Ectopic expression of the sesame MYB transcription factor SiMYB75 promotes root growth and modulates ABA-mediated tolerance to drought and salt stresses in Arabidopsis

Dossa Komivi, Mmadi Marie Ali, Zhou Rong, Liu Aili, Yang Yuanxiao, Diouf Diaga, You Jun, Zhang Xiurong. 2020. Ectopic expression of the sesame MYB transcription factor SiMYB75 promotes root growth and modulates ABA-mediated tolerance to drought and salt stresses in Arabidopsis. AoB Plants, 12 (1), 14 p.

https://doi.org/10.1093/aobpla/plz081

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Quartile : Q2, Sujet : ECOLOGY / Quartile : Q2, Sujet : PLANT SCIENCES

Résumé : An increasing number of candidate genes related to abiotic stress tolerance are being discovered and proposed to improve the existing cultivars of the high oil-bearing crop sesame (Sesamum indicum L.). However, the in planta functional validation of these genes is remarkably lacking. In this study, we cloned a novel sesame R2-R3 MYB gene SiMYB75 which is strongly induced by drought, sodium chloride (NaCl), abscisic acid (ABA) and mannitol. SiMYB75 is expressed in various sesame tissues, especially in root and its protein is predicted to be located in the nucleus. Ectopic over-expression of SiMYB75 in Arabidopsis notably promoted root growth and improved plant tolerance to drought, NaCl and mannitol treatments. Furthermore, SiMYB75 over-expressing lines accumulated higher content of ABA than wild-type plants under stresses and also increased sensitivity to ABA. Physiological analyses revealed that SiMYB75 confers abiotic stress tolerance by promoting stomatal closure to reduce water loss; inducing a strong reactive oxygen species scavenging activity to alleviate cell damage and apoptosis; and also, up-regulating the expression levels of various stress-marker genes in the ABA-dependent pathways. Our data suggested that SiMYB75 positively modulates drought, salt and osmotic stresses responses through ABA-mediated pathways. Thus, SiMYB75 could be a promising candidate gene for the improvement of abiotic stress tolerance in crop species including sesame.

Mots-clés Agrovoc : expression des gènes, tolérance à la sécheresse, Sesamum indicum, tolérance au sel, stress osmotique, stress abiotique, résistance à la sécheresse, stress dû à la sécheresse, facteurs abiotiques, Transcription génique, Arabidopsis, biotechnologie végétale, transformation génétique

Mots-clés libres : Abiotic stress, Abscisic acid, MYB transcription factors, Root growth, Sesamum indicum, SiMYB75

Agences de financement hors UE : China Agriculture research System, Agricultural Science and Technology Innovation Project of Agricultural Sciences, National Natural Science Foundation of China

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