Oscillation regulation of Ca2+ /calmodulin and heat-stress related genes in response to heat stress in rice (Oryza sativa L.).
The Ca ( 2+) /calmodulin (CaM) signaling pathway mediates the heat stress (HS) response and acquisition of thermotolerance in plants. We showed that the rice CaM1-1 isoform can interpret a Ca ( 2+)  signature difference in amplitude, frequency, and temporal-spatial properties in regulating transcription of nucleoplasmic small heat-shock protein gene (sHSPC/N) during HS. Ca ( 2+)  and A23187 treatments under HS generated an intense and sustained increase in [Ca ( 2+) ]cyt and accelerated the expression of CaM1-1 and sHSPC/N genes, which suggests that HS-induced apoplastic Ca ( 2+)  influx was responsible for the [Ca ( 2+) ]cyt transient and downstream HS signaling. Here, we discuss an emerging paradigm in the oscillation regulation of CaM1-1 expression during HS and highlight the areas that need further investigation.
Institute of Plant Biology and Department of Life Science, National Taiwan University, Taipei, Taiwan.
Hui-Chen
HC
Wu
Tsung-Luo
TL
Jinn
D000222:Adaptation, Physiological / Q000235:genetics; D000001:Calcimycin / Q000494:pharmacology; D002118:Calcium / Q000378:metabolism* / Q000494:pharmacology; D061207:Calcium Ionophores / Q000494:pharmacology; D020013:Calcium Signaling; D002147:Calmodulin / Q000235:genetics* / Q000378:metabolism; D018506:Gene Expression Regulation, Plant / Q000187:drug effects; D017343:Genes, Plant; D050888:Heat-Shock Proteins, Small / Q000235:genetics* / Q000378:metabolism; D006358:Hot Temperature; D012275:Oryza / Q000235:genetics* / Q000378:metabolism; D010940:Plant Proteins / Q000235:genetics / Q000378:metabolism; D020033:Protein Isoforms; D013312:Stress, Physiological / Q000235:genetics; D014158:Transcription, Genetic
D061207:Calcium Ionophores; D002147:Calmodulin; D050888:Heat-Shock Proteins, Small; D010940:Plant Proteins; D020033:Protein Isoforms; D000001:Calcimycin; D002118:Calcium