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Distinct calcium signaling pathways regulate calmodulin gene expression in tobacco
A H van Der Luit1, C Olivari, A Haley
1Institute for Molecular Cell Biology, University of Amsterdam, Kruislaan 318, 1098 SM Amsterdam, The Netherlands. luit@bio.uva.nl
Plant Physiology
|November 11, 1999
Summary
Cold shock and wind stimuli activate distinct calcium (Ca2+) signaling pathways in tobacco plants. These pathways differentially regulate the expression of a stress-induced calmodulin gene, NpCaM-1, in the nucleus or cytoplasm.
Area of Science:
- Plant molecular biology
- Cell signaling
- Stress responses in plants
Background:
- Environmental stimuli like cold shock and wind trigger calcium (Ca2+) transients in plant cells.
- Understanding the spatial and molecular mechanisms of these Ca2+ signaling pathways is crucial for plant stress adaptation.
Purpose of the Study:
- To investigate whether cold shock and wind stimuli activate spatially distinct Ca2+ signaling pathways in tobacco.
- To compare stress-induced nuclear and cytoplasmic Ca2+ transients and the expression of a stress-induced calmodulin gene.
Main Methods:
- Utilized transgenic tobacco seedlings expressing cytoplasmic (MAQ 2.4) and nuclear-targeted (MAQ 7.11) aequorin for Ca2+ imaging.
- Compared Ca2+ transients and calmodulin gene expression (NpCaM-1 and NpCaM-2) in response to cold shock and wind stimuli.
Main Results:
- Cold shock and wind stimuli were confirmed to activate separate Ca2+ signaling pathways.
- Expression of the NpCaM-1 calmodulin gene, but not NpCaM-2, responded to both stimuli.
- Wind-induced NpCaM-1 expression was primarily regulated by nuclear Ca2+ signaling, while cold shock-induced expression was regulated by cytoplasmic Ca2+ signaling.
Conclusions:
- Tobacco seedlings exhibit distinct Ca2+ signaling pathways for cold shock and wind stimuli.
- The stress-induced calmodulin gene NpCaM-1 is differentially regulated by nuclear and cytoplasmic Ca2+ signaling depending on the stress type.