Allelopathic Effect of Leaf Extract of Parthenium hysterophorus L. on Seed Germination and Growth of Cicer aeritinum L.

In present study the allelopathic effect of aqueous leaf extracts of Clerodendrum viscosum, Ageratum conyzoides and Parthenium hysterophorus was observed on the seed germination of Chickpea in vitro (Cicer arietinum.L.).Seed germination was found to be inhibited in all the leaf extract concentrations used i.e. 2%,4%,6%,8% and 10%. However higher inhibition was observed in the 10% leaf extract of the test plants (i.e. Cl. viscosum, Ag. conyzoides and P. hysterophorus). In compare to all allelopathic plants extracts more inhibition was found in P. hysterophorus leaf extract followed by Cl. viscosum and Ag. conyzoides. Higher inhibition of radical and plumule growth of the Chickpea seeds was found with the increase in concentration of the leaf extracts used. Percentage of germination of Chickpea seeds was found to be low in 10% concentration whereas in untreated seeds it was found to be more.

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Allelopathic Potency and an Active Substance from Hairy Vetch

Legume Research - An International Journal ◽

10.18805/lr-548 ◽

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.

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Allelopathic Effect of Aqueous Extracts of Parthenium (Parthenium Hysterophorus L.) Parts on Seed Germination and Seedling Growth of Maize (Zea Mays L.)

Journal of Agriculture and Crops ◽

10.32861/jac.412.157.163 ◽

2018 ◽

Keyword(s):

Zea Mays ◽

Seed Germination ◽

Seedling Growth ◽

Zea Mays L ◽

Parthenium Hysterophorus ◽

Allelopathic Effect ◽

Aqueous Extracts

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Propagation and Possible Allelopathic Effects of Vernoniazeylanica on Selected Bioassay Species

CORD ◽

10.37833/cord.v36i.428 ◽

2020 ◽

Vol 36 ◽

pp. 41-46

Author(s):

S.H.S. Senarathne ◽

S. S. Udumann

Keyword(s):

Seed Germination ◽

Plant Species ◽

Seedling Growth ◽

Contaminated Soil ◽

Leaf Extract ◽

Cocos Nucifera ◽

Test Plant ◽

Allelopathic Effect ◽

Aqueous Leaf Extract ◽

Allelopathic Effects

Vernonia zeylanica (L.) belongs to the family Asteraceae, is one of the major endemic weed species present in coconut (Cocos nucifera L.) plantations of the tropics, which propagates very easily. There is a possibility that this plant could also possess allelopathic effects, but this has not been scientifically tested. Thus, a study was carried out to determine the seed germination of V. zeylanica under soil moisture stress conditions, shoot propagation methods and possible allopathic effects of this species, on selected species in bioassay tests. Germination of V. zeylanica seeds was not observed at higher osmotic potential (-0.9 MPa). The highest sprouting percentage of this species were obtained with soft wood cuttings. The aqueous leaf extract was highly phytotoxic, and it significantly reduced germination and seedling growth of all bioassay species tested. Full strength (33.3 g L-1) aqueous extracts of leaves significantly reduced the germination percentage, root and hypocotyl growth rates of all species tested. The inhibitory effects were often dependent on concentration. However, the degree of inhibition varied among the test plant species. The seedling emergences of all four tested plants were severally inhibited when planted in V. zeylanica contaminated soil. The results indicated that incorporated aqueous leaf extract of V. zeylanica and its rhizosphere contaminated soil can suppress seed germination, seedling growth and seedling emergence of certain plant species indicating a possible allelopathic effect.

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Allelopathic Effect of Leaf Extract of Two Wild Plants on Seed Germination, Shoot and Root Lengths of Two Weed Species; Portulacaoleracea and Chenopodium murale

Biosciences Biotechnology Research Asia ◽

10.13005/bbra/2704 ◽

2018 ◽

Vol 15 (4) ◽

pp. 929-935 ◽

Cited By ~ 1

Author(s):

Nadi Awad Al-Harbi

Keyword(s):

Seed Germination ◽

Weed Management ◽

Leaf Extract ◽

Inhibitory Effect ◽

Portulaca Oleracea ◽

Wild Plants ◽

Allelopathic Effect ◽

Weed Species ◽

Chenopodium Murale

The present study aims to evaluate the effect of leaf extract of Rhanterium epapposum and Salsola imbricata at various concentrations (20%, 40%, and 60%) on the germination and shoot and root lengths of two weed species; Portulaca oleracea and Chenopodium murale. The present study findings proved that the inhibitory effect of seed germination and shoot and root lengths of the studied species was largely dependent on the concentration of R. epapposum and S.imbricata leaf extract. The results showed that the highest allelopathic effect on the germination of the seeds of C.murale by leaf extract of R. epapposum and S. imbricata especially at concentration of 40% and 60% . While the lowest effect was of the leaf extract of S.imbricata. However the concentration of 60% was higher on the germination of the seeds C. murale and P. oleracea. Results also showed that the root and shoot lengths of C. murael was more sensitive to allelochemicals of R. epapposum leaf extract compared to S.imbricata leaf extract. However, the root and shoot lengths of P. oleracea was more sensitive to allelochemicals of S. imbricata leaf extract compared to R.epapposum leaf extract. Hence, the present findings recommended using the R. epapposum leaf extract and S. imbricata leaf extract as a tool for weed management especially C. murale and P. oleracea.

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Allelopathic Effect of Artemisia Dubia Extracts on Seed Germination and Seedling Growth of Some Weeds and Winter Crops

Ecoprint An International Journal of Ecology ◽

10.3126/eco.v21i0.11901 ◽

2015 ◽

Vol 21 ◽

pp. 23-30

Author(s):

Baby Babita Das Mallik ◽

BD Acharya ◽

M Saquib ◽

MK Chettri

Keyword(s):

Seed Germination ◽

Seedling Growth ◽

Leaf Extract ◽

Cyperus Rotundus ◽

Allelopathic Effect ◽

Ageratum Conyzoides ◽

Bidens Pilosa ◽

Winter Crops ◽

Allelopathic Effects ◽

Artemisia Dubia

Allelopathic effects of aqueous extract of different plant parts (root, stem and leaf) of Artemisia dubia on seed germination and seedling growth of two winter crops (Triticum aestivum and Brassica campestries, and some associated weeds (Bidens pilosa, Ageratum conyzoides, Galinsoga parviflora and Cyperus rotundus) have been investigated in the present study. Extracts of root, stem and leaves of Artemisia dubia showed significant reduction in germination and seedling growth of test crops and weeds. Germination of crop and weed seeds and growth of shoot and root were reduced significantly in test treatments in comparison to the control. The seed germination, shoot length and root length were low at higher concentration. Complete inhibition of seed germination of Ageratum conyzoides, Galinsoga parviflora and Cyperus rotundus at 5 and 10% leaf extract of A.dubia was observed. Allelopathic effects were more pronounced with leaf extract than root or stem extract in most cases.The result indicated difference in allelopathic effect on crop seed and weed seed at higher concentrations. ECOPRINT 21: 23-30, 2014DOI: http://dx.doi.org/10.3126/eco.v21i0.11901

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