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2. The tomato Ethylene Response Factor Sl-ERF.B3 integrates ethylene and auxin signaling via direct regulation of Sl-Aux/IAA27

Author

Jun-Hye Shin, Yao Chen, Mingchun Liu, Mondher Bouzayen, Mohamed Zouine, Ya Chen, Corinne Audran, Isabelle Mila, Julien Pirrello, Sichuan University [Chengdu] (SCU), Génomique et Biotechnologie des Fruits (GBF), Institut National de la Recherche Agronomique (INRA)-École nationale supérieure agronomique de Toulouse [ENSAT]-Institut National Polytechnique (Toulouse) (Toulouse INP), Université Fédérale Toulouse Midi-Pyrénées-Université Fédérale Toulouse Midi-Pyrénées, Laboratoire des interactions plantes micro-organismes (LIPM), Institut National de la Recherche Agronomique (INRA)-Centre National de la Recherche Scientifique (CNRS), National Key R&D Program of China (2016YFD0400100), the National Natural Science Foundation of China (31772372), the Labex TULIP (ANR‐10‐LABX‐41), European Project: 679796,H2020,H2020-SFS-2015-2,TomGEM(2016), Institut National de la Recherche Agronomique (INRA)-École nationale supérieure agronomique de Toulouse (ENSAT), Institut National Polytechnique (Toulouse) (Toulouse INP), Université de Toulouse (UT)-Université de Toulouse (UT)-Institut National Polytechnique (Toulouse) (Toulouse INP), Université de Toulouse (UT)-Université de Toulouse (UT), and ANR-10-LABX-0041,TULIP,Towards a Unified theory of biotic Interactions: the roLe of environmental(2010)

Subjects
0106 biological sciences, 0301 basic medicine, Chlorophyll, Ethylene, Physiology, Repressor, Down-Regulation, Plant Science, Solanum lycopersicum (tomato), Aux/IAA, Genes, Plant, 01 natural sciences, Plant Roots, Auxin signaling, 03 medical and health sciences, chemistry.chemical_compound, Transactivation, Solanum lycopersicum, Auxin, Gene Expression Regulation, Plant, Gene expression, [SDV.BV]Life Sciences [q-bio]/Vegetal Biology, Hormonal cross‐talk, Ethylene Response Factor (ERF), Promoter Regions, Genetic, Crosses, Genetic, Genes, Dominant, Plant Proteins, chemistry.chemical_classification, Indoleacetic Acids, Chemistry, fungi, food and beverages, Ethylenes, Plants, Genetically Modified, Cell biology, 030104 developmental biology, Seedlings, Fertilization, Ectopic expression, Signal transduction, 010606 plant biology & botany, Hormone, Signal Transduction
Abstract

International audience; Plant growth and development is coordinated by complex networks of interacting hormones, and cross‐talk between ethylene and auxin signaling is essential for a wide range of plant developmental processes. Nevertheless, the molecular links underlying the interaction between the two hormones remain poorly understood. In order to decipher the cross‐talk between the Ethylene Response Factor Sl‐ERF.B3 and Sl‐IAA27, mediating ethylene and auxin signaling, respectively, we combined reverse genetic approaches, physiological methods, transactivation experiments and electrophoretic mobility shift assays. Sl‐ERF.B3 is responsive to both ethylene and auxin and ectopic expression of its dominant repressor version (ERF.B3‐SRDX) results in impaired sensitivity to auxin with phenotypes recalling those previously reported for Sl‐IAA27 downregulated tomato lines. The expression of Sl‐IAA27 is dramatically reduced in the ERF.B3‐SRDX lines and Sl‐ERF.B3 is shown to regulate the expression of Sl‐IAA27 via direct binding to its promoter. The data support a model in which the ethylene‐responsive Sl‐ERF.B3 integrates ethylene and auxin signaling via regulation of the expression of the auxin signaling component Sl‐IAA27. The study uncovers a molecular mechanism that links ethylene and auxin signaling in tomato.

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