Defining the combined stress response in wild Arachis

Zotta Mota Ana, Brasileiro Ana Christina Miranda, Vidigal Bruna S., Oliveira Thais Nicolini, Andressa da Cunha Quintana Martins, Passos Saraiva Mario A., Guerra de Araújo Ana Claudia, Togawa Roberto Coiti, Grossi-de-Sa Maria Fatima, Guimarães Patricia Messenberg. 2021. Defining the combined stress response in wild Arachis. Scientific Reports, 11 (1), 12 p.

Quartile : Q2, Sujet : MULTIDISCIPLINARY SCIENCES

Résumé : Nematodes and drought are major constraints in tropical agriculture and often occur simultaneously. Plant responses to these stresses are complex and require crosstalk between biotic and abiotic signaling pathways. In this study, we explored the transcriptome data of wild Arachis species subjected to drought (A-metaDEG) and the root-knot nematode Meloidogyne arenaria (B-metaDEG) via meta-analysis, to identify core-stress responsive genes to each individual and concurrent stresses in these species. Transcriptome analysis of a nematode/drought bioassay (cross-stress) showed that the set of stress responsive DEGs to concurrent stress is distinct from those resulting from overlapping A- and B-metaDEGs, indicating a specialized and unique response to combined stresses in wild Arachis. Whilst individual biotic and abiotic stresses elicit hormone-responsive genes, most notably in the jasmonic and abscisic acid pathways, combined stresses seem to trigger mainly the ethylene hormone pathway. The overexpression of a cross-stress tolerance candidate gene identified here, an endochitinase-encoding gene (AsECHI) from Arachis stenosperma, reduced up to 30% of M. incognita infection and increased post-drought recovery in Arabidopsis plants submitted to both stresses. The elucidation of the network of cross-stress responsive genes in Arachis contributes to better understanding the complex regulation of biotic and abiotic responses in plants facilitating more adequate crop breeding for combined stress tolerance.

Mots-clés Agrovoc : expression des gènes, résistance à la sécheresse, amélioration des plantes, stress abiotique, génie génétique, changement climatique, stress biotique, stress dû à la sécheresse, résistance génétique, mécanisme de défense, Arachis, adaptation aux changements climatiques, hormone, tolérance à la sécheresse, plante sauvage

Agences de financement hors UE : Empresa Brasileira de Pesquisa Agropecuária, Universidade Católica de Brasília, Conselho Nacional de Desenvolvimento Científico e Tecnológico, Coordenação de Aperfeiçoamento de Pessoal de Nível Superior, Fundação de Apoio à Pesquisa do Distrito Federal

Auteurs et affiliations

• Zotta Mota Ana, CIRAD-BIOS-UMR AGAP (FRA)
• Brasileiro Ana Christina Miranda, EMBRAPA (BRA)
• Vidigal Bruna S., UNB [Universidade de Brasilia] (BRA)
• Oliveira Thais Nicolini, EMBRAPA (BRA)
• Andressa da Cunha Quintana Martins, EMBRAPA (BRA)
• Passos Saraiva Mario A., EMBRAPA (BRA)
• Guerra de Araújo Ana Claudia, EMBRAPA (BRA)
• Togawa Roberto Coiti, EMBRAPA (BRA)
• Grossi-de-Sa Maria Fatima, EMBRAPA (BRA)
• Guimarães Patricia Messenberg, EMBRAPA (BRA) - auteur correspondant

Source : Cirad-Agritrop (https://agritrop.cirad.fr/605879/)

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