Phytohormone ethylene-responsive Arabidopsis organ growth under light is in the fine regulation of Photosystem II deficiency-inducible AKIN10 expression

• Published in: Scientific reports 2017-06, Vol.7 (1), p.2767-12, Article 2767
• Main Authors: Kim, Geun-Don, Cho, Young-Hee, Yoo, Sang-Dong
• Format: Article
• Language: English
• Subjects: 14; 38; 631/449/1736; 631/449/2675; Alleles; Arabidopsis; Arabidopsis - physiology; Arabidopsis Proteins - genetics; Arabidopsis Proteins - metabolism; Energy conservation; Energy Metabolism; Ethylene; Ethylenes - metabolism; Gene Deletion; Gene Expression Regulation, Plant; Genotype; Humanities and Social Sciences; Light; multidisciplinary; Phenotype; Photochemical Processes; Photosynthesis; Photosystem II; Photosystem II Protein Complex - genetics; Photosystem II Protein Complex - metabolism; Phytohormones; Plant Development; Plant Growth Regulators - metabolism; Plant hormones; Protein-Serine-Threonine Kinases - genetics; Protein-Serine-Threonine Kinases - metabolism; Science; Science (multidisciplinary); Transgenic plants
• ISSN: 2045-2322; 2045-2322
• DOI: 10.1038/s41598-017-02897-5

For photoautotrophic plants, light-dependent photosynthesis plays an important role in organismal growth and development. Under light, Arabidopsis hypocotyl growth is promoted by the phytohormone ethylene. Despite well-characterized ethylene signaling pathways, the functions of light in the hormone-inducible growth response still remain elusive. Our cell-based functional and plant-system-based genetic analyses with biophysical and chemical tools showed that a chemical blockade of photosystem (PS) II activity affects ethylene-induced hypocotyl response under light. Interestingly, ethylene responsiveness modulates PSII activity in retrospect. The lack of ethylene responsiveness-inducible PSII inefficiency correlates with the induction of AKIN10 expression. Consistently, overexpression of AKIN10 in transgenic plants suppresses ethylene-inducible hypocotyl growth promotion under illumination as in other ethylene-insensitive mutants. Our findings provide information on how ethylene responsiveness-dependent photosynthetic activity controls evolutionarily conserved energy sensor AKIN10 that fine-tunes EIN3-mediated ethylene signaling responses in organ growth under light.