Abstract Detail

Phylogenomics

Liston, A. [1], Wei, Na [2], Tennessen, Jacob [3], Li, Junmin [4], Dong, Ming [5], Ashman, Tia-Lynn [6].

Revisiting the origin of the octoploid strawberry.

The cultivated strawberry, Fragaria ×ananassa, originated in France approximately 270 years ago via hybridization between two wild species introduced from North and South America. Both the cultivated strawberry and its parental species are octoploids with 2n=8x=56 chromosomes. In the recent publication of the genome of the cultivated strawberry, the authors present a novel phylogenetic hypothesis, proposing that each of the four subgenomes originated from a different 2n=2x=14 diploid progenitor. They further suggest that the hexaploid species Fragaria moschata was a direct ancestor of the strawberries. We reanalyzed the four octoploid subgenomes in a phylogenomic context, and found that only two extant diploids were progenitors, a result that is consistent with several previous studies. We also conducted a phylogenetic analysis of genetic linkage-mapped loci in the hexaploid F. moschata, and resolved its origin as independent of the octoploids. We identified assumptions in their tree-searching algorithm that prevented it from accepting extinct or unsampled progenitors, and we argue that this is a critical weakness of their approach. Correctly identifying their diploid progenitors is important for understanding and predicting the responses of polyploid plants to climate change and associated environmental stress.

1 - Oregon State University, Department Of Botany & Plant Pathology, 2082 Cordley Hall, Corvallis, OR, 97331, United States
2 - University of Pittsburgh, Department of Biological Sciences, Pittsburgh, PA, 15260, USA
3 - Harvard T. H. Chan School of Public Health, Department of Immunology and Infectious Diseases, Boston, MA, USA
4 - Taizhou University, Insitute Of Ecology, 1139 Shifu Road, Jiaojiang, Taizhou, Zhejiang, 318000, China
5 - College Of Life And Environmental Sciences, No.16 Xuelin St., Xiasha Higher Education Zone, Hangzhou, 310036, China
6 - Department Of Biological Sciences, 4249 Fifth Avenue & Ruskin, Pittsburgh, PA, 15260, United States

Keywords:
Fragaria
polyploidy
Whole Genome Sequencing.

Presentation Type: Oral Paper
Session: PHYL1, Phylogenomics I
Location: San Ignacio/Starr Pass
Date: Monday, July 29th, 2019
Time: 11:15 AM
Number: PHYL1013
Abstract ID:720
Candidate for Awards:None