Calcium: silver bullet in signaling

Area of Science:

• Plant Biology
• Molecular Biology
• Biochemistry

Background:

• Calcium ions (Ca2+) are crucial messengers in plant growth, development, and stress responses.
• Numerous external signals trigger transient increases in cytosolic Ca2+ concentration ([Ca2+]cyt) in plants.

Purpose of the Study:

• To review the identification and function of Ca2+-sensing proteins in plants.
• To explore the novel features and regulatory mechanisms of downstream Ca2+ signaling components in plants.
• To highlight the importance of plant 'signalome' studies for understanding cellular responses.

Main Methods:

• Genetic, biochemical, molecular, and cell biological approaches.
• Identification of Ca2+-sensing proteins and downstream signaling components.
• Functional genomics, including reverse genetics and microarray analyses.
• In vivo protein-protein interaction studies and proteomics.

Main Results:

• Significant progress has been made in identifying plant Ca2+-sensing proteins.
• Plants possess unique Ca2+-sensing proteins with novel downstream signaling pathways.
• Understanding Ca2+ signaling mechanisms is advancing, but functional characterization of many proteins remains limited.

Conclusions:

• Ca2+ signaling is complex in plants, involving unique sensing proteins and regulatory mechanisms.
• Further research, particularly 'signalome' studies and advanced genomics, is needed to fully elucidate Ca2+ signaling networks and their roles in plant responses.
• Functional genomics approaches are key to analyzing Ca2+ signaling components and their interactions.