New reference genome sequences of hot pepper reveal the massive evolution of plant disease-resistance genes by retroduplication.
Genome Biol
; 18(1): 210, 2017 11 01.
Article
em En
| MEDLINE
| ID: mdl-29089032
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.Palavras-chave
Texto completo:
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Base de dados:
MEDLINE
Assunto principal:
Doenças das Plantas
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Capsicum
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Genes de Plantas
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Retroelementos
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Evolução Molecular
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Duplicação Gênica
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Resistência à Doença
Idioma:
En
Ano de publicação:
2017
Tipo de documento:
Article