Is there crosstalk between extracellular and intracellular calcium mobilization in jasmonic acid signaling
2009
Sun, Qing-peng | Yu, Yong-kun | Wan, Shan-xia | Zhao, Fu-kuan | Hao, Yu-lan
The changes in cytosolic Ca²⁺ levels play an important role in the jasmonic acid (JA) signal transduction pathway. We demonstrate that an increase in cytosolic free Ca²⁺ concentration ([Ca²⁺]cyₜ) of Arabidopsis leaf cells was affected by pretreatment with heparin and 3,4,5-trimethoxybenzoic acid 8-(diethylamino)octyl ester (TMB-8). With pretreatment of heparin, an antagonist of inositol 1,4,5-trisphosphate (IP₃) sensitive channels, the basal and JA induced fluorescence of [Ca²⁺]cyₜ were both decreased. Furthermore, heparin and TMB-8, another antagonist of IP₃ sensitive channels, enhanced the JA-induced gene expression of JR1. These data suggest that there may be a fine tune control system between extracellular and intracellular Ca²⁺ mobilization in JA signaling pathway.
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