Next Article in Journal
Transcriptomic Analysis Identifies New Non-Target Site Glyphosate-Resistance Genes in Conyza bonariensis
Next Article in Special Issue
Pollination Type Recognition from a Distance by the Ovary Is Revealed Through a Global Transcriptomic Analysis
Previous Article in Journal
Involvement of Phenolic Acids in Short-Term Adaptation to Salinity Stress is Species-Specific among Brassicaceae
Previous Article in Special Issue
Embryology in Helosis cayennensis (Balanophoraceae): Structure of Female Flowers, Fruit, Endosperm and Embryo
Article Menu
Issue 6 (June) cover image

Export Article

Open AccessReview

Signaling in Pollen Tube Growth: Beyond the Tip of the Polarity Iceberg

School of Biological Sciences, Washington State University, Pullman, WA 99164-4236, USA
Center for Reproductive Biology, Pullman, WA, 99164, USA
Author to whom correspondence should be addressed.
Plants 2019, 8(6), 156;
Received: 30 April 2019 / Revised: 4 June 2019 / Accepted: 6 June 2019 / Published: 7 June 2019
(This article belongs to the Special Issue Plant Reproduction)
PDF [1144 KB, uploaded 7 June 2019]


The coordinated growth of pollen tubes through floral tissues to deliver the sperm cells to the egg and facilitate fertilization is a highly regulated process critical to the Angiosperm life cycle. Studies suggest that the concerted action of a variety of signaling pathways underlies the rapid polarized tip growth exhibited by pollen tubes. Ca2+ and small GTPase-mediated pathways have emerged as major players in the regulation of pollen tube growth. Evidence suggests that these two signaling pathways not only integrate with one another but also with a variety of other important signaling events. As we continue to elucidate the mechanisms involved in pollen tube growth, there is a growing importance in taking a holistic approach to studying these pathways in order to truly understand how tip growth in pollen tubes is orchestrated and maintained. This review considers our current state of knowledge of Ca2+-mediated and GTPase signaling pathways in pollen tubes, how they may intersect with one another, and other signaling pathways involved. There will be a particular focus on recent reports that have extended our understanding in these areas. View Full-Text
Keywords: pollen tube tip growth; polarity; Ca2+ signaling; ROP GTPase pollen tube tip growth; polarity; Ca2+ signaling; ROP GTPase

Figure 1

This is an open access article distributed under the Creative Commons Attribution License which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited (CC BY 4.0).

Share & Cite This Article

MDPI and ACS Style

Scheible, N.; McCubbin, A. Signaling in Pollen Tube Growth: Beyond the Tip of the Polarity Iceberg. Plants 2019, 8, 156.

Show more citation formats Show less citations formats

Note that from the first issue of 2016, MDPI journals use article numbers instead of page numbers. See further details here.

Related Articles

Article Metrics

Article Access Statistics



[Return to top]
Plants EISSN 2223-7747 Published by MDPI AG, Basel, Switzerland RSS E-Mail Table of Contents Alert
Back to Top