Recursive Paleohexaploidization Shaped the Durian Genome.
Plant Physiol
; 179(1): 209-219, 2019 01.
Article
en En
| MEDLINE
| ID: mdl-30385647
ABSTRACT
The durian (Durio zibethinus) genome has recently become available, and analysis of this genome reveals two paleopolyploidization events previously inferred as shared with cotton (Gossypium spp.). Here, we reanalyzed the durian genome in comparison with other well-characterized genomes. We found that durian and cotton were actually affected by different polyploidization events hexaploidization in durian â¼19-21 million years ago (mya) and decaploidization in cotton â¼13-14 mya. Previous interpretations of shared polyploidization events may have resulted from the elevated evolutionary rates in cotton genes due to the decaploidization and insufficient consideration of the complexity of plant genomes. The decaploidization elevated evolutionary rates of cotton genes by â¼64% compared to durian and explained a previous â¼4-fold over dating of the event. In contrast, the hexaploidization in durian did not prominently elevate gene evolutionary rates, likely due to its long generation time. Moreover, divergent evolutionary rates probably explain 98.4% of reconstructed phylogenetic trees of homologous genes being incongruent with expected topology. The findings provide further insight into the roles played by polypoidization in the evolution of genomes and genes, and they suggest revisiting existing reconstructed phylogenetic trees.
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Banco de datos:
MEDLINE
Asunto principal:
Poliploidía
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Genoma de Planta
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Bombacaceae
Idioma:
En
Año:
2019
Tipo del documento:
Article