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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
Stable URL: http://www.jstor.org/stable/23598489
Page Count: 16
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Since scans are not currently available to screen readers, please contact JSTOR User Support for access. We'll provide a PDF copy for your screen reader.
The Actin-Related Protein2/3 Complex Regulates Mitochondrial-Associated Calcium Signaling during Salt Stress in Arabidopsis
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Abstract

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.

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