| Texto completo | |
| Autor(es): |
Sader, Mariela
[1]
;
Vaio, Magdalena
[2]
;
Cauz-Santos, Luiz Augusto
[3, 4]
;
Dornelas, Marcelo Carnier
[5]
;
Vieira, Maria Lucia Carneiro
[3]
;
Melo, Natoniel
[6]
;
Pedrosa-Harand, Andrea
[1]
Número total de Autores: 7
|
| Afiliação do(s) autor(es): | [1] Univ Fed Pernambuco, Dept Bot, Lab Plant Cytogenet & Evolut, Recife, PE - Brazil
[2] Univ Republica, Fac Agron, Dept Plant Biol, Lab Plant Genome Evolut & Domesticat, Montevideo - Uruguay
[3] Univ Sao Paulo, Luiz de Queiroz Coll Agr, Genet Dept, Piracicaba, SP - Brazil
[4] Univ Vienna, Dept Bot & Biodivers Res, Vienna - Austria
[5] Univ Estadual Campinas, Inst Biol, Campinas, SP - Brazil
[6] Embrapa Semiarid, Lab Biotechnol, Petrolina, PE - Brazil
Número total de Afiliações: 6
|
| Tipo de documento: | Artigo Científico |
| Fonte: | PLANTA; v. 253, n. 4 APR 2021. |
| Citações Web of Science: | 0 |
| Resumo | |
Main conclusions While two lineages of retrotransposons were more abundant in larger Passiflora genomes, the satellitome was more diverse and abundant in the smallest genome analysed. Repetitive sequences are ubiquitous and fast-evolving elements responsible for size variation and large-scale organization of plant genomes. Within Passiflora genus, a tenfold variation in genome size, not attributed to polyploidy, is known. Here, we applied a combined in silico and cytological approach to study the organization and diversification of repetitive elements in three species of this genus representing its known range in genome size variation. Sequences were classified in terms of type and repetitiveness and the most abundant were mapped to chromosomes. We identified long terminal repeat (LTR) retrotransposons as the most abundant elements in the three genomes, showing a considerable variation among species. Satellite DNAs (satDNAs) were less representative, but highly diverse between subgenera. Our results clearly confirm that the largest genome species (Passiflora quadrangularis) presents a higher accumulation of repetitive DNA sequences, specially Angela and Tekay elements, making up most of its genome. Passiflora cincinnata, with intermediate genome and from the same subgenus, showed similarity with P. quadrangularis regarding the families of repetitive DNA sequences, but in different proportions. On the other hand, Passiflora organensis, the smallest genome, from a different subgenus, presented greater diversity and the highest proportion of satDNA. Altogether, our data indicates that while large genomes evolved by an accumulation of retrotransposons, the smallest genome known for the genus has evolved by diversification of different repeat types, particularly satDNAs. (AU) | |
| Processo FAPESP: | 19/07838-6 - Descobrindo o genoma de Passiflora organensis: uma referência em Passifloraceae e para estudos evolutivos |
| Beneficiário: | Zirlane Portugal da Costa |
| Modalidade de apoio: | Bolsas no Brasil - Pós-Doutorado |