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Plants
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Plant–Plant Allelopathic Interactions—The Second Edition
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Plant–Plant Allelopathic Interactions—The Second Edition

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

Deadline for manuscript submissions: closed (20 February 2023) | Viewed by 5824

Special Issue Editors

Dr. Bousquet-Mélou Anne

E-Mail Website
Guest Editor
Mediterranean Institute of Biodiversity and Ecology, Aix-Marseille University, 13003 Marseille, France
Interests: plant-plant interactions; allelopathy; ecosystem functionning; forest ecosystems; chemical ecology; mangroves
Special Issues, Collections and Topics in MDPI journals
Dr. James M. Mwendwa

E-Mail Website
Guest Editor
Graham Centre for Agricultural Innovation, Charles Sturt University, Albert Pugsley Place, Wagga Wagga, NSW 2650, Australia
Interests: agronomy; crop and weed allelopathy; allelochemicals; metabolomics; crop and weed competition; soil carbon
Special Issues, Collections and Topics in MDPI journals
Dr. Sajid Latif

E-Mail Website
Guest Editor
Graham Centre of Agricultural Innovation, Charles Sturt University, Bathurst, NSW, Australia
Interests: metabolomics; plant interactions; allelopathy; field research; bioinformatics
Special Issues, Collections and Topics in MDPI journals

Special Issue Information

Dear Colleagues,

The ability of certain plant species to affect other plants has been well documented since antiquity. The first writings on this subject are attributed to Theophrastus (300 BC), a student of Aristotle who noticed the harmful effects of cabbage on a vine crop and suggested that such effects were caused by "smells" from cabbage plants. This phenomenon of interference among neighboring plants is known as allelopathy and typically includes the study of interactions between plants or plants and microbes, as well as the effects of compounds or allelochemicals released by plants on plant growth or other soil factors, and can be studied at different scales within plant communities.

Allelopathic interference is typically mediated by the release of plant or microbially produced secondary metabolites into the environment via volatilization, leaching through rainfall, root exudation or the decomposition of plant litter. A single compound or a mixture of metabolites may prove to be active, but the phenomenon of allelopathy is dependent on the accumulated concentration of bioactive compounds and their persistence over time in the natural environment. Therefore, the study of the ecology of such interactions, as well as the physiology and chemistry of allelochemical interference, is critical to the field of allelopathy. To date, the involvement of allelopathic mechanisms in vegetation dynamics and the spatial distribution of plants has been explored on a limited basis, both in natural ecosystems and agrosystems. In addition to the fundamental aspects of research on plant interference and relationships between plant species, the field of allelopathy also includes applied aspects of plant ecology, including, but not limited to, weed and crop ecology and invasive weed management. Aspects of phytoremediation and bioremediation may also be presented in this Special Issue, as well as the development of novel bioherbicides or competitive crops through allelopathy.

Dr. Bousquet-Mélou Anne
Dr. James M Mwendwa
Dr. Sajid Latif
Guest Editors

Manuscript Submission Information

Manuscripts should be submitted online at www.mdpi.com by registering and logging in to this website. Once you are registered, click here to go to the submission form. Manuscripts can be submitted until the deadline. All submissions that pass pre-check are peer-reviewed. Accepted papers will be published continuously in the journal (as soon as accepted) and will be listed together on the special issue website. Research articles, review articles as well as short communications are invited. For planned papers, a title and short abstract (about 100 words) can be sent to the Editorial Office for announcement on this website.

Submitted manuscripts should not have been published previously, nor be under consideration for publication elsewhere (except conference proceedings papers). All manuscripts are thoroughly refereed through a single-blind peer-review process. A guide for authors and other relevant information for submission of manuscripts is available on the Instructions for Authors page. Plants is an international peer-reviewed open access semimonthly journal published by MDPI.

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.

Keywords

  • allelopathy
  • allelochemicals
  • vegetation dynamics
  • terrestrial invasion
  • crop and weed allelopathy
  • competitive crops
  • bioherbicides

Published Papers (3 papers)

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Research

12 pages, 2146 KiB  
Article
Soil Effects on the Bioactivity of Hydroxycoumarins as Plant Allelochemicals
by Gracia Facenda, Miguel Real, Jose A. Galán-Pérez, Beatriz Gámiz and Rafael Celis
Plants 2023, 12(6), 1278; https://doi.org/10.3390/plants12061278 - 10 Mar 2023
Cited by 4 | Viewed by 1176
Abstract
Soil plays a primary role in the activity of plant allelochemicals in natural and agricultural systems. In this work, we compared the phytotoxicity of three natural hydroxycoumarins (umbelliferone, esculetin, and scopoletin) to different model plant species (Lactuca sativa, Eruca sativa, [...] Read more.
Soil plays a primary role in the activity of plant allelochemicals in natural and agricultural systems. In this work, we compared the phytotoxicity of three natural hydroxycoumarins (umbelliferone, esculetin, and scopoletin) to different model plant species (Lactuca sativa, Eruca sativa, and Hordeum vulgare) in Petri dishes, and then selected the most phytotoxic compound (umbelliferone) to assess how its adsorption and dissipation in two distinct soils affected the expression of its phytotoxic activity. The root growth inhibitory effect of umbelliferone was significantly greater than that of esculetin and scopoletin, and the dicot species (L. sativa and E. sativa) were more sensitive to the hydroxycoumarins than the monocot species (H. vulgare). For all three plant species tested, the phytotoxicity of umbelliferone decreased in the following order: soilless (Petri dishes) > soil 1 > soil 2. In soil 2 (alkaline), umbelliferone displayed negligible adsorption (Kf < 0.01) and rapid biodegradation (t1/2 = 0.2–0.8 days), and its phytotoxicity was barely expressed. In soil 1 (acid), umbelliferone displayed enhanced adsorption (Kf = 2.94), slower biodegradation (t1/2 = 1.5–2.1 days), and its phytotoxicity was better expressed than in soil 2. When the microbial activity of soil 2 was suppressed by autoclaving, the phytotoxicity of umbelliferone, in the presence of soil, became similar to that observed under soilless conditions. The results illustrate how soil processes can reduce the allelopathic activity of hydroxycoumarins in natural and agricultural ecosystems, and suggest scenarios where the bioactivity of hydroxycoumarins may be better expressed. Full article
(This article belongs to the Special Issue Plant–Plant Allelopathic Interactions—The Second Edition)
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15 pages, 2574 KiB  
Article
Effects of Coumarin on Rhizosphere Microbiome and Metabolome of Lolium multiflorum
by Yihu Yang, Jun Xu, Yan Li, Yuchen He, Yuqing Yang, Dalin Liu and Caixia Wu
Plants 2023, 12(5), 1096; https://doi.org/10.3390/plants12051096 - 1 Mar 2023
Cited by 4 | Viewed by 1569
Abstract
Rhizosphere microorganisms can help plants absorb nutrients, coordinate their growth, and improve their environmental adaptability. Coumarin can act as a signaling molecule that regulates the interaction between commensals, pathogens, and plants. In this study, we elucidate the effect of coumarin on plant root [...] Read more.
Rhizosphere microorganisms can help plants absorb nutrients, coordinate their growth, and improve their environmental adaptability. Coumarin can act as a signaling molecule that regulates the interaction between commensals, pathogens, and plants. In this study, we elucidate the effect of coumarin on plant root microorganisms. To provide a theoretical basis for the development of coumarin-derived compounds as biological pesticides, we determined the effect of coumarin on the root secondary metabolism and rhizosphere microbial community of annual ryegrass (Lolium multiflorum Lam.). We observed that a 200 mg/kg coumarin treatment had a negligible effect on the rhizosphere soil bacterial species of the annual ryegrass rhizosphere, though it exhibited a significant effect on the abundance of bacteria in the rhizospheric microbial community. Under coumarin-induced allelopathic stress, annual ryegrass can stimulate the colonization of beneficial flora in the root rhizosphere; however, certain pathogenic bacteria, such as Aquicella species, also multiply in large numbers in such conditions, which may be one of the main reasons for a sharp decline in the annual ryegrass biomass production. Further, metabolomics analysis revealed that the 200 mg/kg coumarin treatment triggered the accumulation of a total of 351 metabolites, of which 284 were found to be significantly upregulated, while 67 metabolites were significantly downregulated in the T200 group (treated with 200 mg/kg coumarin) compared to the CK group (control group) (p < 0.05). Further, the differentially expressed metabolites were primarily associated with 20 metabolic pathways, including phenylpropanoid biosynthesis, flavonoid biosynthesis, glutathione metabolism, etc. We found significant alterations in the phenylpropanoid biosynthesis and purine metabolism pathways (p < 0.05). In addition, there were significant differences between the rhizosphere soil bacterial community and root metabolites. Furthermore, changes in the bacterial abundance disrupted the balance of the rhizosphere micro-ecosystem and indirectly regulated the level of root metabolites. The current study paves the way towards comprehensively understanding the specific relationship between the root metabolite levels and the abundance of the rhizosphere microbial community. Full article
(This article belongs to the Special Issue Plant–Plant Allelopathic Interactions—The Second Edition)
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22 pages, 2855 KiB  
Article
The First Evidence of Gibberellic Acid’s Ability to Modulate Target Species’ Sensitivity to Honeysuckle (Lonicera maackii) Allelochemicals
by Csengele Éva Barta, Brian Colby Jenkins, Devon Shay Lindstrom, Alyka Kay Zahnd and Gyöngyi Székely
Plants 2023, 12(5), 1014; https://doi.org/10.3390/plants12051014 - 23 Feb 2023
Viewed by 2657
Abstract
Invasive species employ competitive strategies such as releasing allelopathic chemicals into the environment that negatively impact native species. Decomposing Amur honeysuckle (Lonicera maackii) leaves leach various allelopathic phenolics into the soil, decreasing the vigor of several native species. Notable differences in [...] Read more.
Invasive species employ competitive strategies such as releasing allelopathic chemicals into the environment that negatively impact native species. Decomposing Amur honeysuckle (Lonicera maackii) leaves leach various allelopathic phenolics into the soil, decreasing the vigor of several native species. Notable differences in the net negative impacts of L. maackii metabolites on target species were argued to depend on soil properties, the microbiome, the proximity to the allelochemical source, the allelochemical concentration, or environmental conditions. This study is the first to address the role of target species’ metabolic properties in determining their net sensitivity to allelopathic inhibition by L. maackii. Gibberellic acid (GA3) is a critical regulator of seed germination and early development. We hypothesized that GA3 levels might affect the target sensitivity to allelopathic inhibitors and evaluated differences in the response of a standard (control, Rbr), a GA3-overproducing (ein), and a GA3-deficient (ros) Brassica rapa variety to L. maackii allelochemicals. Our results demonstrate that high GA3 concentrations substantially alleviate the inhibitory effects of L. maackii allelochemicals. A better understanding of the importance of target species’ metabolic properties in their responses to allelochemicals will contribute to developing novel invasive species control and biodiversity conservation protocols and may contribute to applications in agriculture. Full article
(This article belongs to the Special Issue Plant–Plant Allelopathic Interactions—The Second Edition)
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