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Arabidopsis transcriptional response to extracellular Ca 2+ depletion involves a transient rise in cytosolic Ca 2+
Author(s) -
Wang Jing,
Tergel Tergel,
Chen Jianhua,
Yang Ju,
Kang Yan,
Qi Zhi
Publication year - 2015
Publication title -
journal of integrative plant biology
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 2.734
H-Index - 83
eISSN - 1744-7909
pISSN - 1672-9072
DOI - 10.1111/jipb.12218
Subject(s) - extracellular , cytosol , arabidopsis , calcium , microbiology and biotechnology , phospholipase , transient receptor potential channel , chemistry , biology , receptor , biochemistry , gene , mutant , enzyme , organic chemistry
Ecological evidence indicates a worldwide trend of dramatically decreased soil Ca 2+ levels caused by increased acid deposition and massive timber harvesting. Little is known about the genetic and cellular mechanism of plants' responses to Ca 2+ depletion. In this study, transcriptional profiling analysis helped identify multiple extracellular Ca 2+ ([Ca 2+ ] ext ) depletion‐responsive genes in Arabidopsis thaliana L., many of which are involved in response to other environmental stresses. Interestingly, a group of genes encoding putative cytosolic Ca 2+ ([Ca 2+ ] cyt ) sensors were significantly upregulated, implying that [Ca 2+ ] cyt has a role in sensing [Ca 2+ ] ext depletion. Consistent with this observation, [Ca 2+ ] ext depletion stimulated a transient rise in [Ca 2+ ] cyt that was negatively influenced by [K + ] ext , suggesting the involvement of a membrane potential‐sensitive component. The [Ca 2+ ] cyt response to [Ca 2+ ] ext depletion was significantly desensitized after the initial treatment, which is typical of a receptor‐mediated signaling event. The response was insensitive to an animal Ca 2+ sensor antagonist, but was suppressed by neomycin, an inhibitor of phospholipase C. Gd 3+ , an inhibitor of Ca 2+ channels, suppressed the [Ca 2+ ] ext ‐triggered rise in [Ca 2+ ] cyt and downstream changes in gene expression. Taken together, this study demonstrates that [Ca 2+ ] cyt plays an important role in the putative receptor‐mediated cellular and transcriptional response to [Ca 2+ ] ext depletion of plant cells.