gilia as a forward genetic model for dissecting the evolution of development in plants including the causal loci underlying inflorescence architecture transitions.
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