SYNERGISTIC ON AUXIN AND CYTOKININ 1 positively regulates growth and attenuates soil pathogen resistance
Andrej Hurný, Candela Cuesta, Nicola Cavallari, Krisztina Ötvös, Jérôme Duclercq, Ladislav Dokládal, Juan Carlos Montesinos, Marçal Gallemí, Hana Semerádová, Thomas Rauter, Irene Stenzel, Geert Persiau, Freia Benade, Rishikesh Bhalearo, Eva Sýkorová, András Gorzsás, Julien Séchet, Grégory Mouille, Ingo Heilmann, Geert De Jaeger, Jutta Ludwig‐Müller, Eva Benková
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.