Distinct Calcium Signaling Pathways Regulate Calmodulin Gene Expression in Tobacco

Distinct Calcium Signaling Pathways Regulate Calmodulin Gene Expression in Tobacco Cold shock and wind stimuli initiate Ca 2+ transients in transgenic tobacco ( Nicotiana plumbaginifolia) seedlings (named MAQ 2.4) containing cytoplasmic aequorin. To investigate whether these stimuli initiate Ca 2+ pathways that are spatially distinct, stress-induced nuclear and cytoplasmic Ca 2+ transients and the expression of a stress-induced calmodulin gene were compared. Tobacco seedlings were transformed with a construct that encodes a fusion protein between nucleoplasmin (a major oocyte nuclear protein) and aequorin. Immunocytochemical evidence indicated targeting of the fusion protein to the nucleus in these plants, which were named MAQ 7.11. Comparison between MAQ 7.11 and MAQ 2.4 seedlings confirmed that wind stimuli and cold shock invoke separate Ca 2+ signaling pathways. Partial cDNAs encoding two tobacco calmodulin genes, NpCaM-1 and NpCaM-2 , were identified and shown to have distinct nucleotide sequences that encode identical polypeptides. Expression of NpCaM-1 , but not NpCaM-2 , responded to wind and cold shock stimulation. Comparison of the Ca 2+ dynamics with NpCaM-1 expression after stimulation suggested that wind-induced NpCaM-1 expression is regulated by a Ca 2+ signaling pathway operational predominantly in the nucleus. In contrast, expression of NpCaM-1 in response to cold shock is regulated by a pathway operational predominantly in the cytoplasm. http://www.deepdyve.com/assets/images/DeepDyve-Logo-lg.png

Distinct Calcium Signaling Pathways Regulate Calmodulin Gene Expression in Tobacco

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Publisher
American Society of Plant Biologist
Copyright
Copyright © 2015 by the American Society of Plant Biologists
ISSN
1532-2548
eISSN
0032-0889
D.O.I.
10.1104/pp.121.3.705
Publisher site
See Article on Publisher Site

Abstract

Cold shock and wind stimuli initiate Ca 2+ transients in transgenic tobacco ( Nicotiana plumbaginifolia) seedlings (named MAQ 2.4) containing cytoplasmic aequorin. To investigate whether these stimuli initiate Ca 2+ pathways that are spatially distinct, stress-induced nuclear and cytoplasmic Ca 2+ transients and the expression of a stress-induced calmodulin gene were compared. Tobacco seedlings were transformed with a construct that encodes a fusion protein between nucleoplasmin (a major oocyte nuclear protein) and aequorin. Immunocytochemical evidence indicated targeting of the fusion protein to the nucleus in these plants, which were named MAQ 7.11. Comparison between MAQ 7.11 and MAQ 2.4 seedlings confirmed that wind stimuli and cold shock invoke separate Ca 2+ signaling pathways. Partial cDNAs encoding two tobacco calmodulin genes, NpCaM-1 and NpCaM-2 , were identified and shown to have distinct nucleotide sequences that encode identical polypeptides. Expression of NpCaM-1 , but not NpCaM-2 , responded to wind and cold shock stimulation. Comparison of the Ca 2+ dynamics with NpCaM-1 expression after stimulation suggested that wind-induced NpCaM-1 expression is regulated by a Ca 2+ signaling pathway operational predominantly in the nucleus. In contrast, expression of NpCaM-1 in response to cold shock is regulated by a pathway operational predominantly in the cytoplasm.

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