Next Article in Journal
Telomerase Inhibition by a New Synthetic Derivative of the Aporphine Alkaloid Boldine
Previous Article in Journal
Calcium and Nuclear Signaling in Prostate Cancer
Previous Article in Special Issue
The Role of Auxin in Cell Wall Expansion
Open AccessArticle

PIN7 Auxin Carrier Has a Preferential Role in Terminating Radial Root Expansion in Arabidopsis thaliana

Department of Applied Genetics and Cell Biology, University of Natural Resources and Life Sciences (BOKU), Vienna 1190, Austria
*
Author to whom correspondence should be addressed.
Current address: Department of Plant Sciences, University of California, Davis, CA 95616, USA.
Int. J. Mol. Sci. 2018, 19(4), 1238; https://doi.org/10.3390/ijms19041238
Received: 25 January 2018 / Revised: 6 April 2018 / Accepted: 13 April 2018 / Published: 19 April 2018
(This article belongs to the Special Issue Auxin)
Directional growth of lateral roots is critical for radial expansion and soil coverage. Despite its importance, almost nothing is known about its molecular determinants. Initially, young lateral roots (LRs) grow away from the parental root, maintaining the angle acquired shortly after emergence. A second downwards bending response to gravity terminates the so-called plateau phase and thereby limits radial root expansion. Here, we show that the exit from the plateau phase correlates with an increase in auxin signalling at the tip of the LRs. Moreover, the increase in auxin levels induces the termination of the plateau phase, which requires PIN-FORMED (PIN) auxin efflux carriers. Our data suggests that the developmental increase in auxin triggers the preferential derepression of PIN7 in gravity-sensing columella cells. The subsequent polarization of PIN7 heralds the bending towards gravity and, hence, the exit from the plateau phase. This developmental framework reveals the distinct roles of PIN auxin efflux carriers in controlling the radial growth of root systems. View Full-Text
Keywords: lateral root; gravitropism; auxin; PIN4; PIN3; PIN7; gravitropic set point angle; GSA; root system architecture lateral root; gravitropism; auxin; PIN4; PIN3; PIN7; gravitropic set point angle; GSA; root system architecture
Show Figures

Graphical abstract

MDPI and ACS Style

Ruiz Rosquete, M.; Waidmann, S.; Kleine-Vehn, J. PIN7 Auxin Carrier Has a Preferential Role in Terminating Radial Root Expansion in Arabidopsis thaliana. Int. J. Mol. Sci. 2018, 19, 1238.

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.

Article Access Map by Country/Region

1
Search more from Scilit
 
Search
Back to TopTop