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Braz J Biol 2021 4;82:e235475. Epub 2021 Jun 4.

Instituto Nacional de Pesquisas da Amazônia - INPA, Laboratório de Bioprospecção e Biotecnologia - LABB, Coordenação de Tecnologia e Inovação - COTEI, Manaus, AM, Brasil.

Plants that produce secondary metabolites with allelopathic activity or phytotoxicity can be biotechnologically important, serving as sources of allelochemicals, and thus contributing to the agroindustrial sector. Vismia japurensis (Hypericaceae) is an Amazonian species that grows in clumps called vismiais, from which most other plants are absent. Accordingly, the objective of this study was to identify possible phytotoxicity effects of hexane and methanol extracts of Vismia japurensis leaves and branches in vivo and from seedlings grown in vitro on Lactuca sativa. Read More

Phytochemistry 2021 Jun 5;189:112826. Epub 2021 Jun 5.

Dipartimento di Scienze Biologiche, Geologiche e Ambientali - Università di Bologna, Via Sant'Alberto 163, 48123, Ravenna, Italy.

Chemical interactions between macroalgae and other organisms play an important role in determining species compositions and dominance patterns, and can explain the widespread success of some species in establishing their predominant populations in a specific coastal area. Allelopathy could act as a self-regulatory strategy of the algal community, being not only a succession regulator but also an active mechanism maintaining the species diversity especially in a delimited environment, such as the benthic ecosystem. Polyunsaturated aldehydes (PUAs) are among the most studied allelopathic compounds and are commonly released into the aquatic environment by different phytoplankton species in response to environmental stressors (e. Read More

Protoplasma 2021 Jun 5. Epub 2021 Jun 5.

Department of Biology, Biotechnical Faculty, University of Ljubljana, Večna pot 111, SI-1000, Ljubljana, Slovenia.

Allelopathic compounds released by invasive alien plants can suppress the growth of plants in their vicinity. The aim of this study was to investigate changes in tissue and cell structure in roots of radish seedlings treated with 10% aqueous extracts of rhizomes from the invasive knotweeds Fallopia japonica and F. ×bohemica. Read More

Int J Mol Sci 2021 May 27;22(11). Epub 2021 May 27.

State Key Laboratory for Biology of Plant Diseases and Insect Pests, Institute of Plant Protection, Chinese Academy of Agricultural Sciences (IPP_CAAS), Beijing 100193, China.

Biodiversity is adversely affected by the growing levels of synthetic chemicals released into the environment due to agricultural activities. This has been the driving force for embracing sustainable agriculture. Plant secondary metabolites offer promising alternatives for protecting plants against microbes, feeding herbivores, and weeds. Read More

Molecules 2021 May 14;26(10). Epub 2021 May 14.

Allelopathy Group, Department of Organic Chemistry, Institute of Biomolecules (INBIO), Campus de Excelencia Internacional (ceiA3), School of Science, University of Cadiz, C/República Saharaui, 7, Puerto Real, 11510 Cadiz, Spain.

Mill., or the custard apple, is one of the species belonging to the Annonaceae family, is widely used in traditional medicine, and has been reported to be a valuable source of bioactive compounds. A unique class of secondary metabolites derived from this family are Annonaceous acetogenins, lipophilic polyketides considered to be amongst the most potent antitumor compounds. Read More

Plants (Basel) 2021 May 14;10(5). Epub 2021 May 14.

Institute of Food Science, University of Debrecen, 138 Böszörményi St., 4032 Debrecen, Hungary.

Woolly cupgrass ( (Thunb.) Kunth) is a new invasive weed in Hungary. This study was conducted to elucidate the effects of this weed on the biochemistry and growth of maize ( L. Read More

Plants (Basel) 2021 May 20;10(5). Epub 2021 May 20.

Department of Agronomy, Faculty of Agriculture, Universitas Padjadjaran Jl. Raya, Bandung Sumedang KM 21 Sumedang, Jawa Barat 45363, Indonesia.

L. (Verbenaceae) is native to tropical America and has been introduced into many other countries as an ornamental and hedge plant. The species has been spreading quickly and has naturalized in more than 60 countries as an invasive noxious weed. Read More

Zhongguo Zhong Yao Za Zhi 2021 May;46(10):2461-2466

National Resource Center for Chinese Materia Medica, China Academy of Chinese Medical Sciences Beijing 100700, China.

Biochar is a kind of solid material with high aromatization and rich in carbon, which is formed by pyrolysis of biomass at high temperature(250-700 ℃) under anoxic or hypoxic conditions. It has the characteristics of large specific surface area and rich pores. In recent years, as a good soil conditioner, biochar has gradually improved its advantages in improving soil rhizosphere micro ecological environment, promoting plant growth and development, and enhancing plant resistance, etc. Read More

Chem Biodivers 2021 May 25. Epub 2021 May 25.

Pharmacognosy Department, Faculty of Pharmacy, Cairo University, Cairo, 12613, Egypt.

Plants belonging to Euphorbia L. genus are considered very interesting from a medicinal point of view due to their diverse metabolites and bioactivities. The essential oil (EO) of Euphorbia mauritanica L. Read More

J Nat Prod 2021 May 25. Epub 2021 May 25.

Key Laboratory of Medicinal Chemistry for Natural Resource, Ministry of Education and Yunnan Province, School of Chemical Science and Technology, Yunnan University, Kunming 650091, China.

Induced water hyacinth with purple roots (PRWH) exerts a significant inhibitory effect on the growth of blue-green algae. Interestingly, its chemical constituents differ from those of wild-type water hyacinth and have not yet been reported. This study aimed to explore the chemical constituents of PRWH and its bioactive components serving as allelopathic agents against blue-green algae. Read More

Sci Total Environ 2021 Jul 21;779:146561. Epub 2021 Mar 21.

Department of Biological Sciences, Luiz de Queiroz College of Agriculture, University of São Paulo, Av. Pádua Dias, 11, São Dimas, 13418-900 Piracicaba, SP, Brazil.

Anthropogenic activities have led to the depletion of the ultraviolet radiation screening ozone layer, exposing aquatic biota to its harmful effects. Also, the rising applications of nanotechnology are resulting in the release and contamination of aquatic ecosystems with engineered nanometals like titanium dioxide nanoparticles (nTiO). The rise in ultraviolet radiation interacts with nanometals, increasing their bioactivities to susceptible aquatic organisms such as algae and cyanobacteria. Read More

Environ Sci Pollut Res Int 2021 May 22. Epub 2021 May 22.

College of Civil and Architectural Engineering, North China University of Science and Technology, Tangshan, 063000, People's Republic of China.

With the increasing eutrophication of the aquatic environments, cyanobacteria blooms caused certain damage to the animals and plants in the aquatic environments. In this experiment, two species were selected from six species of submerged macrophytes, the experimental conditions were changed to achieve the best inhibitory effect on Microcystis aeruginosa, and oxidative damage analysis was carried out. The experiment results demonstrated that the inhibition rate of Vallisneria natans and Ceratophyllum demersum was nearly 100% at the concentration of 3 g/L after 15 days of anaerobic soaking extract. Read More

Plant Cell Environ 2021 May 15. Epub 2021 May 15.

Department of Biological Sciences, Eastern Illinois University, Charleston, Illinois, USA.

Species interactions and mechanisms affect plant coexistence and community assembly. Despite increasing knowledge of kin recognition and allelopathy in regulating inter-specific and intra-specific interactions among plants, little is known about whether kin recognition mediates allelopathic interference. We used allelopathic rice cultivars with the ability for kin recognition grown in kin versus non-kin mixtures to determine their impacts on paddy weeds in field trials and a series of controlled experiments. Read More

Zhongguo Zhong Yao Za Zhi 2021 Apr;46(8):1876-1882

State Key Laboratory Breeding Base of Dao-di Herbs, National Resource Center for Chinese Materia Medica, China Academy of Chinese Medical Sciences Beijing 100700, China.

Weeds is one of the important parts of agricultural ecosystem of Chinese materia medica. Weeds is a double-edged sword with advantages and disadvantages for the cultivated medicinal plants. In this study, we firstly analyzed the positive and negative effects of weeds on the yield and quality of Chinese materia medica. Read More

Harmful Algae 2021 03 18;103:101997. Epub 2021 Feb 18.

Institut de Biologie Physico-Chimique, Laboratory of Chloroplast Biology and Light Sensing in Microalgae, UMR 7141, Centre National de la Recherche Scientifique (CNRS), Sorbonne université, 75005 Paris, France. Electronic address:

Allelopathy is an efficient strategy by which some microalgae can outcompete other species. Allelochemicals from the toxic dinoflagellate Alexandrium minutum have deleterious effects on diatoms, inhibiting metabolism and photosynthesis and therefore give a competitive advantage to the dinoflagellate. The precise mechanisms of allelochemical interactions and the molecular target of allelochemicals remain however unknown. Read More

Environ Monit Assess 2021 May 10;193(6):334. Epub 2021 May 10.

Department of Botany, Panjab University, Chandigarh, 160 014, India.

Calyptocarpus vialis (syn. Synedrella vialis; Asteraceae), a native of the tropical Americas, has acquired an invasive status in the eastern Asia and Africa and, of late, in India. It is an annual herbaceous weed that forms a dominant ground cover due to its prostrate expansion and interferes with the growth of other plant species. Read More

Curr Opin Plant Biol 2021 May 6;62:102045. Epub 2021 May 6.

PHIM Plant Health Institute, Univ Montpellier, INRAE, CIRAD, Institut Agro, IRD, TA A-54 / K Campus International de Baillarguet, 34398, Montpellier Cedex 5, France. Electronic address:

Plant immunity is modulated by several abiotic factors, and microbiome has emerged as a major biotic driver of plant resistance. Recently, a few studies showed that plants also modify resistance to pests and pathogens in their neighborhood. Several types of neighborhood could be identified depending on the biological processes at play: intraspecific and interspecific competition, kin and stranger recognition, plant-soil feedbacks, and danger signaling. Read More

J Agric Food Chem 2021 May 7;69(19):5500-5509. Epub 2021 May 7.

Agrotechnology and Rural Development Division, CSIR-North East Institute of Science and Technology (NEIST), Jorhat, Assam 785006, India.

Plai or cassumunar ginger (), mainly distributed in tropical Asia, is an essential oil-bearing rhizomatous crop belonging to the Zingiberaceae family. Rhizomes and essential oil of this herb are used in culinary as flavoring agents, traditional medicines, and aromatherapy. In this study, the effect of different postharvest drying methods (air-, oven-drying at 40 and 60 °C, sun-, microwave-, and freeze-drying) of its sliced rhizome on the essential oil yield, composition, and sensory quality was investigated. Read More

Sci Total Environ 2021 Jun 6;773:145681. Epub 2021 Feb 6.

Division of Marine Ecosystems Functioning, Institute of Oceanography, University of Gdańsk, Av. Piłsudskiego 46, 81-378 Gdynia, Poland.

Allelopathy is widespread in marine, brackish, and freshwater habitats. Literature data indicate that allelopathy could offer a competitive advantage for some phytoplankton species by reducing the growth of competitors. It is also believed that allelopathy may affect species succession. Read More

Plants (Basel) 2021 Apr 11;10(4). Epub 2021 Apr 11.

Department of Chemical Sciences, University of Naples Federico II, Complesso Universitario Monte S. Angelo, Via Cintia, 80126 Naples, Italy.

The holoparasitic broomrape weeds ( and species) cause severe yield losses throughout North Africa, the Middle East, and Southern and Eastern Europe. These parasitic weeds form an haustorium at the tip of their radicles to infect the crop upon detection of the host-derived haustorium-inducing factors. Until now, the haustorial induction in the broomrapes remains less studied than in other parasitic plant species. Read More

New Phytol 2021 07 13;231(1):85-93. Epub 2021 May 13.

State Key Laboratory of Crop Gene Exploration and Utilization in Southwest China, Chengdu, Sichuan, 611130, China.

Diterpenoids play important roles in rice microbial disease resistance as phytoalexins, as well as acting in allelopathy and abiotic stress responses. Recently, the casbane-type phytoalexin ent-10-oxodepressin was identified in rice, but its biosynthesis has not yet been elucidated. Here ent-10-oxodepressin biosynthesis was investigated via co-expression analysis and biochemical characterisation, with use of the CRISPR/Cas9 technology for genetic analysis. Read More

Environ Sci Pollut Res Int 2021 Apr 20. Epub 2021 Apr 20.

Department of Marine Ecology, College of Marine Life Sciences, Ocean University of China, No. 5 Yu Shan Road, Qingdao, Shandong, People's Republic of China, 266003.

Green tides have been increasing in frequency and severity in coastal areas in recent years, and thus, the adverse effects of green tides on the environment have attracted much research attention. Allelopathy is one of the most significant effects of green tide algae on the surrounding organisms. In this study, a series of experiments were developed to fully investigate the allelopathic effects of the green tide alga Ulva linza on two common coastal phytoplankton species and to isolate and identify the chemical compositions of the allelochemicals. Read More

Environ Sci Pollut Res Int 2021 Apr 16. Epub 2021 Apr 16.

Cyanobacteria Management Office, Wuxi, 214071, China.

To investigate the effects of an allelochemical artemisinin extracted from Artemisia annua (A. annua) on cell growth, death mode, and microcystin-LR (MC-LR) changes of Microcystis aeruginosa (M. aeruginosa), a series of morphological and biochemical characteristics were studied. Read More

Am J Bot 2021 04 16;108(4):607-615. Epub 2021 Apr 16.

Biological Sciences Department, California Polytechnic State University, 1 Grand Avenue, San Luis Obispo, California, 93407, USA.

Premise: Sparse understory communities, in association with non-native tree species, are often attributed to allelopathy, the chemical inhibition of a plant by another. However, allelopathy is a difficult ecological phenomenon to demonstrate as many studies show conflicting results. Eucalyptus globulus, a tree native to Australia, is one of the most widely planted trees around the world. Read More

Physiol Mol Biol Plants 2021 Mar 4;27(3):483-495. Epub 2021 Mar 4.

Institute of Environment and Ecology & School of the Environment and Safety Engineering, Jiangsu University, Zhenjiang, 212013 China.

The effect of allelopathy from invasive alien plants (IAPs) on native species is one of the main factors for their adaptation and diffusion. IAPs can have different degrees of invasion under natural succession and are distributed in numerous regions. Seed germination and seedling growth (SGe-SGr) play a crucial role in population recruitment. Read More

An Acad Bras Cienc 2021 9;93(1):e20200129. Epub 2021 Apr 9.

Universidade Federal do Paraná, Departamento de Química, Av. Cel. Francisco H. dos Santos, 100, Jardim das Américas, 81530-900 Curitiba, PR, Brazil.

Eragrostis plana (Nees) (Tough Lovegrass) shows ability to interfere with other plants, a phenomenon known as allelopathy. This chemical interaction between plants occurs due to the release of compounds into the environment. Thus, a phytotoxicity study was carried out with E. Read More

Environ Technol 2021 May 2:1-10. Epub 2021 May 2.

College of Landscape Architecture, Nanjing Forestry University, Nanjing, People's Republic of China.

The cell membrane permeability, morphology, metabolomics, and gene expression of under various concentrations of succinic acid (SA) were evaluated to clarify the mechanism of SA inhibition of . The results showed that SA caused intracellular protein and nucleic acid extravasation by increasing the cell membrane permeability. Scanning electron microscopy suggested that a high dose of SA (60 mg L) could damage the cell membrane and even cause lysis in some cells. Read More

Plants (Basel) 2021 Mar 5;10(3). Epub 2021 Mar 5.

State Key Laboratory of Desert and Oasis Ecology, Xinjiang Institute of Ecology and Geography, Chinese Academy of Sciences, Urumqi 830011, China.

The chemical profile and allelopathic effect of the volatile organic compounds (VOCs) produced by a dominant shrub (Krasch.) Poljak. growing in northwestern China was investigated for the first time. Read More

Sci Rep 2021 Mar 29;11(1):7068. Epub 2021 Mar 29.

School of Resources and Environment, Anhui Agricultural University, Hefei, 230036, China.

Although it is well-documented that invasion of invasive plants is promoted with allelopathic effects by inhibiting the growth and phenotypic performance of native plants, little is known conversely. In this study, the allelopathy effects of a native plant, Humulus scandens (Lour.) Merr. Read More

Sci Total Environ 2021 Aug 17;780:146484. Epub 2021 Mar 17.

CAS Key Laboratory of Marine Ecology and Environmental Sciences, Institute of Oceanology, Chinese Academy of Sciences, Qingdao 266071, China; Laboratory for Marine Ecology and Environmental Science, Qingdao National Laboratory for Marine Science and Technology, Qingdao 266237, China; Center for Ocean Mega-Science, Chinese Academy of Sciences, Qingdao 266071, China. Electronic address:

The dinoflagellate genus Alexandrium has been well known for causing paralytic shellfish poisoning (PSP) worldwide. Several non-PSP toxin-producing species, however, have shown to exhibit fish-killing toxicity. Here, we report the allelopathic activity of Alexandrium leei from Malaysia to other algal species, and its toxicity to finfish and zooplankton, via laboratory bioassays. Read More