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PMID: 12237397 Published · ppublish English Journal Article

Inhibition of Pollen Tube Elongation by Microinjected Anti-Rop1Ps Antibodies Suggests a Crucial Role for Rho-Type GTPases in the Control of Tip Growth.

The Plant cell ·Vol. 9 ·No. 9 ·1997-09-00 ·Pages 1647-1659

Lin Y, Yang Z

Abstract

Microinjection of anti-Rop1Ps antibodies was used to assess the function of a tip-localized Rho-type GTPase, Rop, in controlling pollen tube growth. Injected antibodies induced sustained growth arrest within 1 to 2 min after injection but did not affect cytoplasmic streaming. Coinjection with Rop rescued antibody-induced growth inhibition, indicating that injected antibodies specifically block the activity of Rop GTPases. Antibody-induced inhibition was significantly enhanced in the presence of a lower threshold of extracellular [Ca2+] or a subinhibitory dosage of caffeine. In contrast, injection of the C3 toxin, which inactivates a different Rho-type GTPase, arrested tube elongation 10 to 20 min after injection. C3-induced growth arrest was accompanied by the cessation of cytoplasmic streaming. These data suggest that Rho-type GTPases play a pivotal role in the control of pollen tube elongation. We propose that Rop may regulate a Ca2+-dependent pathway involved in vesicle docking/fusion, whereas a C3-sensitive Rho GTPase may mediate cytoplasmic streaming.

Authors & Affiliations
2 authors, click to expand affiliations / ORCID
Lin Y.
Department of Plant Biology and Plant Biotechnology Center, Ohio State University, Columbus, Ohio 43210.
Yang Z.
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Article Info
Journal
The Plant cell
Abbr.
Plant Cell
ISSN
1532-298X
DOI
10.1105/tpc.9.9.1647
Published
1997-09-00
Pages
1647-1659
Language
English
Region
England
NLM ID
9208688
PMCID
PMC157040
External Links
PubMed source DOI: 10.1105/tpc.9.9.1647 PMC Full Text View journal details
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