Plant Physiol. Journal of Pharmacology and Experimental Therapeutics
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PLANT PHYSIOLOGY , Vol 111, Issue 2 459-467, Copyright © 1996 by American Society of Plant Biologists

CELL BIOLOGY AND SIGNAL TRANSDUCTION

Mastoparan-Induced Intracellular Ca2+ Fluxes May Regulate Cell-to-Cell Communication in Plants

E. B. Tucker and W. F. Boss
Department of Natural Sciences, Baruch College, 17 Lexington Avenue, New York, New York 10010 (E.B.T.)

The relationship of Ca2+ and plasmodesmatal closure was examined in staminal hairs of Setcreasea purpurea by microinjecting cells with active mastoparan (Mas-7), inactive mastoparan (Mas-17), active inositol-1,4,5-trisphosphate (IP3), or inactive IP3. Calcium green dextran 10,000 was used to study cellular free Ca2+, and carboxyfluorescein was used to monitor plasmodesmatal closure. When Mas-7 was microinjected into the cytoplasm of cell 1 (the tip cell of a chain of cells), a rapid increase in calcium green dextran-10,000 fluorescence was observed in the cytoplasmic areas on both sides of the plasmodesmata connecting cells 1 and 2 during the same time that the diffusion of carboxyfluorescein through them was blocked. The inhibition of cell-to-cell diffusion was transient, and the closed plasmodesmata reopened within 30 s. The elevated Ca2+ level near plasmodesmata was also transient and returned to base level in about 1.5 min. The transient increase in Ca2+, once initiated in cell 1, repeated with an oscillatory period of 3 min. Elevated Ca2+ and oscillations of Ca2+ were also observed near interconnecting cell walls throughout the chain of cells, indicating that the signal had been transmitted. Previously, we reported that IP3 closed plasmodesmata; now we report that it stimulated Ca2+ and oscillations similar to Mas-7. The effect was specific for similar concentrations of Mas-7 over Mas-17 and active IP3 over inactive IP3. It is important that the Ca2+ channel blocker La3+ eliminated the responses from Mas-7 and IP3, indicating that an influx of Ca2+ was required. These results support the contention that plasmodesmata functioning is regulated via Ca2+ and that IP3 may be an intermediary between the stimulus and Ca2+ elevations.


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