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Diversity of repetitive sequences within compact genomes of Phaseolus L. beans and allied genera Cajanus L. and Vigna Savi

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Abstract

Repetitive sequences are ubiquitous and fast-evolving elements responsible for size variation and large-scale organization of plant genomes. Within tribe Phaseoleae (Fabaceae), some genera, such as Phaseolus, Vigna, and Cajanus, show small genome and mostly stable chromosome number. Here, we applied a combined computational and cytological approach to study the organization and diversification of repetitive elements in some species of these genera. Sequences were classified in terms of type and repetitiveness and the most abundant were mapped to chromosomes. We identified long terminal repeat (LTR) retrotransposons, especially Ogre and Chromovirus elements, making up most of genomes, other than P. acutifolius and Vigna species. Satellite DNAs (SatDNAs) were less representative, but highly diverse among species, showing a clear phylogenetic relationship. In situ localization revealed preferential location at pericentromeres and centromeres for both types of sequences, suggesting a heterogeneous composition, especially for centromeres. Few elements showed subterminal accumulation. Copy number variation among chromosomes within and among species was observed for all nine identified SatDNAs. Altogether, our data pointed two main elements (Ty3/Gypsy retrotransponsons and SatDNAs) to the diversification on the repetitive landscape in Phaseoleae, with a typical set of repeats in each species. The high turnover of these sequences, however, did not affect total genome size.

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Abbreviations

BAC:

Bacterial artificial chromosome

BLAST:

Basic local alignment search tool

CCD:

Charge-coupled device

CTAB:

Cetrimonium bromide

DAPI:

4',6-diamidino-2-phenylindole

DNA:

Deoxyribonucleic acid

GE:

General Electric

IPTG:

Isopropyl β-D-1-thiogalactopyranoside

LB:

Lysogeny broth

LINE:

Long interspersed nuclear elements

LTR:

Long terminal repeat

NCBI:

National Center for Biotechnology Information

PCR:

Polymerase chain reaction

SSC:

Saline-sodium citrate

TBT:

Trehalose, bovine serum albumin (BSA), and polysorbate-20 (Tween-20)

X-gal:

5-Bromo-4-chloro-3-indolyl β-D-galactopyranoside

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Acknowledgments

We thank Embrapa Recursos Genéticos e Biotecnologia (Brasília, Brazil) and the Genebank of the IPK (Gatersleben, Germany) for providing the seeds, and the Platform of Sequencing-LABCEN/CCB at UFPE for the use of its facilities. We are also grateful to the two anonymous reviewers for the critical reading and helpful comments on the manuscript.

Funding

A. Pedrosa-Harand received financial support from Conselho Nacional de Desenvolvimento Científico e Tecnológico (CNPq), Brazil.

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ACBV, APH, and TR conceived and designed the research. EV, KGBS, MV, and TR conducted the experiments and analyzed the data. TR wrote the manuscript. All authors read and approved the manuscript.

Corresponding authors

Correspondence to Tiago Ribeiro or Andrea Pedrosa-Harand.

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The authors declare that they have no conflict of interest.

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Responsible Editor: Jiming Jiang

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Ribeiro, T., Vasconcelos, E., dos Santos, K.G.B. et al. Diversity of repetitive sequences within compact genomes of Phaseolus L. beans and allied genera Cajanus L. and Vigna Savi. Chromosome Res 28, 139–153 (2020). https://doi.org/10.1007/s10577-019-09618-w

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  • DOI: https://doi.org/10.1007/s10577-019-09618-w

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