Special Issue "Recent Advances in Auxin Research: Synthesis, Transport, Plant Growth and Practical Application"

A special issue of Plants (ISSN 2223-7747). This special issue belongs to the section "Plant Physiology and Metabolism".

Deadline for manuscript submissions: closed (31 October 2023) | Viewed by 922

Special Issue Editors

Department of Chemistry, Mohammed V University in Rabat (UM5R), Rabat 10090, Morocco
Interests: natural products; phytochemistry; synthetic organic chemistry; heterocyclic chemistry; sonochemistry; natural products in sustainable process and medicinal application
Department of Biology, Mohammed V University in Rabat (UM5R), Rabat 10090, Morocco
Interests: plant biotechnology; plant stress physiology; abiotic stress; heavy metals; phytoremediation

Special Issue Information

Dear Colleagues,

Auxin is one of the most important plant hormones and plays a central role in the control of a wide range of physiological and developmental processes in plants. Auxin metabolism and signal transduction are involved in many aspects of plant development and responses of plants to environmental signals. Auxin is involved from the earliest stages of embryogenesis and ensures the growth, organisation and branching of aerial and underground parts. These multiple effects reflect its control of cell division, cell elongation and vascular and floral differentiation. Several studies have also shown that auxin plays essential roles in the response to salt and water stress as well as other biotic and abiotic stresses. In plants, auxin is synthesised at different levels, in particular in meristems, young primordium, vascular tissues and reproductive organs. It then reaches the different parts of the plant through passive and active transport.

Indole 3-acetic acid is the predominant form of auxin in plants. It is present in the form of an indole ring to which an acetic acid chain is added in the 3' position.
This Special Issue deals with the study of natural and synthetic auxin compounds, which are known to have growth-promoting properties. Natural and synthetic auxins are used in agriculture to promote rooting, fruit set, fruit thinning and fruit drop control or as selective herbicides. Understanding the different aspects of auxin metabolism and signalling pathways and its interaction with other signalling mechanisms would lead to a better understanding of plant development mechanisms and their interaction with the environment and to the development of new strategies for crop breeding.

Prof. Dr. Khalid Bougrin
Prof. Dr. Abdelaziz Smouni Smouni
Guest Editors

Manuscript Submission Information

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Please visit the Instructions for Authors page before submitting a manuscript. The Article Processing Charge (APC) for publication in this open access journal is 2700 CHF (Swiss Francs). Submitted papers should be well formatted and use good English. Authors may use MDPI's English editing service prior to publication or during author revisions.


  • auxin
  • auxin biosynthesis
  • synthetic auxins
  • auxin metabolism
  • auxin transport
  • auxin signalling pathway
  • auxin applications

Published Papers (1 paper)

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23 pages, 3580 KiB  
The Knockdown of AUXIN RESPONSE FACTOR 2 Confers Enhanced Tolerance to Salt and Drought Stresses in Tomato (Solanum lycopersicum L.)
Plants 2023, 12(15), 2804; https://doi.org/10.3390/plants12152804 - 28 Jul 2023
Cited by 1 | Viewed by 616
Auxin response factors (ARFs) act as key elements of the auxin-signaling pathway and play important roles in the process of a plant’s growth, development, and response to environmental conditions. We studied the implication of the SlARF2 gene in the tomato response [...] Read more.
Auxin response factors (ARFs) act as key elements of the auxin-signaling pathway and play important roles in the process of a plant’s growth, development, and response to environmental conditions. We studied the implication of the SlARF2 gene in the tomato response to salt (150 mM of NaCl) and drought (15% PEG 20000) stresses. The functional characterization of SlARF2 knockdown tomato mutants revealed that the downregulation of this gene enhanced primary root length and root branching and reduced plant wilting. At the physiological level, the arf2 mutant line displayed higher chlorophyll, soluble sugars, proline, and relative water contents as well as lower stomatal conductance and a decreased malondialdehyde content. Moreover, SlARF2 knockdown tomato mutants demonstrated higher activities of the antioxidant enzymes superoxide dismutase (SOD) and catalase (CAT) under salt and drought stresses than the wild type. Indeed, the stress tolerance of the arf2 mutant was also reflected by the upregulation of stress-related genes involved in ROS scavenging and plant defense, including SOD, CAT, dehydration-responsive element-binding protein, and early responsive to dehydration, which can ultimately result in a better resistance to salt and drought stresses. Furthermore, the transcriptional levels of the Δ1-pyrroline-5-carboxylate synthase (P5CS) gene were upregulated in the arf2 mutant after stress, in correlation with the higher levels of proline. Taken together, our findings reveal that SlARF2 is implicated in salt and drought tolerance in tomato and provides some considerable elements for improving the abiotic stress tolerance and increasing the crop yields of tomato. Full article
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