Data/hora: 19/06/2024 12:19:07

Biblioteca(s): | Embrapa Milho e Sorgo.
Tipo da produção científica: | Artigo em Periódico Indexado
Circulação/Nível: | A - 1
Data corrente: | 09/01/2019
Data da última atualização: | 24/01/2020
Autoria: | MELO, J. O.; MARTINS, L. G. C.; BARROS, B. de A.; PIMENTA, M. R.; LANA, U. G. de P.; DUARTE, C. E. M.; PASTINA, M. M.; GUIMARÃES, C. T.; SCHAFFERT, R. E.; KOCHIAN, L. V.; FONTES, E. P. B.; MAGALHAES, J. V. de.
Afiliação: | Janaina O. Melo, Universidade Federal de Minas Gerais; Laura G. C. Martins, Universidade Federal de Viçosa; BEATRIZ DE ALMEIDA BARROS, CNPMS; Maiana R. Pimenta, Universidade Federal de Viçosa; UBIRACI GOMES DE PAULA LANA, CNPMS; Christiane E. M. Duarte, Universidade Federal de Viçosa; MARIA MARTA PASTINA, CNPMS; CLAUDIA TEIXEIRA GUIMARAES, CNPMS; ROBERT EUGENE SCHAFFERT, CNPMS; Leon V. Kochian, University of Saskatchewan, Canada; Elizabeth P. B. Fontes, Universidade Federal de Viçosa; JURANDIR VIEIRA DE MAGALHAES, CNPMS.
Título: | Repeat variants for the SbMATE transporter protect sorghum roots from aluminum toxicity by transcriptional interplay in cis and trans.
Ano de publicação: | 2019
Fonte/Imprenta: | Proceedings of the National Academy of Sciences of the United States of America, Washington, v. 116, n. 1, p. 313-318, 2019.
DOI: | 10.1073/pnas.1808400115
Idioma: | Inglês
Notas: | Publicado online em 13 dez. 2018.
Conteúdo: | Acidic soils, where aluminum (Al) toxicity is a major agricultural constraint, are globally widespreadand are prevalent in developing countries. In sorghum, the root citrate transporter SbMATE confers Al tolerance by protecting root apices from toxic Al3+, but can exhibit reduced expression when introgressed into different lines. We show that allele-specific SbMATE transactivation occurs and is caused by factors located away from SbMATE. Using expressionQTL mapping and expression genome-wide association mapping, we establish that SbMATE transcription is controlled in a bipartite fashion,primarily incis butalsointrans.Multiallelicpromotertransactivation and ChIP analyses demonstrated that intermolecular effects on SbMATE expression arise from a WRKY and a zinc fingerDHHC transcription factor (TF) that bind to and trans-activate the SbMATE promoter. A haplotype analysis in sorghum RILs indicates that the TFs influence SbMATE expression and Al tolerance. Variation in SbMATE expression likely results from changes in tandemly repeated cis sequences flanking a transposable element (a miniature inverted repeattransposable element)insertion inthe SbMATE promoter, which are recognized by the Al3+-responsive TFs. According to our model, repeat expansion in Al-tolerant genotypes increases TF recruitment and, hence, SbMATE expression, which is, in turn, lower in Al-sensitive genetic backgrounds as a result of lower TF expression and fewer binding sites. We thus show that even dominant cis regulation of an agronomically important gene can be subjected to precise intermolecular finetuning. These concerted cis/trans interactions, which allow the plant to sense and respond to environmental cues, such as Al3+ toxicity, can now be used to increase yields and food security on acidic soils.
Palavras-Chave: | Estresse abiótico; Regulação transcricional; Toxicidade do alumínio.
Thesagro: | Gene; Genética.
Categoria do assunto: | F Plantas e Produtos de Origem Vegetal
Registro original: | Embrapa Milho e Sorgo (CNPMS)
Exemplares: | CNPMS - (28638-1) - UPC - AP - DD -  -  -  - DIS