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Plants 2015, 4(3), 606-643; doi:10.3390/plants4030606

The Control of Auxin Transport in Parasitic and Symbiotic Root–Microbe Interactions

1
Division of Plant Science, Research School of Biology, Australian National University, Linnaeus Way, Building 134, Canberra ACT 2601, Australia
2
School of BioScience, The University of Melbourne, Parkville VIC 3010, Australia
3
CSIRO Agriculture, Canberra ACT 2601, Australia
*
Author to whom correspondence should be addressed.
Academic Editor: Rujin Chen
Received: 20 July 2015 / Revised: 12 August 2015 / Accepted: 18 August 2015 / Published: 24 August 2015
(This article belongs to the Special Issue Plant Root Development)
View Full-Text   |   Download PDF [4261 KB, uploaded 24 August 2015]   |  

Abstract

Most field-grown plants are surrounded by microbes, especially from the soil. Some of these, including bacteria, fungi and nematodes, specifically manipulate the growth and development of their plant hosts, primarily for the formation of structures housing the microbes in roots. These developmental processes require the correct localization of the phytohormone auxin, which is involved in the control of cell division, cell enlargement, organ development and defense, and is thus a likely target for microbes that infect and invade plants. Some microbes have the ability to directly synthesize auxin. Others produce specific signals that indirectly alter the accumulation of auxin in the plant by altering auxin transport. This review highlights root–microbe interactions in which auxin transport is known to be targeted by symbionts and parasites to manipulate the development of their host root system. We include case studies for parasitic root–nematode interactions, mycorrhizal symbioses as well as nitrogen fixing symbioses in actinorhizal and legume hosts. The mechanisms to achieve auxin transport control that have been studied in model organisms include the induction of plant flavonoids that indirectly alter auxin transport and the direct targeting of auxin transporters by nematode effectors. In most cases, detailed mechanisms of auxin transport control remain unknown. View Full-Text
Keywords: auxin; nodulation; actinorhizal symbiosis; rhizobia; plant parasitic nematodes; mycorrhiza auxin; nodulation; actinorhizal symbiosis; rhizobia; plant parasitic nematodes; mycorrhiza
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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).

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MDPI and ACS Style

Ng, J.L.P.; Perrine-Walker, F.; Wasson, A.P.; Mathesius, U. The Control of Auxin Transport in Parasitic and Symbiotic Root–Microbe Interactions. Plants 2015, 4, 606-643.

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