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The Actin-Related Protein2/3 Complex Regulates Mitochondrial-Associated Calcium Signaling during Salt Stress in Arabidopsis
Yi Zhao, Zhen Pan, Yan Zhang, Xiaolu Qu, Yuguo Zhang, Yongqing Yang, Xiangning Jiang, Shanjin Huang, Ming Yuan, Karen S. Schumaker and Yan Guo
The Plant Cell
Vol. 25, No. 11 (NOVEMBER 2013), pp. 4544-4559
Published by: American Society of Plant Biologists (ASPB)
Stable URL: http://www.jstor.org/stable/23598489
Page Count: 16
You can always find the topics here!Topics: Seedlings, Mitochondria, Plant cells, Actins, Microfilaments, Calcium, Protoplasts, Plants, Salts, Cotyledons
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Microfilament and Ca 2+ dynamics play important roles in stress signaling in plants. Through genetic screening of Arabidopsis thaliana mutants that are defective in stress-induced increases in cytosolic Ca 2+ ([Ca 2+ ] cyt ), we identified Actin-Related Protein2 (Arp2) as a regulator of [Ca 2+ ] cyt in response to salt stress. Plants lacking Arp2 or other proteins in the Arp2/3 complex exhibited enhanced salt-induced increases in [Ca 2+ ] cyt , decreased mitochondria movement, and hypersensitivity to salt. In addition, mitochondria aggregated, the mitochondrial permeability transition pore opened, and mitochondrial membrane potential ψm was impaired in the arp2 mutant, and these changes were associated with salt-induced cell death. When opening of the enhanced mitochondrial permeability transition pore was blocked or increases in [Ca 2+ ] cyt were prevented, the salt-sensitive phenotype of the arp2 mutant was partially rescued. These results indicate that the Arp2/3 complex regulates mitochondrial-dependent Ca 2+ signaling in response to salt stress.
The Plant Cell © 2013 American Society of Plant Biologists (ASPB)