Calcium at the Crossroads of Signaling

Fluorescence Resonance Energy Transfer-Sensitized Emission of Yellow Cameleon 3.60 Reveals Root Zone-Specific Calcium Signatures in Arabidopsis in Response to Aluminum and Other Trivalent Cations

“…The reason for differences in [Ca 2+ ] cyt responses among the different root developmental zones upon Al 3+ application remains unclear. However, one possibility is that cells from each root developmental region differ in their efficiency in removing Ca 2+ because of differences in the expression of Ca 2+ -ATPases in the plasma membrane and/or endoplasmic reticulum and Ca 2+ /H + exchangers in the plasma membrane and tonoplast (Sze et al, 2000;Sanders et al, 2002). Another possibility is that cells in the different root regions express certain receptor proteins that perceive the applied chemical signal, which in turn activate a specific type of Ca 2+ channel (Kiegle et al, 2000a currents in plants (Kiegle et al, 2000a;Demidchik et al, 2002;Qu et al, 2007) Fig.…”

“…The role of calcium ions (Ca 2+ ) as a ubiquitous cellular messenger in animal and plant cells is well established (Berridge et al, 2000;Sanders et al, 2002;Ng and McAinsh, 2003). Cellular signal transduction pathways are elicited as a result of fluctuations of free Ca 2+ in the cytoplasm ([Ca 2+ ] cyt ) in response to external and intracellular signals.…”

Genetic approaches towards overcoming water deficit in plants - special emphasis on LEAs

“…IP3-gated Ca 2+ channels have been implicated in dehydration and salt stress-induced cytosolic Ca 2+ elevations (De Wald et al, 2001;Takahashi et al, 2001). The Ca 2+ signaling circuit has been postulated to consists of three major ''nodes'' -generation of a Ca 2+ signature in response to a signal, recognition of the signature by Ca 2+ sensors, and the further transduction of the signature message to downstream targets that participate in producing signal-specific responses (Reddy and Reddy, 2004 proteins without EF-hand motifs (Reddy, 2001;Sanders et al, 2002;Ray et al, 2007). Gene expression in both plants and animals is regulated via Ca 2+ /calmodulin interaction with transcription factors or via specific protein kinases.…”

Plant Stress Surveillance Monitored by ABA and Disease Signaling Interactions

“…By changing amplitude, duration, and frequency of Ca 2+ transients accordingly to environmental and developmental stimuli, plant cells interpret the source of input signals and then produce proper responses (Dodd et al, 2010;Sanders et al, 2002). Considering various responses controlled by Ca 2+ signals, plant genome is expected to encode diverse Ca 2+ sensors and mechanisms to transmit the general secondary signals to specific target components.…”