Calcium Signals: The Lead Currency of Plant Information Processing

摘要

Ca²⁺ signals are core transducers and regulators in many adaptation and developmental processes of plants. Ca²⁺ signals are represented by stimulus-specific signatures that result from the concerted action of channels, pumps, and carriers that shape temporally and spatially defined Ca²⁺ elevations. Cellular Ca²⁺ signals are decoded and transmitted by a toolkit of Ca²⁺ binding proteins that relay this information into downstream responses. Major transduction routes of Ca²⁺ signaling involve Ca²⁺-regulated kinases mediating phosphorylation events that orchestrate downstream responses or comprise regulation of gene expression via Ca²⁺-regulated transcription factors and Ca²⁺-responsive promoter elements. Here, we review some of the remarkable progress that has been made in recent years, especially in identifying critical components functioning in Ca²⁺ signal transduction, both at the single-cell and multicellular level. Despite impressive progress in our understanding of the processing of Ca²⁺ signals during the past years, the elucidation of the exact mechanistic principles that underlie the specific recognition and conversion of the cellular Ca²⁺ currency into defined changes in protein–protein interaction, protein phosphorylation, and gene expression and thereby establish the specificity in stimulus response coupling remain to be explored.