Coupling diurnal cytosolic Ca2+ oscillations to the CAS-IP3 pathway in Arabidopsis.

Journal Article (Journal Article)

Various signaling pathways rely on changes in cytosolic calcium ion concentration ([Ca2+]i). In plants, resting [Ca2+]i oscillates diurnally. We show that in Arabidopsis thaliana, [Ca2+]i oscillations are synchronized to extracellular Ca2+ concentration ([Ca2+]o) oscillations largely through the Ca2+-sensing receptor CAS. CAS regulates concentrations of inositol 1,4,5-trisphosphate (IP3), which in turn directs release of Ca2+ from internal stores. The oscillating amplitudes of [Ca2+]o and [Ca2+]i are controlled by soil Ca2+ concentrations and transpiration rates. The phase and period of oscillations are likely determined by stomatal conductance. Thus, the internal concentration of Ca2+ in plant cells is constantly being actively revised.

Full Text

Duke Authors

Cited Authors

  • Tang, R-H; Han, S; Zheng, H; Cook, CW; Choi, CS; Woerner, TE; Jackson, RB; Pei, Z-M

Published Date

  • March 2007

Published In

Volume / Issue

  • 315 / 5817

Start / End Page

  • 1423 - 1426

PubMed ID

  • 17347443

Electronic International Standard Serial Number (EISSN)

  • 1095-9203

International Standard Serial Number (ISSN)

  • 0036-8075

Digital Object Identifier (DOI)

  • 10.1126/science.1134457


  • eng