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College of Agriculture and Life Sciences (농업생명과학대학)
Dept. of Plant Science (식물생산과학부)
Journal Papers (저널논문_식물생산과학부)
New reference genome sequences of hot pepper reveal the massive evolution of plant disease-resistance genes by retroduplication
- Issue Date
- 2017-11-01
- Publisher
- BioMed Central
- Citation
- Genome Biology, 18(1):210
- Keywords
- NLR ; Retroduplication ; LTR-retrotransposon ; Disease-resistance gene ; Genome evolution
- Abstract
- Abstract
Background
Transposable elements are major evolutionary forces which can cause new genome structure and species diversification. The role of transposable elements in the expansion of nucleotide-binding and leucine-rich-repeat proteins (NLRs), the major disease-resistance gene families, has been unexplored in plants.
Results
We report two high-quality de novo genomes (Capsicum baccatum and C. chinense) and an improved reference genome (C. annuum) for peppers. Dynamic genome rearrangements involving translocations among chromosomes 3, 5, and 9 were detected in comparison between C. baccatum and the two other peppers. The amplification of athila LTR-retrotransposons, members of the gypsy superfamily, led to genome expansion in C. baccatum. In-depth genome-wide comparison of genes and repeats unveiled that the copy numbers of NLRs were greatly increased by LTR-retrotransposon-mediated retroduplication. Moreover, retroduplicated NLRs are abundant across the angiosperms and, in most cases, are lineage-specific.
Conclusions
Our study reveals that retroduplication has played key roles for the massive emergence of NLR genes including functional disease-resistance genes in pepper plants.
- ISSN
- 1474-760X
- Language
- English
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