Advances in Auxin Research Ⅱ

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

Deadline for manuscript submissions: closed (15 January 2022) | Viewed by 11644

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Guest Editor
CEITEC—Central European Institute of Technology, Masaryk University, Kamenice 5, Brno, 625 00, Brno, Czech Republic
Interests: plant development; seed development; auxin production; abiotic stress
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Special Issue Information

Dear Colleagues,

Phytohormones are endogenous molecules occurring naturally in plants at minute concentrations. They act as signalling compounds that promote and influence plant development and physiology. Auxin has been identified as a plant growth hormone for its ability to stimulate differential growth in response to gravity or light cues. It is involved in a wide variety of biological mechanisms. It includes basic cellular processes (endocytosis, cell polarity, and cell cycle control) for localized responses (cell elongation and differential growth). Therefore, auxin regulates macroscopic phenomena (embryogenesis, tissue patterning, and de novo formation of organs).

The effect of auxin on plant growth and development depends primarily on its amount and distribution in organs and tissues. This regulation is implemented on at least four functional levels: hormone biosynthesis; its metabolism, especially the formation and hydrolysis of conjugates; its active or passive transport; and the perception and processing of auxin signalling by nuclear protein receptors.

The cellular and tissular sensitivities to the auxin signals, as well as the extraordinary self-organizing and self-regulating properties of auxin biology, are further translated to the plant phenotypes and give important impulses for flexible plant development.

Even though the history of auxin research reaches back more than a hundred years, we are still far from having a comprehensive understanding of how auxin governs a wide range of plant responses. Therefore, with this Special Issue we want to give you the opportunity to contribute research articles or reviews concerning any of the auxin-related aspects mentioned above.

Dr. Helene Robert Boisivon
Guest Editor

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Keywords

  • auxin metabolism
  • auxin signalling
  • polar auxin transport
  • auxin biosynthesis

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Published Papers (2 papers)

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13 pages, 3532 KiB  
Article
Throttling Growth Speed: Evaluation of aux1-7 Root Growth Profile by Combining D-Root system and Root Penetration Assay
by Judith García-González, Jozef Lacek, Wolfram Weckwerth and Katarzyna Retzer
Plants 2022, 11(5), 650; https://doi.org/10.3390/plants11050650 - 27 Feb 2022
Cited by 4 | Viewed by 2443
Abstract
Directional root growth control is crucial for plant fitness. The degree of root growth deviation depends on several factors, whereby exogenous growth conditions have a profound impact. The perception of mechanical impedance by wild-type roots results in the modulation of root growth traits, [...] Read more.
Directional root growth control is crucial for plant fitness. The degree of root growth deviation depends on several factors, whereby exogenous growth conditions have a profound impact. The perception of mechanical impedance by wild-type roots results in the modulation of root growth traits, and it is known that gravitropic stimulus influences distinct root movement patterns in concert with mechanoadaptation. Mutants with reduced shootward auxin transport are described as being numb towards mechanostimulus and gravistimulus, whereby different growth conditions on agar-supplemented medium have a profound effect on how much directional root growth and root movement patterns differ between wild types and mutants. To reduce the impact of unilateral mechanostimulus on roots grown along agar-supplemented medium, we compared the root movement of Col-0 and auxin resistant 1-7 in a root penetration assay to test how both lines adjust the growth patterns of evenly mechanostimulated roots. We combined the assay with the D-root system to reduce light-induced growth deviation. Moreover, the impact of sucrose supplementation in the growth medium was investigated because exogenous sugar enhances root growth deviation in the vertical direction. Overall, we observed a more regular growth pattern for Col-0 but evaluated a higher level of skewing of aux1-7 compared to the wild type than known from published data. Finally, the tracking of the growth rate of the gravistimulated roots revealed that Col-0 has a throttling elongation rate during the bending process, but aux1-7 does not. Full article
(This article belongs to the Special Issue Advances in Auxin Research Ⅱ)
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Review

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14 pages, 1232 KiB  
Review
Auxin and Cytokinin Interplay during Leaf Morphogenesis and Phyllotaxy
by Sajid Hussain, Satyabrata Nanda, Junhua Zhang, Muhammad Ishaq Asif Rehmani, Muhammad Suleman, Gaojie Li and Hongwei Hou
Plants 2021, 10(8), 1732; https://doi.org/10.3390/plants10081732 - 21 Aug 2021
Cited by 30 | Viewed by 8590
Abstract
Auxins (IAA) and cytokinins (CKs) are the most influential phytohormones, having multifaceted roles in plants. They are key regulators of plant growth and developmental processes. Additionally, their interplay exerts tight control on plant development and differentiation. Although several reviews have been published detailing [...] Read more.
Auxins (IAA) and cytokinins (CKs) are the most influential phytohormones, having multifaceted roles in plants. They are key regulators of plant growth and developmental processes. Additionally, their interplay exerts tight control on plant development and differentiation. Although several reviews have been published detailing the auxin-cytokinin interplay in controlling root growth and differentiation, their roles in the shoot, particularly in leaf morphogenesis are largely unexplored. Recent reports have provided new insights on the roles of these two hormones and their interplay on leaf growth and development. In this review, we focus on the effect of auxins, CKs, and their interactions in regulating leaf morphogenesis. Additionally, the regulatory effects of the auxins and CKs interplay on the phyllotaxy of plants are discussed. Full article
(This article belongs to the Special Issue Advances in Auxin Research Ⅱ)
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