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Calmodulin 1 Regulates Senescence and ABA Response in Arabidopsis

Title
Calmodulin 1 Regulates Senescence and ABA Response in Arabidopsis
Authors
Dai, ChengLee, YureeLee, In C.Nam, Hong GilKwak, June Myoung
DGIST Authors
Nam, Hong GilKwak, June Myoung
Issue Date
2018-07
Citation
Frontiers in Plant Science, 9
Type
Article
Article Type
Article
Keywords
calmodulin 1NADPH oxidasereactive oxygen speciesRPK1senescenceINDUCED STOMATAL CLOSURENADPH OXIDASE ATRBOHDLEAF SENESCENCEABSCISIC-ACIDHYDROGEN-PEROXIDERECEPTOR KINASEGENE-EXPRESSIONNITRIC-OXIDEGUARD-CELLSCALCIUM
ISSN
1664-462X
Abstract
Cellular calcium acts as a second messenger and regulates diverse developmental events and stress responses. Cytosolic calcium has long been considered as an important regulator of senescence, however, the role of Ca2+ in plant senescence has remained elusive. Here we show that the Calmodulin 1 (CaM1) gene, which encodes Ca2+-binding protein calmodulin 1, positively regulates leaf senescence in Arabidopsis. Yellowing of leaves, accumulation of reactive oxygen species (ROS), and expression of the senescence-associated gene 12 (SAG12) were significantly enhanced in CaM1 overexpression plants. In contrast, abscisic acid (ABA)-triggered ROS production and stomatal closure were reduced in amiRNA-CaM1 plants. We found a positive-feedback regulation loop among three signaling components, CaM1, RPK1, and RbohF, which physically associate with each other. RPK1 positively regulates the expression of the CaM1 gene, and the CaM1 protein, in turn, up-regulates RbohF gene expression. Interestingly, the expression of CaM1 was down-regulated in rbohD, rbohF, and rbohD/F mutants. We show that CaM1 positively regulates ROS production, leaf senescence, and ABA response in Arabidopsis. © 2018 Dai, Lee, Lee, Nam and Kwak.
URI
http://hdl.handle.net/20.500.11750/9008
DOI
10.3389/fpls.2018.00803
Publisher
Frontiers Media S.A.
Related Researcher
  • Author Kwak, June Myoung KWAK_LAB(Lab of Cell Signailng & Development)
  • Research Interests Calcium Signaling; ABA;ROS Signaling; drought-tolerant plants; Development of Abscission; Culluar Features; Signaling network; Environmental Regulation
Files:
Collection:
Department of New BiologyCBRG(Complex Biology Research Group)1. Journal Articles
Department of New BiologyKWAK_LAB(Lab of Cell Signailng & Development)1. Journal Articles


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