| Journal: | Genetics and molecular biology |
| Database: | PERIÓDICA |
| System number: | 000459146 |
| ISSN: | 1415-4757 |
| Authors: | Jardim Messeder, Douglas1 Caverzan, Andreia2 Bastos, Gabriel Afonso1 Galhego, Vanessa1 Souza Vieira, Ygor de1 Lazzarotto, Fernanda2 Felix Mendes, Esther1 Lavaquial, Lucas1 Nicomedes Junior, José1 Margis Pinheiro, Márcia2 Sachetto Martins, Gilberto1 |
| Institutions: | 1Universidade Federal do Rio de Janeiro, Departamento de Genetica, Rio de Janeiro. Brasil 2Universidade Federal do Rio Grande do Sul, Departamento de Genetica, Porto Alegre, Rio Grande do Sul. Brasil |
| Year: | 2023 |
| Volumen: | 46 |
| Number: | 1 |
| Country: | Brasil |
| Language: | Inglés |
| Document type: | Artículo |
| Approach: | Experimental, analítico |
| English abstract | Ascorbate peroxidases (APXs) are heme peroxidases involved in the control of hydrogen peroxide levels and signal transduction pathways related to development and stress responses. Here, a total of 238 APX, 30 APX-related (APX-R), and 34 APX-like (APX-L) genes were identified from 24 species from the Poaceae family. Phylogenetic analysis of APX indicated five distinct clades, equivalent to cytosolic (cAPX), peroxisomal (pAPX), mitochondrial (mitAPX), stromal (sAPX), and thylakoidal (tAPX) isoforms. Duplication events contributed to the expansion of this family and the divergence times. Different from other APX isoforms, the emergence of Poaceae mitAPXs occurred independently after eudicot and monocot divergence. Our results showed that the constitutive silencing of mitAPX genes is not viable in rice plants, suggesting that these isoforms are essential for rice regeneration or development. We also obtained rice plants silenced individually to sAPX isoforms, demonstrating that, different to plants double silenced to both sAPX and tAPX or single silenced to tAPX previously obtained, these plants do not show changes in the total APX activity and hydrogen peroxide content in the shoot. Among rice plants silenced to different isoforms, plants silenced to cAPX showed a higher decrease in total APX activity and an increase in hydrogen peroxide levels. These results suggest that the cAPXs are the main isoforms responsible for regulating hydrogen peroxide levels in the cell, whereas in the chloroplast, this role is provided mainly by the tAPX isoform. In addition to broadening our understanding of the core components of the antioxidant defense in Poaceae species, the present study also provides a platform for their functional characterization |
| Disciplines: | Biología |
| Keyword: | Angiospermas, Evolución y filogenia, Genética, Poaceae, Genoma, Ascorbato peroxidasa |
| Keyword: | Angiosperms, Evolution and phylogeny, Genetics, Ascorbate peroxidase, Poaceae, Genome |
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