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Plant Cell, Vol. 11, 1731-1742, September 1999, Copyright © 1999, American Society of Plant Physiologists

Control of Pollen Tube Tip Growth by a Rop GTPase –Dependent Pathway That Leads to Tip-Localized Calcium Influx

Hai Lia, Yakang Lina, Rachel M. Heatha, Michael X. Zhub, and Zhenbiao Yanga
a Department of Plant Biology and Plant Biotechnology Center, Ohio State University, Columbus, Ohio 43210
b Department of Pharmacology and Neurobiotechnology Center, Ohio State University, Columbus, Ohio 43210

Correspondence to: Zhenbiao Yang, zhenbiao.yang{at}ucr.edu (E-mail), 614-292-5379 (fax)

We have shown that Rop1At, a pollen-specific Rop GTPase that is a member of the Rho family of small GTP binding proteins, acts as a key molecular switch controlling tip growth in Arabidopsis pollen tubes. Pollen-specific expression of constitutively active rop1at mutants induced isotropic growth of pollen tubes. Overexpression of wild-type Arabidopsis Rop1At led to ectopic accumulation of Rop1At in the plasma membrane at the tip and caused depolarization of pollen tube growth, which was less severe than that induced by the constitutively active rop1at. These results indicate that both Rop1At signaling and polar localization are critical for controlling the site of tip growth. Dominant negative rop1at mutants or antisense rop1at RNA inhibited tube growth at 0.5 mM extracellular Ca2+, but growth inhibition was reversed by higher extracellular Ca2+. Injection of anti-Rop antibodies disrupted the tip-focused intracellular Ca2+ gradient known to be crucial for tip growth. These studies provide strong evidence for a Rop GTPase–dependent tip growth pathway that couples the control of growth sites with the rate of tip growth through the regulation of tip-localized extracellular Ca2+ influxes and formation of the tip-high intracellular Ca2+ gradient in pollen tubes.




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 Plant Physiol.Home page
P. V. Minorsky

Plant Physiology, September 1, 2001; 127(1): 8 - 9.
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 J Exp BotHome page
L.-M. Fan, Y.-F. Wang, H. Wang, and W.-H. Wu
In vitro Arabidopsis pollen germination and characterization of the inward potassium currents in Arabidopsis pollen grain protoplasts
J. Exp. Bot., August 1, 2001; 52(361): 1603 - 1614.
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 Mol. Biol. CellHome page
L. Vidali, S. T. McKenna, and P. K. Hepler
Actin Polymerization Is Essential for Pollen Tube Growth
Mol. Biol. Cell, August 1, 2001; 12(8): 2534 - 2545.
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 Plant Physiol.Home page
A. Speranza, V. Scoccianti, R. Crinelli, G. L. Calzoni, and M. Magnani
Inhibition of Proteasome Activity Strongly Affects Kiwifruit Pollen Germination. Involvement of the Ubiquitin/Proteasome Pathway as a Major Regulator
Plant Physiology, July 1, 2001; 126(3): 1150 - 1161.
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 Plant Physiol.Home page
H. Li, J.-J. Shen, Z.-L. Zheng, Y. Lin, and Z. Yang
The Rop GTPase Switch Controls Multiple Developmental Processes in Arabidopsis
Plant Physiology, June 1, 2001; 126(2): 670 - 684.
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 Plant CellHome page
Z. Hong, A. J. Delauney, and D. P. S. Verma
A Cell Plate-Specific Callose Synthase and Its Interaction with Phragmoplastin
PLANT CELL, April 1, 2001; 13(4): 755 - 768.
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 Plant CellHome page
Z. Hong, Z. Zhang, J. M. Olson, and D. P. S. Verma
A Novel UDP-Glucose Transferase Is Part of the Callose Synthase Complex and Interacts with Phragmoplastin at the Forming Cell Plate
PLANT CELL, April 1, 2001; 13(4): 769 - 780.
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 JCBHome page
Y. Fu, G. Wu, and Z. Yang
Rop GTPase-dependent Dynamics of Tip-localized F-Actin Controls Tip Growth in Pollen Tubes
J. Cell Biol., March 5, 2001; 152(5): 1019 - 1032.
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 Plant CellHome page
A. A. Sanderfoot, M. Pilgrim, L. Adam, and N. V. Raikhel
Disruption of Individual Members of Arabidopsis Syntaxin Gene Families Indicates Each Has Essential Functions
PLANT CELL, March 1, 2001; 13(3): 659 - 666.
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 Plant Physiol.Home page
Y. Lin, D. F. Seals, S. K. Randall, and Z. Yang
Dynamic Localization of Rop GTPases to the Tonoplast during Vacuole Development
Plant Physiology, January 1, 2001; 125(1): 241 - 251.
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 GeneticsHome page
P. Winge, T. Brembu, R. Kristensen, and A. M. Bones
Genetic Structure and Evolution of RAC-GTPases in Arabidopsis thaliana
Genetics, December 1, 2000; 156(4): 1959 - 1971.
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 Plant Physiol.Home page
G. Wu, H. Li, and Z. Yang
Arabidopsis RopGAPs Are a Novel Family of Rho GTPase-Activating Proteins that Require the Cdc42/Rac-Interactive Binding Motif for Rop-Specific GTPase Stimulation
Plant Physiology, December 1, 2000; 124(4): 1625 - 1636.
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 Am. J. Bot.Home page
E. B. Blancaflor and S. Gilroy
Plant cell biology in the new millennium: new tools and new insights
Am. J. Botany, November 1, 2000; 87(11): 1547 - 1560.
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 Plant Physiol.Home page
J. Park, H.-J. Choi, S. Lee, T. Lee, Z. Yang, and Y. Lee
Rac-Related GTP-Binding Protein in Elicitor-Induced Reactive Oxygen Generation by Suspension-Cultured Soybean Cells
Plant Physiology, October 1, 2000; 124(2): 725 - 732.
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 Plant CellHome page
M. A. Jones, J.-J. Shen, Y. Fu, H. Li, Z. Yang, and C. S. Grierson
The Arabidopsis Rop2 GTPase Is a Positive Regulator of Both Root Hair Initiation and Tip Growth
PLANT CELL, April 1, 2002; 14(4): 763 - 776.
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