Plant Allelopathy and Allelochemicals II

A special issue of Plants (ISSN 2223-7747).

Deadline for manuscript submissions: closed (20 October 2023) | Viewed by 4263

Special Issue Editor

Faculty of Agriculture, Kagawa University, Miki, Kagawa 761-0795, Japan
Interests: allelopathy; allelochemical; chemical interaction; mode of action; momilactone; invasive plant; rice allelopathy
Special Issues, Collections and Topics in MDPI journals

Special Issue Information

Dear Colleagues,

Allelopathy is an important phenomenon that is probably involved in all aspects of natural plant ecosystems, such as competition, succession, invention and naturalization. Hundreds of papers related to allelopathy have been published each year in the last decade. Much of the research in allelopathy mentions that it can be used to control weeds and reduce synthetic chemical input into agriculture. There are efforts to generate more allelopathic cultivars of crops by manipulation of the genes involved in the synthesis of allelochemicals. Some of the new information in allelopathy has the potential to be used to understand and control weeds in agriculture.

Some methodologies have greatly contributed to the scientific progress, such as the case of Arabidopsis. This species was used as the test plant to evaluate the biological activity of certain compounds because of its genetic information. Another progressive case in the research of allelopathy was the evaluation of the action modes of active oxygen species. These remarkable examples have stimulated and inspired researchers currently working on allelopathy. Thus, new information and methodologies could be a source of significant findings for researchers in the near future. We are sure to contribute to a better understanding of allelopathy by introducing and discovering exciting and significant examples in this Special Issue.

Dr. Hisashi Kato-Noguchi
Guest Editor

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Keywords

  • allelopathy
  • allelochemical
  • invasive plant
  • mode of action
  • isolation and characterization

Published Papers (4 papers)

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Research

13 pages, 5944 KiB  
Article
Allelopathic Activity of a Novel Compound, Two Known Sesquiterpenes, and a C13 Nor-Isopenoid from the Leave of Croton oblongifolius Roxb. for Weed Control
by Seinn Moh Moh, Shunya Tojo, Toshiaki Teruya and Hisashi Kato-Noguchi
Plants 2023, 12(19), 3384; https://doi.org/10.3390/plants12193384 - 25 Sep 2023
Cited by 1 | Viewed by 757
Abstract
Investigation of allelopathic substances from herbal plants may lead to the development of allelochemical-based natural herbicides. Croton oblongifolius (Roxb.) is a well-known herbal plant with a long history of being used for traditional medicines and for being the source of a diverse range [...] Read more.
Investigation of allelopathic substances from herbal plants may lead to the development of allelochemical-based natural herbicides. Croton oblongifolius (Roxb.) is a well-known herbal plant with a long history of being used for traditional medicines and for being the source of a diverse range of bioactive compounds. This plant has been reported to have allelopathic potential; however, its allelopathic-related substances have not yet been described. Therefore, we conducted this investigation to explore the allelopathic substances from the leaves of C. oblongifolius. Aqueous methanol extracts of C. oblongifolius leaves exhibited significant growth inhibitory potential against four test plants (monocot barnyard grass and timothy, and dicot cress and lettuce). The leaf extracts were purified in various chromatographic steps and yielded four active compounds identified as (3R,6R,7E)-3-hydroxy-4-7-megastigmadien-9-one (I), 2-hydroxy alpinolide (a novel compound) (II), alpinolide (III), and epialpinolide (IV) via an analysis of the spectral data. These identified compounds significantly restricted the seedling growth of cress. The concentration necessary for 50% growth reduction of the cress seedlings varied from 0.15 to 0.24 mM for (3R,6R,7E)-3-hydroxy-4-7-megastigmadien-9-one, 0.04 to 0.11 mM for 2-hydroxy alpinolide, 0.07 to 0.12 mM for alpinolide, and 0.09 to 0.16 mM for epialpinolide. Therefore, the leaf extracts of C. oblongifolius and the characterized compounds have the potential to be used as weed-suppressive resources for natural weed control. Full article
(This article belongs to the Special Issue Plant Allelopathy and Allelochemicals II)
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14 pages, 3584 KiB  
Article
Allelopathic Activity of the Invasive Plant Polygonum chinense Linn. and Its Allelopathic Substances
by Thang Lam Lun, Shunya Tojo, Toshiaki Teruya and Hisashi Kato-Noguchi
Plants 2023, 12(16), 2968; https://doi.org/10.3390/plants12162968 - 17 Aug 2023
Viewed by 761
Abstract
Polygonum chinense Linn., belonging to the Polygonaceae family, is distributed mostly in northern temperate climates. This species is a high-risk invasive plant and is thought to possess allelopathic potential. This study aimed to isolate and identify the allelopathic substances from P. chinense. [...] Read more.
Polygonum chinense Linn., belonging to the Polygonaceae family, is distributed mostly in northern temperate climates. This species is a high-risk invasive plant and is thought to possess allelopathic potential. This study aimed to isolate and identify the allelopathic substances from P. chinense. Aqueous methanol extracts of P. chinense significantly inhibited the growth of alfalfa and Italian ryegrass seedlings in a species- and concentration-dependent manner. Activity-guided fractionation led to the isolation of two active compounds: dehydrovomifoliol and loliolide. A cress bioassay was used to determine the biological activity of dehydrovomifoliol, and cress, alfalfa, and Italian ryegrass were used to determine loliolide. Dehydrovomifoliol significantly suppressed the seedling growth of cress at the concentration of 1 mM, and the concentrations necessary for 50% growth inhibition (I50 values) of the roots and shoots were 1.2 and 2 mM, respectively. Loliolide significantly suppressed the shoot growth of cress, alfalfa, and Italian ryegrass at the concentration of 1 mM, and the concentrations necessary for I50 values of the shoots and roots were 0.15 to 2.33 and 0.33 to 2.23 mM, respectively. The findings of our study suggest the extracts of P. chinense might have growth-inhibitory potential and that dehydrovomifoliol and loliolide might contribute as allelopathic agents. Full article
(This article belongs to the Special Issue Plant Allelopathy and Allelochemicals II)
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14 pages, 2105 KiB  
Article
Allelopathic Potential of Marsdenia tenacissima (Roxb.) Moon against Four Test Plants and the Biological Activity of Its Allelopathic Novel Compound, 8-Dehydroxy-11β-O-Acetyl-12β-O-Tigloyl-17β-Marsdenin
by Seinn Moh Moh, Naoaki Kurisawa, Kiyotake Suenaga and Hisashi Kato-Noguchi
Plants 2023, 12(8), 1663; https://doi.org/10.3390/plants12081663 - 15 Apr 2023
Cited by 3 | Viewed by 964
Abstract
Plant parts and extracts that are rich in bioactive substances with allelopathic potential can be explored as a possible alternative to herbicides for natural weed control in sustainable agriculture. In the present study, we investigated the allelopathic potential of Marsdenia tenacissima leaves and [...] Read more.
Plant parts and extracts that are rich in bioactive substances with allelopathic potential can be explored as a possible alternative to herbicides for natural weed control in sustainable agriculture. In the present study, we investigated the allelopathic potential of Marsdenia tenacissima leaves and its active substances. Aqueous methanol extracts of M. tenacissima showed significant inhibitory activities against the growth of lettuce (Lactuca sativa L.), alfalfa (Medicago sativa L.), timothy (Phleum pratense L.), and barnyard grass (Echinochloa crusgalli (L.) Beauv.). The extracts were purified through various chromatography steps, and one active substance was isolated and determined by spectral data to be a novel compound, assigned as steroidal glycoside 3 (8-dehydroxy-11β-O-acetyl-12β-O-tigloyl-17β-marsdenin). Steroidal glycoside 3 significantly inhibited the seedling growth of cress at a concentration of 0.03 mM. The concentrations needed for 50% growth inhibition of the cress shoots and roots were 0.25 and 0.03 mM, respectively. These results suggest that steroidal glycoside 3 may be responsible for the allelopathy of M. tenacissima leaves. Full article
(This article belongs to the Special Issue Plant Allelopathy and Allelochemicals II)
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12 pages, 1747 KiB  
Article
Isolation and Identification of Plant-Growth Inhibitory Constituents from Polygonum chinense Linn and Evaluation of Their Bioherbicidal Potential
by Thang Lam Lun, Arihiro Iwasaki, Kiyotake Suenaga and Hisashi Kato-Noguchi
Plants 2023, 12(7), 1577; https://doi.org/10.3390/plants12071577 - 06 Apr 2023
Cited by 3 | Viewed by 1325
Abstract
Polygonum chinense Linn. is a medicinal and invasive plant that belongs to the family Polygonaceae. The pharmacological activities and phytochemical constituents of Polygonum chinense are well reported, but the allelopathic effects and potent allelopathic substances of P. chinense remain to be investigated. Hence, [...] Read more.
Polygonum chinense Linn. is a medicinal and invasive plant that belongs to the family Polygonaceae. The pharmacological activities and phytochemical constituents of Polygonum chinense are well reported, but the allelopathic effects and potent allelopathic substances of P. chinense remain to be investigated. Hence, this experiment was conducted to separate and characterize potentially allelopathic substances from an extract of the Polygonum chinense plant. The Polygonum chinense plant extracts highly suppressed the growth of cress (Lepidium sativum L.), lettuce (Lactuca sativa L.), barnyard grass (Echinochloa crusgalli (L.) P. Beauv.), and timothy grass (Phleum pratense L.) seedlings in a species- and concentration-dependent way. Two active substances were separated using a series of purification procedures and determined through spectral analysis as (−)-3-hydroxy-β-ionone and (−)-3-hydroxy-7,8-dihydro-β-ionone. These two compounds significantly suppressed the seedling growth of Lepidium sativum (cress) at concentrations of 0.01 and 1 mM, respectively. The extract concentrations necessary for 50% growth inhibition (I50 values) of the cress hypocotyls and roots were 0.05 and 0.07 mM for (−)-3-hydroxy-β-ionone, respectively, and 0.42 and 1.29 mM for (−)-3-hydroxy-7,8-β-ionone, respectively. These findings suggest that these two compounds are in charge of the inhibitory effects of the Polygonum chinense extract and may serve as weed control agents. Full article
(This article belongs to the Special Issue Plant Allelopathy and Allelochemicals II)
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