期刊
MOLECULAR BIOLOGY AND EVOLUTION
卷 29, 期 11, 页码 3601-3611出版社
OXFORD UNIV PRESS
DOI: 10.1093/molbev/mss168
关键词
next-generation sequencing; polyploidy; genome size; genome downsizing; transposable elements; LTR retrotransposons; Ty3/Gypsy; Orobanche; Phelipanche; Orobanchaceae
资金
- German Science Foundation [RE 603/9-1]
- Austrian Science Foundation (FWF) [P19404-B03]
- [AVOZ50510513]
- Austrian Science Fund (FWF) [P19404] Funding Source: Austrian Science Fund (FWF)
We used next-generation sequencing to characterize the genomes of nine species of Orobanchaceae of known phylogenetic relationships, different life forms, and including a polyploid species. The study species are the autotrophic, nonparasitic Lindenbergia philippensis, the hemiparasitic Schwalbea americana, and seven nonphotosynthetic parasitic species of Orobanche (Orobanche crenata, Orobanche cumana, Orobanche gracilis (tetraploid), and Orobanche pancicii) and Phelipanche (Phelipanche lavandulacea, Phelipanche purpurea, and Phelipanche ramosa). Ty3/Gypsy elements comprise 1.93%-28.34% of the nine genomes and Ty1/Copia elements comprise 8.09%-22.83%. When compared with L. philippensis and S. americana, the nonphotosynthetic species contain higher proportions of repetitive DNA sequences, perhaps reflecting relaxed selection on genome size in parasitic organisms. Among the parasitic species, those in the genus Orobanche have smaller genomes but higher proportions of repetitive DNA than those in Phelipanche, mostly due to a diversification of repeats and an accumulation of Ty3/Gypsy elements. Genome downsizing in the tetraploid O. gracilis probably led to sequence loss across most repeat types.
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