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Allelopathic effect of Azadirachta indica L. on the germination of Abelmoschus esculentus L.

100%

Vaithiyanathan T., Soundari M., Rajesh M., Sankar Ganesh K., Sundaramoorthy P.

International Letters of Natural Sciences

|

2014

|

tom 10

The chemical compounds have been reported to be exuded by plants and their inhibitory effects of other plants. The research work was carried out to study the allelopathic effect of root, bark and leaf extracts of Azadirachta indica L. on the seed germination of Abelmoschus esculentus L. Germination studies were conducted in laboratory, the bhendi seeds treated with the root, bark and leaf extracts of Neem. On the seventh day the morphological parameters, photosynthetic pigment and biochemical contents were analysed. The result showed that the rate of germination of bhendi decreased in all Azadirachta indica L. extracts. The reduction in biochemical contents of bhendi was also noted. The highest rate of germination was observed in control (distilled water) treatment and the highest rate of inhibition was observed in root extract followed by bark and leaf extracts.

2

Plant-plant allelopathy, preliminary investigations of the role of the cAMP signalling pathway

100%

Lbik-Nowak A., Godlewski M., Domanska A., Aniol P., Bilecka A.

Cellular and Molecular Biology Letters

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2002

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tom 07

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nr Suppl.

3

Biochemical impact of dominant extracts of Scots pine cuttings on germination

86%

Balezentiene L., Seziene V.

Polish Journal of Environmental Studies

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2010

|

tom 19

|

nr 1

35-42

The main objective of this study was to determine the allelopathic impact of dominant species (Calamagrostis epigeios, Rubus idaeus and Chamaenerion angustifolium) of clear-cuttings of Scots pine (Pinus sylvestris L.) forests (Vaccinio-myrtillo Pinetum) on test species germination emphasizing the forest ecosystem establishment. Aqueous extracts of roots and shoots were produced at different growth stages and assayed on germination. Additionally, total concentration of phenols was evaluated photo spectrometrically. Extracts of shoots more strongly inhibited germination than those of roots of all investigated species. The strongest inhibitory effect on germination and the highest phenol contents were documented during the flowering stage rather than in spring and autumn. Accordingly, to mean germination data the declining phytotoxicity sequence of the species was determined: R. idaeus > C. epigeios > Ch. angustifolium. Hence this study implied in allelopathic activity of species a potential suppressive factor that could influence germination and forest regeneration, but field condition studies are necessary.

4

Alleloherbicydy - wczoraj i dzis

86%

Sobotka W.

Progress in Plant Protection

|

1997

|

tom 37

|

nr 1

50-57

5

Wild oat [Avena fatua L.] and canary grass [Phalaris minor Ritz.] management through allelopathy

72%

Jabran K., Farooq M., Hussain M., Hafeez-ur-Rehman, Ali M. A.

Journal of Plant Protection Research

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2010

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tom 50

|

nr 1

41-44

Environmental contamination, herbicide resistance development among weeds and health concerns due to over and misuse of synthetic herbicides has led the researchers to focus on alternative weed management strategies. Allelochemicals extracted from various plant species can act as natural weed inhibitors. In this study, allelopathic extracts from four plant species sorghum [Sorghum bicolor (L.) Moench], mulberry (Morus alba L.), barnyard grass [Echinochloa crusgalli (L.) Beauv.], winter cherry [Withania somnifera (L.)] were tested for their potential to inhibit the most problematic wheat (Triticum aestivum L.) weeds wild oat (Avena fatua L.) and canary grass (Phalaris minor Ritz.). Data regarding time to start germination, time to 50% germination, mean germination time, final germination percentage, germination energy, root and shoot length, number of roots, number of leaves, and seedling fresh and dry weight was recorded for both the weeds, which showed that mulberry was the most inhibitory plant species while sorghum showed least allelopathic suppression against wild oat. Mulberry extracts resulted in a complete inhibition of the wild oat germination. The allelopathic potential for different plants against wild oat was in the order: mulberry > winter cherry > barnyard grass > sorghum. Mulberry, barnyard grass and winter cherry extracts resulted in a complete inhibition of canary grass. Sorghum however exhibited least suppressive or in some cases stimulatory effects on canary grass. Plants revealing strong allelopathic potential can be utilized to derive natural herbicides for weed control.

6

Allelopathic interactions between the red-tide causative dinoflagellate Prorocentrum donghaiense and the diatom Phaeodactylum tricornutum

72%

Cai Z., Zhu H., Duan S.

Oceanologia

|

2014

|

tom 56

|

nr 3

7

Allelopathy in Solanaceae plants

72%

Mushtaq W., Siddiqui M. B.

Journal of Plant Protection Research

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2018

|

tom 58

|

nr 1

Solanaceae plants have strong allelopathic potential, and therefore the action is confirmed through: a) bioassays with liquid or various solvent extracts and residues, b) fractionation, identification, and quantification of causative allelochemicals. Most assessments of allelopathy involve bioassays of plant or soil extracts, leachates, fractions, and residues which support seed germination and seedling growth in laboratory and greenhouse experiments. Plant growth is also stimulated below the allelopathic threshold, however severe growth reductions may be observed above the threshold concentration depending on the sensitivity of the receiving species. Generally, seedling growth is more sensitive than germination, particularly root growth. Some approaches showed that field soil collected beneath donor plants significantly reduced or somewhat promoted the growth of the recipients plants. Petri dish bioassays with aqueous extracts of different parts of donor plants showed considerable phytotoxic activities in a concentration-dependent manner with leaf aqueous extracts being most dominant. Delayed seed germination and slow root growth attributable to the extracts may be baffled with diffusion effects on the rate of imbibition, delayed initiation of germination, and particularly cell elongation; the main factor that is responsible for affecting root growth before and after the tip penetrates the testa. Light and electron microscopy extract analysis at the ultrastructural level are correctly investigated. Several Solanaceae plants have allelopathic potential, and therefore the activities, kinds and quantity of allelopathic compounds differ depending on the plant species. The incorporation of allelopathic substances into agricultural management might scale back the development of pesticides and reduce environmental deterioration.

8

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

72%

Jankowska J., Ciepiela G. A., Sosnowski J., Kolczarek R., Jankowski K.

Acta Agrobotanica

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2009

|

tom 62

|

nr 2

The common dandelion (Taraxacum officinale 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 (Taraxacum officinale) as well as soil extracts from the root layer of this species on seed germination and the initial growth of Lolium westerwoldicum R.Br. The investigated material comprised leaves and roots of Taraxacum officinale. 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 Taraxacum officinale. The germination ability of seeds of Lolium westerwoldicum 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 Taraxacum officinale 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 Taraxacum officinale on germination and initial growth of Lolium westerwoldicum, and especially that of extracts prepared from leaves.

9

The effect of no-ploughing tillage using cover crops on primary weed infestation of carrot

72%

Blazewicz-Wozniak M., Patkowska E., Konopinski M., Wach D.

Acta Scientiarum Polonorum. Hortorum Cultus

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2015

|

tom 14

|

nr 2

In the era of sustainable agriculture, is looking for new unconventional methods to control weed infestation. The aim of the study was to determine the effect of cover crop biomass and the manner and time of mixing it with the soil on primary weed infestation of carrot compared with the conventional plough cultivation without the use of cover crops. The cover crop plants modified the state and reduced the degree of primary weed infestation of carrot compared to cultivation without cover crops. White mustard was the most effective in reducing primary weed infestation of carrot in all variants of tillage. Phacelia, buckwheat and oat cover crops also limited largely the number of weeds in carrot. The largest number of weeds was recorded in no-cover crop cultivation in no-tillage objects and those cultivated using subsoiler before winter, and cultivating in spring with aggregate. The largest reduction of primary weed infestation compared to conventional tillage was achieved in cultivation on ridges, with white mustard, phacelia or oats cover crops and weakest after vetch cover crop. In no-ploughing flat tillage system, lack of cover crop significantly increased the degree of weed infestation compared to conventional tillage, while the use of cover crops contributed to the reduction of primary weed infestation of carrot compared to cultivation without cover crops.

10

Plant-soil feedback in herbaceous species of Mediterranean coastal dunes

72%

Bonanomi G., Esposito A., Mazzoleni S.

Biological Letters

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2012

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tom 49

|

nr 1

11

Weed allelochemicals and possibility for pest management

72%

Tran D. X., La H. A., Do T. k., Phung T. T., Truong N. M., Tran D. K., Khuat H. T.

International Letters of Natural Sciences

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2016

|

tom 56

Purpose: Weed interference is a constraint in agricultural practice. The crop-weed interaction has been extensively described in literature, but the weed-weed interaction and their potential usage in crop production have not much been understood. In this paper, the interactions of allelochemicals of the weeds which cause troublesome in crop production and ecosystem against weeds, crops, and pathogens are described. Principal results: Weed allelochemicals are classified into many chemical classes, and the majority is consisting of phenolics acids, alkaloids, terpenes, flavonoids, long chain fatty acids, lactones, and other volatile compounds. Type of weed allelochemicals and their doses are varied among weed species. Some allelochemicals such as catechin (+/-) have been reported to be responsible for weed invasiveness. Some crops exude germination stimulants to parasitic weeds such as Striga spp. and Orobanche spp. In contrast to their negative impacts on crop production, many weeds can be exploited as promising sources to control harmful insects, fungi, bacteria, and weeds. For instance, Ageratum conyzoides is a destructive weed in crop production, but it exerted excellent insecticidal, antifungal, and herbicidal capacity and promoted citrus productivity in A. conyzoides intercropped citrus orchards. Major conclusions: In general, weeds compete with crops by chemical pathway by releasing plant growth inhibitors to reduce crop growth. Weed allelochemicals may be successfully exploited for pest and weed controls in an integrated sustainable crop production. Some weed allelochemicals are potent for development of natural pesticides.

12

Effect of juglone on C-32 and COLO 829 melanoma cells in in vitro cultures

72%

Zielinska A., Plonka-Czerw J., Kusmierz D.

BioTechnologia. Journal of Biotechnology Computational Biology and Bionanotechnology

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2022

|

tom 103

|

nr 1

13

Allelopathic interactions between plants. Multi site action of allelochemicals

72%

Gniazdowska A., Bogatek R.

Acta Physiologiae Plantarum

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2005

|

tom 27

|

nr 3B

Allelopathy is defined as mechanism of plant-plant, plant-microorganisms, plant-virus, plant-insect, and plant-soil-plant interactions mediated by plant- or microorganism-produced chemicals released to the environment. The majority of allelochemicals are secondary metabolites and among others belong to terpenoids, phenolic compounds, organic cyanides and longchain fatty acids. The action of allelochemicals in target plant is diverse and affects a large number of biochemical reactions resulting in modifications of different physiological functions. Thus the results of allelochemical action can be detected at different levels of plant organization: molecular, structural, biochemical, physiological and ecological. Enzyme activities, cell division and ultrastructure, membrane permeability, ion uptake and as a consequence plant growth and development are modified by allelochemicals. Significant effects on photosynthesis and respiration are the best-characterized results of allelopathic interactions. Moreover allelopathic compounds seem to induce a secondary oxidative stress expressed as enhanced free radical production and induction of cellular antioxidant system. Plant survival under allelopathy stress conditions depends on plant defense leading to allelochemical detoxication, the process which may go on in parallel to cell defense reaction to oxidative stress. The article presents some aspects of the current knowledge regarding mechanisms of the allelopathy phenomenon. The allelopathy is a complex problem, thus comprehensive understanding of allelochemical mode of action requires further investigation and still remains an open question.

14

Abscisic acid-glucose ester as an allelopathy agent from citrus fruit

72%

Kato-Noguchi H., Tanaka Y.

Acta Physiologiae Plantarum

|

2006

|

tom 28

|

nr 6

Aqueousmethanol extracts of Citrus junos, C. unshiu and C. sudachi fruit peel inhibited the growth of the roots and hypocotyls of alfalfa (Medicago sativa L.), cress (Lepi dium sativum L.) and lettuce (Lactuca sativa L.) seedlings. Significant reductions in the root and hypocotyl growth were observed as the extract concentration in creased in all bioassays. The inhibitory activity of C. junos extract on the growth of test plants was 3.3- to 17.9-fold and 3.6- to 20.6-fold greater than that of C. unshiu and C. sudachi extracts, respectively.The concentration in C. junos was 3.5- and 4.9-fold greater than that in C. unshiu and C. sudachi, respectively. Thus, there was a good correlation- between abscisic acid-b-D-glucopyranosyl ester (ABA-GE) concentrations in C. junos, C. unshiu and C. sudachi fruit peel and the inhibitory activities of their extracts.The concentratio of ABA-GE in C. junos fruit peel was in creased with fruit maturity as growth inhibitory activity of C. junos fruit peel was reported to be in creased with fruit maturity, indicating that the concentrations of A BA-GEin C. junos fruit peel was correlated with growth inhibitory activity of C. junos fruit peel in time course of fruit maturation. These findings suggest that ABA-GE may be involved in the growth in hibitory effect of C. junos, C. unshiu and C. sudachi fruit peel.

15

The in situ influence of Ceratophyllum demersum on a phytoplankton assemblage

58%

Pelechata A., Pelechaty M.

Oceanological and Hydrobiological Studies

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2010

|

tom 39

|

nr 1

95-101

16

Competition between sessile oak (Quercus petraea) and black cherry (Padus serotina): dynamics of seedlings growth

58%

Robakowski P., Bielinis E.

Polish Journal of Ecology

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2011

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tom 59

|

nr 2

Competition is an evolutionary mechanism which exerts a selection pressure on living organisms. Forest trees compete for light, water and nutrients, especially at a young age. It was observed that the Quercus petraea and Padus serotina natural regenerations occupied the same site growing under the canopy of Scots pine (Pinus silvestris L.). To simulate the competition between young sessile oaks and black cherries found in forest, a controlled experiment was conducted using one-year-old seedlings of both species. There were eight treatments of different competition intensity. The treatments were established varying the number of potted seedlings and adding fresh cherry leaves to the substrate to enhance allelopathic effects. It was hypothesized that black cherry would reduce the height growth and diameter at root collar of sessile oak seedlings and this inhibitory effect would be magnified by an increasing number of cherry seedlings and/or fresh leaves. Black cherry as an invasive, fast-growing species was presumed to win the growth competition with oak. However, the differences in growth parameters would not only depend on genetic differences between the species, but also on the number of competing seedlings in pots and an allelopathic effect of cherry leaves. During the whole vegetative season, each two weeks, the growth parameters of seedlings (height, height increment and diameter at root collar) were measured. The results did not support the hypothesis that cherry had an inhibitory effect on oak growth, at least after one vegetative season. Contrary, a presence of cherry seedlings enhanced the oak height increment (F = 8.6, P <0.001) which might be due to either the strong interspecific competition for light or, less plausibly, positive allelopathic effect, or an interaction of both. Our results indicated a negative auto-allelopathic effect of cherry seedlings and/or fresh cherry leaves on height of cherry seedlings (F = 47.7, P <0.001). This invader showed a continuous and steep height increment within the whole vegetative season, whereas oak seedlings grew rapidly only in July. When compared the mean initial heights in April with those after the bud set in September, cherry was four fold and oak only two fold higher. A very intensive height increment gives black cherry an advantage over sessile oak at a young age which can disturb the spontaneous conversion of pine stands into a mixed pine-oak forest with a greater share of oak and other native deciduous tree species.

17

Initial growth of Phleum pratense under the influence of leaf water extracts from selected grass species and the same extracts improved with MgSO4 7H2O

58%

Lipinska H., Lipinski W.

Journal of Elementology

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2009

|

tom 14

|

nr 1

101-110

In multi-species grassland communities, plant growth and development are modified by both a number of habitat-related factors and physico-chemical processes resulting from the neighbourhood of other species. Plant interactions mediated through chemical substances are identified within the allelopathic processes. The allelopathic process involves excretion of bioactive compounds from plant or microorganisms that inhibit or stimulate physiological processes of the neighbour plants. The allelopathic compounds can exert a harmful impact on the emergence of seedlings, initial development and installation. Therefore, it is essential to reduce the allelopathic influence of the old sward on the plants sown as well to limit the interaction between these new plants. It is claimed that, among others, fertilizer components may partially reduce effects of allelopathic influences In this study we show the differences in growth inhibition of Ph. pratense seedlings caused by the water extracts of leaves of selected grass species and the amelioration of growth inhibition by addition of magnesium sulfate. The bioassays were performed on Petri dishes under the laboratory conditions. The activity of allelopathic substances in the leaf extracts was evaluated by the degree of inhibition of seed germination, seedling height and root length compared to the control objects (supplied with distilled water). The amelioration of the negative allelopathic effects by a complete nutrient component with or without the addition of magnesium sulfate was also evaluated against the appropriate controls and compared to the objects where blotting-paper was moistened only with leaf extracts. The present studies confirmed the defensive activity of magnesium sulfate against the allelopathic compounds of the tested grass species affecting the initial growth and development of Phleum pratense. The obtained results indicate potential elimination of the allelopathic negative influence of plants through suitable fertilization.

18

Allelopathic effect of lamiaceous weeds on seed germination and early growth of aromatic rice (Oryza sativa‘Gobindobhog’)

58%

Oraon S., Mondal S.

Acta Agrobotanica

|

2021

|

tom 74

|

nr 1

19

Signalling role of ROS and phytohormones in allelopathic interactions between plants

58%

Bogatek R., Oracz K., Gniazdowska A.

Acta Physiologiae Plantarum

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2007

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tom 29

|

nr 1 Suppl.

20

Different sensitivities of unicellular and colonial microcystis strains (Cyanophyceae) to six emergent macrophytes

58%

Zhao J., He X., Sun P., Zhang S.

Polish Journal of Environmental Studies

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2013

|

tom 22

|

nr 5

The effects of six emergent macrophytes (Typha orientalis, Acorus calamus, Oenanthe javanica, Scirpus validus, Sagittaria sagittifolia, and Pontederia cordata) on the growth of two strain Microcystis aeruginosa were studied under co-culture conditions. And the sensitivities of unicellular and colonial Microcystis strains to six emergent macrophytes were compared using an exudation experiment. Based on laboratory experiments, T. orientalis, A. calamus, O. javanica, S. validus, S. sagittifolia, and P. cordata had strong inhibitory effects on growth of unicellular M. aeruginosa, while only A. calamus and P. cordata show obvious growth inhibition on colonial M. aeruginosa. When the biomass density was 20 g FW·L⁻¹, the growth inhibition rate of unicellular M. aeruginosa can exceed 90% for all of the six emergent macrophytes. When macrophytes coexisted with the colonial M. aeruginosa, only A. calamus, P. cordata, and S. sagittifolia showed the growth inhibition of algae. Maximal inhibition of Chl a growth was 75% (p<0.05) for A. calamus, 69% (p<0.05) for P. cordata, and 40% for S. sagittifolia at 45 g FW·L⁻¹ on day 15. The results of the exudation experiment indicated that there were no significant differences between control and treatment of Chl a concentrations of colonial M. aeruginosa for all of the six macrophyte exudations on days 6 and 12. While after 6 d incubation in 100% and 50% macrophyte exudations (40 g FW·L⁻¹), the cell densities of unicellular M. aeruginosa in control were obviously higher than all those in treatment (p < 0.05). The maximal algal growth inhibition (89.62%) of unicellular M. aeruginosa was achieved in 100% exudation of A. calamus on day 6 (p < 0.05). So according to the results of exudation experiments, the unicellular M. aeruginosa was more sensitive than the colonial strain to six emergent macrophytes. And this different sensitivity between Microcystis species probably correlated positively with colony size.

Ograniczanie wyników

Allelopathic effect of Azadirachta indica L. on the germination of Abelmoschus esculentus L.

Plant-plant allelopathy, preliminary investigations of the role of the cAMP signalling pathway

Biochemical impact of dominant extracts of Scots pine cuttings on germination

Alleloherbicydy - wczoraj i dzis

Wild oat [Avena fatua L.] and canary grass [Phalaris minor Ritz.] management through allelopathy

Allelopathic interactions between the red-tide causative dinoflagellate Prorocentrum donghaiense and the diatom Phaeodactylum tricornutum

Allelopathy in Solanaceae plants

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

The effect of no-ploughing tillage using cover crops on primary weed infestation of carrot

Plant-soil feedback in herbaceous species of Mediterranean coastal dunes

Weed allelochemicals and possibility for pest management

Effect of juglone on C-32 and COLO 829 melanoma cells in in vitro cultures