Abstract
Plants as non-mobile organisms constantly integrate varying environmental signals to flexibly adapt their growth and development. Local fluctuations in water and nutrient availability, sudden changes in temperature or other abiotic and biotic stresses can trigger changes in the growth of plant organs. Multiple mutually interconnected hormonal signaling cascades act as essential endogenous translators of these exogenous signals in the adaptive responses of plants. Although the molecular backbones of hormone transduction pathways have been identified, the mechanisms underlying their interactions are largely unknown. Here, using genome wide transcriptome profiling we identify an auxin and cytokinin cross-talk component; SYNERGISTIC ON AUXIN AND CYTOKININ 1 (SYAC1), whose expression in roots is strictly dependent on both of these hormonal pathways. We show that SYAC1 is a regulator of secretory pathway, whose enhanced activity interferes with deposition of cell wall components and can fine-tune organ growth and sensitivity to soil pathogens.
Publication types
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Research Support, Non-U.S. Gov't
MeSH terms
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Arabidopsis / genetics
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Arabidopsis / growth & development
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Arabidopsis / metabolism*
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Arabidopsis Proteins / genetics
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Arabidopsis Proteins / metabolism*
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Cell Wall / chemistry
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Cell Wall / metabolism
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Cytokinins / metabolism*
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Disease Resistance / genetics*
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Endosomes / metabolism
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Gene Expression Profiling
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Gene Expression Regulation, Plant / genetics
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Golgi Apparatus / metabolism
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Indoleacetic Acids / metabolism*
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Membrane Proteins / genetics
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Membrane Proteins / metabolism*
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Plant Growth Regulators / metabolism*
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Plant Roots / metabolism*
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Plant Roots / microbiology
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Plants, Genetically Modified / metabolism
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Plasmodiophorida / pathogenicity
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Secretory Pathway / genetics
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Soil
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Transcriptome / genetics*
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Vesicular Transport Proteins / metabolism
Substances
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AT2G18840 protein, Arabidopsis
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AT4G30260 protein, Arabidopsis
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Arabidopsis Proteins
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Cytokinins
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ECHIDNA protein, Arabidopsis
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Indoleacetic Acids
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Membrane Proteins
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Plant Growth Regulators
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SYAC1 protein, Arabidopsis
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Soil
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Vesicular Transport Proteins