Tseng, Ching-Ying , Aung, Kyaw , Chiou, Tzyy-Jen .
Is calcium involved in the phosphate signaling?
In spite of a crucial role of calcium in cell signaling, the involvement of calcium in phosphate signaling in plants has not been elucidated. The recent study showed that the mutation in both two tonoplast calcium exchangers, CAX1 and CAX3, displayed increased phosphate, manganese, and zinc and reduced calcium and magnesium accumulation in the shoot (Cheng et al., 2005). Increased accumulation of phosphate in the cax1/cax3 double mutant implies that calcium may be involved in the proper phosphate signaling or in regulating phosphate responses. In consistent with higher phosphate accumulation, the cax1/cax3 mutant displayed enhanced phosphate uptake activity. Moreover, the expression of several phosphate starvation-responsive genes, including genes encoding several phosphate transporters, was altered in the cax1/cax3 mutant. We hypothesize that the mutation of tonoplast major calcium exchangers will disturb the calcium resting levels in the cytosol and alter the expression of these phosphate responsive genes. More detailed analyses are underway to reveal the role of calcium in phosphate signaling pathways.
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1 - Academia Sinica, Agricultural Biotechnology Research Center, 128 Sec.2, academia Rd, Nankang, Taipei, 115, Taiwan
2 - Academia Sinica, Molecular and Biological Agricultural Science Program, Taiwan International Graduate Program
3 - Academia Sinica, Agricultural Biotechnology Research Center
Presentation Type: Plant Biology Abstract
Location: Exhibit Hall (Northeast, Southwest & Southeast)/Hilton
Date: Sunday, July 8th, 2007
Time: 8:00 AM