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Dissecting Hierarchies between Light, Sugar and Auxin Action Underpinning Root and Root Hair Growth
Open AccessReview

The TOR–Auxin Connection Upstream of Root Hair Growth

1
Laboratory of Hormonal Regulations in Plants, Institute of Experimental Botany, Czech Academy of Sciences, 165 02 Prague, Czech Republic
2
Molecular Systems Biology (MOSYS), Department of Functional and Evolutionary Ecology, University of Vienna, 1010 Vienna, Austria
3
Vienna Metabolomics Center (VIME), University of Vienna, 1010 Vienna, Austria
*
Author to whom correspondence should be addressed.
Plants 2021, 10(1), 150; https://doi.org/10.3390/plants10010150
Received: 13 December 2020 / Revised: 9 January 2021 / Accepted: 11 January 2021 / Published: 13 January 2021
(This article belongs to the Special Issue Advances in Auxin Research)
Plant growth and productivity are orchestrated by a network of signaling cascades involved in balancing responses to perceived environmental changes with resource availability. Vascular plants are divided into the shoot, an aboveground organ where sugar is synthesized, and the underground located root. Continuous growth requires the generation of energy in the form of carbohydrates in the leaves upon photosynthesis and uptake of nutrients and water through root hairs. Root hair outgrowth depends on the overall condition of the plant and its energy level must be high enough to maintain root growth. TARGET OF RAPAMYCIN (TOR)-mediated signaling cascades serve as a hub to evaluate which resources are needed to respond to external stimuli and which are available to maintain proper plant adaptation. Root hair growth further requires appropriate distribution of the phytohormone auxin, which primes root hair cell fate and triggers root hair elongation. Auxin is transported in an active, directed manner by a plasma membrane located carrier. The auxin efflux carrier PIN-FORMED 2 is necessary to transport auxin to root hair cells, followed by subcellular rearrangements involved in root hair outgrowth. This review presents an overview of events upstream and downstream of PIN2 action, which are involved in root hair growth control. View Full-Text
Keywords: TOR signaling; auxin; PIN-FORMED 2; root hair growth; polar cell elongation; ROP2; ROS; root growth; plant adaptation TOR signaling; auxin; PIN-FORMED 2; root hair growth; polar cell elongation; ROP2; ROS; root growth; plant adaptation
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MDPI and ACS Style

Retzer, K.; Weckwerth, W. The TOR–Auxin Connection Upstream of Root Hair Growth. Plants 2021, 10, 150. https://doi.org/10.3390/plants10010150

AMA Style

Retzer K, Weckwerth W. The TOR–Auxin Connection Upstream of Root Hair Growth. Plants. 2021; 10(1):150. https://doi.org/10.3390/plants10010150

Chicago/Turabian Style

Retzer, Katarzyna; Weckwerth, Wolfram. 2021. "The TOR–Auxin Connection Upstream of Root Hair Growth" Plants 10, no. 1: 150. https://doi.org/10.3390/plants10010150

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