scholarly journals The allelopathic effect of Taraxacum officinale F.G. Wigg on the seeds germination and initial growth of Lolium westerwoldicum R.Br.

2012 ◽  
Vol 62 (2) ◽  
pp. 207-212 ◽  
Author(s):  
Jolanta Jankowska ◽  
Grażyna A. Ciepiela ◽  
Jacek Sosnowski ◽  
Roman Kolczarek ◽  
Kazimierz Jankowski
Keyword(s):  
Plant Extracts ◽  
Taraxacum Officinale ◽  
Inhibitory Effect ◽  
Leaf Sheath ◽  
Allelopathic Effect ◽  
Initial Growth ◽  
Soil Extracts ◽  
Leaves And Roots ◽  
Common Dandelion ◽  
Seeds Germination

The common dandelion (<i>Taraxacum officinale</i> F.H. Wigg) is a perennial plant often found in large concentrations in the sward of natural meadows. This species expands quickly, displacing other species. In literature there is a lack of data relating to the effect of common dandelion on plants growing in its vicinity. It is also not known why this species creates large clusters. Perhaps it competes with different plants through the allelopathic effect. Hence, the aim of this study was to determine the influence of water extracts from leaves and roots of common dandelion (<i>Taraxacum officinale</i>) as well as soil extracts from the root layer of this species on seed germination and the initial growth of <i>Lolium westerwoldicum</i> R.Br. The investigated material comprised leaves and roots of <i>Taraxacum officinale</i>. The germination biotest most often used in experiments was applied. The seeds germination energy of westerwolds ryegrass was most inhibited by plant extracts prepared from roots and leaves of <i>Taraxacum officinale</i>. The germination ability of seeds of <i>Lolium westerwoldicum</i> was the highest in the treatments in which soil extracts were applied; however, the value of this feature was limited to a larger extent by the plant extracts from leaves of <i>Taraxacum officinale</i> than from roots. Higher concentrations of both soil and plant solutions had an inhibitory effect both on root growth and the growth of the leaf sheath and leaves of westerwolds ryegrass. The results of the tested parameters can confirm the allelopathic effect of <i>Taraxacum officinale</i> on germination and initial growth of <i>Lolium westerwoldicum</i>, and especially that of extracts prepared from leaves.

scholarly journals Allelopathic effect of Pinus roxburghii on an understorey plant, Bidens pilosa

2016 ◽  
Vol 5 (10) ◽  
pp. 1446 ◽  
Author(s):  
Neel Kant Sharma* ◽  
Daizy R. Batish ◽  
Harminder Pal Singh ◽  
R. K. Kohli
Keyword(s):  
Inhibitory Effect ◽  
Shoot Length ◽  
Allelopathic Effect ◽  
Initial Growth ◽  
Aqueous Extracts ◽  
Bidens Pilosa ◽  
Pinus Roxburghii ◽  
Needle Litter ◽  
Laboratory Bioassays ◽  
Understorey Plant

Allelopathic effect of Pinus roxburghii was studied on Bidens pilosa through laboratory and greenhouse experiments. The aqueous extracts of green needles, needle litter and bark were found to inhibit germination and initial growth of B. pilosa in laboratory bioassays. The inhibitory effect on germination root length, shoot length and biomass was also observed on amendment of powdered needle litter in soil in greenhouse pots. The inhibitory effect increased with increase in conc. of extracts or amount of litter amended. The amended soil was found to be rich in phenolics, the known potent allelochemics. The study indicates that such interactions may also be operational in forests of P. roxburghii.

scholarly journals Allelopathic Potential of Sorghum bicolor at Different Phenological Stages

2019 ◽  
Vol 37 ◽  
Author(s):  
V. ZUCARELI ◽  
E.M.P. COELHO ◽  
W.V. FERNANDES ◽  
E.M. PERES ◽  
J. STRACIERI
Keyword(s):  
Sorghum Bicolor ◽  
Aqueous Extract ◽  
Dry Matter ◽  
Germination Rate ◽  
Inhibitory Effect ◽  
Allelopathic Effect ◽  
Initial Growth ◽  
Bioindicator Species ◽  
Phenological Stages ◽  
Allelopathic Potential

ABSTRACT: This study aimed to assess the allelopathic potential of the aqueous extract of the shoot of Sorghum bicolor at different phenological stages on seed germination and initial growth of kale (Brassica oleracea var. acephala) seedlings, which is considered a bioindicator species. The experiment was carried out at five development stages of S. bicolor (40, 50, 60, 70, and 80 days after emergence), which was used as aqueous extract at six concentrations (0, 20, 40, 60, 80, and 100%) applied in four replications per treatment in 10 or 50 kale seeds per plot. The percentage of germination, germination rate index, root growth, shoot length, and dry matter of kale seedlings were analyzed in the presence of this extract on different days of collection and concentrations. The aqueous extract of S. bicolor presented an allelopathic effect on germination and initial growth of kale seeds, with a higher inhibitory effect when more concentrated extracts from pre-flowering plants were used, which corresponds to 60 days after emergence. Thus, this stage should be recommended in the use of S. bicolor straw to help in controlling weeds.

scholarly journals Allelopathic tolerance of pea cultivars to Sorghum halepense L. (Pers.) extracts

2016 ◽  
Vol 31 (1-2) ◽  
pp. 59-67 ◽  
Author(s):  
Natalia Georgieva ◽  
Ivelina Nikolova
Keyword(s):  
Pisum Sativum ◽  
Growth Parameters ◽  
Inhibitory Effect ◽  
Grain Protein Content ◽  
Sorghum Halepense ◽  
Allelopathic Effect ◽  
Initial Growth ◽  
Inhibitory Effects ◽  
Large Size ◽  
The Impact

In order to evaluate the allelopathic effect of Sorghum halepense extracts on germination and initial growth of six pea (Pisum sativum subsp. sativum, Pisum sativum subsp. arvense) cultivars and to identify tolerant cultivars, a laboratory experiment was conducted. The studied cultivars revealed different levels of susceptibility to allelopathic impact of root and aboveground biomass extracts of S. halepense. Root growth parameters (length and weight) of the pea cultivars exhibited greater susceptibility to weed extracts than stem parameters. The inhibitory effects of the extracts on germ length of P. sativum ranged from 1.4% (cultivar Mir) to 45.0% (Kamerton), on germ weight - from 3.5% (Pleven 4) to 42.9% (K-80), and on seed germination - from 11.8% (Mir) to 31.3% (K-80). Total inhibitory effect, i.e. the impact of S. halepense extracts on all studied parameters of P. sativum, revealed that the cultivars Mir and Pleven 4 were the most tolerant. Growing such cultivars may reduce weed damage. Low tolerance was manifested by the cultivar K-80, while Modus, Glyans and Kamerton ranked intermediate. The cultivars with large-size seeds or lower grain protein content were more affected by the depressing effect of S. halepense extracts.

scholarly journals Allelopathic effect of preparations of Betula pendula Roth., Chamomilla recutita L. and Urtica dioica L. on the initial growth of Hordeum vulgare L.

2015 ◽  
Vol 68 (1) ◽  
pp. 3-8
Author(s):  
Andrzej Dziamski ◽  
Zofia Stypczyńska
Keyword(s):  
Hordeum Vulgare ◽  
Betula Pendula ◽  
Water Solution ◽  
Urtica Dioica ◽  
Simultaneous Increase ◽  
Test Plant ◽  
Allelopathic Effect ◽  
Root Weight ◽  
Initial Growth ◽  
Leaves And Roots

The experiment investigated the effect of preparations of <em>Betula pendula</em>, <em>Chamomilla recutita</em>, and <em>Urtica dioica</em> on the initial growth of <em>Hordeum vulgare</em> under laboratory conditions. The experiment involved a water solution of sap from the trunk of <em>B. pendula</em>, an infusion from <em>Ch. recutita</em>, extracts from leaves and rhizomes as well as macerated herbage of <em>U. dioica</em>, at the concentrations of 2.5%; 5%; 10% and 20%. During the first four days of the growth of the test plants, the plant preparations tested had a stimulatory effect on the length of leaves and roots in all the cases. The leaf increases were greater than those of the roots and became smaller with an increase in the concentration of the preparations. Continued watering of <em>H. vulgare</em> seedlings resulted in a further increase in leaf length after the application of <em>U. dioica</em> macerate and <em>Ch. recutita</em> infusion, with a simultaneous increase in root length with the macerate of <em>U. dioica</em> and <em>B. pendula</em> sap used at the concentrations of 2.5–10%. The other extracts made from <em>U. dioica</em> leaves and roots, irrespective of the concentration applied, strongly reduced the increase in leaves and roots from 11 to 27%. The weight of roots and leaves in <em>H. vulgare</em>, over the entire range of the concentrations applied and irrespective of the duration of the experiment, was stimulated only by <em>B. pendula</em> sap. The extracts from <em>Ch. recutita</em> and <em>U. dioica</em>, especially the leaf and root extracts, significantly reduced the root weight of the test plant.

scholarly journals Variation in allelopathic tolerance of vetch cultivars to Sorghum halepense L. (Pers.) extracts

2018 ◽  
Vol 33 (1) ◽  
pp. 65-74
Author(s):  
Natalia Georgieva ◽  
Ivelina Nikolova ◽  
Valentin Kosev
Keyword(s):  
Seed Germination ◽  
Growth Parameters ◽  
Control Strategies ◽  
Inhibitory Effect ◽  
Sorghum Halepense ◽  
Allelopathic Effect ◽  
Initial Growth ◽  
Seedling Vigour ◽  
Initial Development ◽  
Randomized Design

Using allelopathic tolerance of crops and cultivars is considered a promising supplement to weed control strategies. In order to evaluate the allelopathic tolerance of vetch cultivars to Sorghum halepense extracts in germination and initial growth of the crop, a multi-factorial lab experiment was carried out based on a completely randomized design with four replications. The experimental factors were nine vetch cultivars (?Liya?, ?Lorina?, ?Moldovskaya?, ?Obrazets 666?, ?Asko?, ?Violeta?, ?Viola?, ?Beta WP?, and ?Panonskaya?), two aqueous extracts (of shoot and root biomass of S. halepense) and four concentrations of the extracts (1.0%, 5.0%, 10.0% and distilled water as a control). An analysis of variance showed a significant influence of the studied factors. The results revealed variation in responses of the nine cultivars to the allelopathic effect of S. halepense. The extracts applied at different concentrations had a significant inhibitory effect on seed germination (from 2.8 to 27.3% for different cultivars), germ length (from 4.6 to 48.7%) and germ weight (from 3.6 to 34.0%). The lowest concentration (1.0%) also had a stimulating effect on growth parameters, most pronouncedly in two cultivars (?Beta WP? and ?Viola?). Total effects of the weed extracts on seed germination and initial development selected ?Beta WP?, ?Violeta? and ?Obrazets 666? as the most tolerant cultivars, as opposed to ?Liya? and ?Panonskaya?, which were more sensitive. The cultivars with seeds that have greater biomass per 1000 seeds, higher seedling vigour index and protein content were found to be less sensitive to the suppressing effect of S. halepense extracts. These cultivars can be successfully used in organic fields with high density of S. halepense or in a conventional production system with a reduced use of herbicides.

scholarly journals Allelopathic effects of aqueous extract of leaves and roots of Luetzelburgia auriculata (Allemo) Ducke on seeds germination and initial growth of lettuce (Lactuca sativa L.)

2018 ◽  
Vol 13 (13) ◽  
pp. 635-643 ◽  
Author(s):  
Erika do Nascimento Fernandes PINTO ◽  
Jacob Silva SOUTO ◽  
Leonardo Francisco de Assis PEREIRA ◽  
Cesar Henrique Alves BORGES ◽  
Tassia Rayane Nascimento FERNANDES
Keyword(s):  
Aqueous Extract ◽  
Lactuca Sativa ◽  
Initial Growth ◽  
Lactuca Sativa L ◽  
Allelopathic Effects ◽  
Leaves And Roots ◽  
Seeds Germination

scholarly journals Heterocyclic Aromatic Amines in Meat: Formation, Isolation, Risk Assessment and Inhibitory Effect of Plant Extracts

Foods ◽  
2021 ◽  
Vol 10 (7) ◽  
pp. 1466
Author(s):  
Hafiz Rehan Nadeem ◽  
Saeed Akhtar ◽  
Tariq Ismail ◽  
Piero Sestili ◽  
Jose Manuel Lorenzo ◽  
...  
Keyword(s):  
Risk Assessment ◽  
Plant Extracts ◽  
Aromatic Amines ◽  
Extraction Procedure ◽  
Inhibitory Effect ◽  
Heating Time ◽  
Raw Material ◽  
Heterocyclic Aromatic Amines ◽  
Isolation And Identification ◽  
Cooked Meats

Heterocyclic aromatic amines (HAAs) are potent carcinogenic compounds induced by the Maillard reaction in well-done cooked meats. Free amino acids, protein, creatinine, reducing sugars and nucleosides are major precursors involved in the production of polar and non-polar HAAs. The variety and yield of HAAs are linked with various factors such as meat type, heating time and temperature, cooking method and equipment, fresh meat storage time, raw material and additives, precursor’s presence, water activity, and pH level. For the isolation and identification of HAAs, advanced chromatography and spectroscopy techniques have been employed. These potent mutagens are the etiology of several types of human cancers at the ng/g level and are 100- to 2000-fold stronger than that of aflatoxins and benzopyrene, respectively. This review summarizes previous studies on the formation and types of potent mutagenic and/or carcinogenic HAAs in cooked meats. Furthermore, occurrence, risk assessment, and factors affecting HAA formation are discussed in detail. Additionally, sample extraction procedure and quantification techniques to determine these compounds are analyzed and described. Finally, an overview is presented on the promising strategy to mitigate the risk of HAAs by natural compounds and the effect of plant extracts containing antioxidants to reduce or inhibit the formation of these carcinogenic substances in cooked meats.

Allelopathic Potency and an Active Substance from Hairy Vetch

2020 ◽  
Author(s):  
Weihong Sun ◽  
Guofeng Yang ◽  
Lili Cong ◽  
Juan Sun ◽  
Lichao Ma
Keyword(s):  
Seed Germination ◽  
Seedling Growth ◽  
Root Length ◽  
Leaf Extract ◽  
Growth Inhibitor ◽  
Inhibitory Effect ◽  
Allelopathic Effect ◽  
Coumaric Acid ◽  
Hairy Vetch ◽  
Allelopathic Effects

Background: Plant allelopathy refers to the release of chemicals from plants or microorganisms into the environment, may have direct or indirect, beneficial or harmful effects on other plants or microorganisms. When plants grow in an unfavorable environment,more allelochemicals will be secreted and the expression of allelopathic effects will increase, giving plants a certain competitive advantage. Hairy vetch is one of the most promising allelopathic crops and the aqueous extract of hairy vetch has an inhibitory effect on the root length and seedling height of grass crops. The current study aimed to study the allelopathic effect of hairy vetch on alfalfa, and exploring an ecological method to remove the root system of alfalfa.Methods: In this experiment, the allelopathic effects of the seeds, stems and leaves, roots extracts and root exudates (0, 3, 6, 9 and 12 mg·mL-1) on the seed germination and seedling growth of alfalfa were evaluated. And the main allelopathic substances from the stem and leaf extract were isolated and identified using high performance liquid chromatography- mass spectrometry (HPLC-MS).Result: The results showed that all of the extracts can inhibit alfalfa seed germination and seedling growth and stem and leaf extract had the strongest inhibitory effect, especially for inhibiting the root growth. A main allelochemical substance, o-coumaric acid, was screened out and the root length of alfalfa was completely inhibited at 1.6 mg·mL-1 of o-coumaric acid. The findings of these experiments show hairy vetch has strong allelopathic effect on alfalfa and o-coumaric acid is a chemical growth inhibitor.

scholarly journals EFFICIENCY OF SOME PLANT EXTRACTS TO CONTROL OF PENICILLIUM ITALICUM WEHMER CAUSING BLUE MOLD ON LEMON FRUITS IN IRAQ

2019 ◽  
Vol 31 (1) ◽  
pp. 01-05
Author(s):  
Ahed A.H. Matloob ◽  
Hamid A A. Khafaji
Keyword(s):  
Plant Extracts ◽  
Water Extract ◽  
Inhibitory Effect ◽  
Penicillium Italicum ◽  
Blue Mold ◽  
Lemon Fruit ◽  
Water Extracts ◽  
Wild Mustard ◽  
First Time ◽  
High Inhibitory Effect

The study aimed to evaluate the efficacy of the water extract of Propolis, Wild mustard and dates vinegar in the inhibition of Penicillium italicum causal agent of Blue mold on a lemon fruits. The results showed that all tested extracts with concentrations 5, 10 and 15% had a high inhibitory effect against P. italicum. Dates vinegar is highly effective and showed 100% inhibition of P. italicum and protected lemon fruit from infection. First time this type of natural inhibitory water extracts are used in Iraq which resulted that the dates vinegar is the best suitable option for the management of lemon blue mold disease in post-harvest.

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