Illuminating light, cytokinin, and ethylene signalling crosstalk in plant development

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Authors

ŽĎÁRSKÁ Markéta DOBISOVÁ Tereza GELOVÁ Zuzana PERNISOVÁ Markéta DABRAVOLSKI Siarhei HEJÁTKO Jan

Year of publication 2015
Type Article in Periodical
Magazine / Source Journal of Experimental Botany
MU Faculty or unit

Central European Institute of Technology

Citation
Web http://jxb.oxfordjournals.org/content/early/2015/05/27/jxb.erv261.abstract
Doi http://dx.doi.org/10.1093/jxb/erv261
Field Genetics and molecular biology
Keywords crosstalk; light; cytokinin; ethylene; multispet phosphorelay; development
Description Integrating important environmental signals with intrinsic developmental programmes is a crucial adaptive requirement for plant growth, survival, and reproduction. Key environmental cues include changes in several light variables, while important intrinsic (and highly interactive) regulators of many developmental processes include the phytohormones cytokinins (CKs) and ethylene. Here, we discuss the latest discoveries regarding the molecular mechanisms mediating CK/ethylene crosstalk at diverse levels of biosynthetic and metabolic pathways and their complex interactions with light. Furthermore, we summarize evidence indicating that multiple hormonal and light signals are integrated in the multistep phosphorelay (MSP) pathway, a backbone signalling pathway in plants. Inter alia, there are strong overlaps in subcellular localizations and functional similarities in components of these pathways, including receptors and various downstream agents. We highlight recent research demonstrating the importance of CK/ethylene/light crosstalk in selected aspects of plant development, particularly seed germination and early seedling development. The findings clearly demonstrate the crucial integration of plant responses to phytohormones and adaptive responses to environmental cues. Finally, we tentatively identify key future challenges to refine our understanding of the molecular mechanisms mediating crosstalk between light and hormonal signals, and their integration during plant life cycles.
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