scholarly journals Growth and Molecular Expression of Okra Seeds Interacted with Fourteen Mango Cultivars in Mixed Cropping System

2017 ◽  
Vol 9 (8) ◽  
pp. 193
Author(s):  
Ream I. Marzouk ◽  
Salama M. El-Darier ◽  
Mona E. Mabrouk ◽  
Kholod A. Khattab
Keyword(s):  
Growth Parameters ◽  
Mangifera Indica ◽  
Protein Profile ◽  
Cropping System ◽  
Allelopathic Effect ◽  
Aqueous Extracts ◽  
Mixed Cropping ◽  
Hypocotyl Length ◽  
Seedling Vigour ◽  
Allelopathic Potential

The present study was accomplished to study the effect of fourteen cultivars (Keitt, Ewais, White Succari, Tommy Atkins, Fajri Klan, Zebda, Alphonso, Sedeek, Naomi, Mesk, Baladi Dabsha, Baladi Arnaba, Cobania and Totapuri) of Mangifera indica L. leaves aqueous extracts (MILAE) on germination and some growth parameters as well as seedling protein profile of Hibiscus esculentus L. (okra seeds) in mixed cropping system. The study was extented to characterize and discriminate among the aforementioned cultivars. The allelopathic potential of fourteen cultivars of M. indica leaves aqueous extracts (MILAE) on germination efficiency and growth parameters of H. esculantus L. seeds (as a recipient bioassay material) was completely studied. Hypocotyl length (HL) was more sensitive than radicle length (RL) for all studied cultivars. At the all concentrations level, Mesk cultivar exerted the highest allelopathic effect, while Totapuri cultivar showed the lowest one on the germination percentage (GP), inhibition percentage (IP), the time to get 50% germination (T50), mean germination time (MGT), germination energy (GE), seed germination index (SGI), emergence percentage (EP), mean emergence time (MET), seedling emergence index (EI), seedling vigour index (SVI), hypocotyl (HL) and radicle (RL) lengths, seedling fresh (SFW) and dry (SDW) weights.Seedling protein electrophoresis data revealed that Tommy Atkins cultivar attained the minimum values for both the number of bands and the percentage of polymorphism, 6 bands and 27%, respectively. On the other hand, the maximum values were achieved from both Naomi and Totapuri cultivars, 11 bands and 51%. Reversibly, the genomic template stability (GTS %) oscillated from 32% in Cobania cultivar to 64% in specimen Tommy Atkins cultivar. The resulted dendrograms by using allelopathic and molecular data as well as seedling protein electophoresis ascertains three aggregations. The first assembly includes Sedeek, Naomi and Mesk cultivars. The second gathers Keitt and Ewais cultivars. While, the third clusters Fajri Klan, Zebda and Alphonso cultivars.

scholarly journals EFECTO ALEPOPÁTICO DE TRES EXTRACTOS VEGETALES SOBRE EL DESARROLLO DE RAPHANUS SATIVUS (BRASSICACEAE) EN EL PERÚ

2019 ◽  
pp. 1-3
Keyword(s):  
Raphanus Sativus ◽  
Allium Sativum ◽  
Dry Weight ◽  
Persea Americana ◽  
Allelopathic Effect ◽  
Aqueous Extracts ◽  
Ruta Graveolens ◽  
Allelopathic Potential ◽  
Raphanus Sativus L ◽  
Water Treatments

EFECTO ALEPOPÁTICO DE TRES EXTRACTOS VEGETALES SOBRE EL DESARROLLO DE RAPHANUS SATIVUS (BRASSICACEAE) EN EL PERÚ ALLELOPATHIC EFFECT OF THREE PLANTS EXTRACTS ON THE DEVELOPMENT OF RAPHANUS SATIVUS (BRASSICACEAE) IN PERÚ Hildebrando Ayala & Rafael La Rosa DOI: https://doi.org/10.33017/RevECIPeru2007.0007/ RESUMEN El uso de plantas con actividad alelopática en la actualidad resulta de gran importancia  porque nos permite el desarrollo de una agricultura rentable y no contaminante del medio ambiente. El objetivo de este trabajo fue estudiar la acción de extractos acuosos de ajo (Allium sativum L, Liliaceae), palta (Persea americana Mill, Lauraceae) y ruda (Ruta graveolens L, Rutaceae) sobre el desarrollo de la hortaliza rabanito (Raphanus sativus L, Brassicaceae). Los extractos se prepararon a partir de bulbos de A. sativum, semilla de P. americana y hojas y flores de R. graveolens a los cuales triturados se le adiciona agua hervida. Los tratamientos fueron extractos puros al (20% p/v). El diseño fue completamente aleatorizado con 4 repeticiones. Se determino peso fresco (g), peso seco (g), longitud de raíz (cm), longitud área (cm) y área foliar(cm2). Los datos se analizaron mediante ANOVA y Test de Tukey para la comparación de medias. Los resultados alcanzados muestran de que no existe efectos significativos en comparación con el control, del potencial alelopático de los extractos acuosos evaluados bajo condiciones controladas. Palabras claves: Extractos acuosos, semillas, hojas, flores, bulbos, Allium sativum, Persea americana, Ruta graveolens. ABSTRACT The use of plants with allelopathic activity nowadays is very important because it allows us to develop a profitable agriculture and non-polluting the environment. The objective of this work was to study the action of aqueous extracts of garlic (Allium sativum L, Liliaceae), avocado (Persea americana Mill, Lauraceae) and rough (Ruta graveolens L, Rutaceae) on the development of vegetable radish (Raphanus sativus L, Brassicaceae). The extracts were prepared from A. sativum bulbs, P. americana seeds and R. graveolens leaves and flowers to which he adds crushed boiled water. Treatments were the pure extracts (20% w / v). The design was completely randomized with 4 repetitions. It was found fresh weight (g), dry weight (g), root length (cm) long area (cm) and leaf area (cm2 ). The data was analyzed with Anova and Tukey test for the comparison of averages. The results show that there is no significant effects compared to the control of allelopathic potential of aqueous extracts tested under controlled conditions. Keywords: Aqueous extracts, seed, leaves, flowers, bulbs, Allium sativum, Persea americana, Ruta graveolens.

scholarly journals Comparison of allelopathic effects of some brassica species in two growth stages on germination and growth of sunflower

2011 ◽  
Vol 57 (No. 2) ◽  
pp. 52-56 ◽  
Author(s):  
E. Jafariehyazdi ◽  
F. Javidfar
Keyword(s):  
Germination Rate ◽  
Growth Stages ◽  
Distilled Water ◽  
Aqueous Extracts ◽  
Hypocotyl Length ◽  
Allelopathic Potential ◽  
Brassica Spp ◽  
Full Flowering ◽  
Significant Difference ◽  
Two Stages

Members of Brassicaceae have been frequently cited as allelopathic crop. The toxic effect of Brassica spp. may be caused by hydrolysis products of glucosinolates that occur in substantial amounts in the vegetative parts of Brassica spp. This study investigated the allelopathic potential of Brassica napus, B. rapa and B. juncea on the sunflower seed germination and seedling growth. Aqueous extracts of three species from two stages (full flowering and straw) of sampling were separately made with 0 (distilled water), 10, 20, 30 and 40% concentrations. This experiment was conducted in 2 × 3 × 5 factorial arrangement based on completely randomized design with five replications. There was a highly significant difference among different concentrations of extracts and also between two stages of extraction. All aqueous extracts significantly affected sunflower germination, germination rate, seedling root and hypocotyl length, fresh and dry matter weight when compared with distilled water control. The greatest concentration showed a stronger inhibitory effect. Root length was more sensitive to extracts than hypocotyl length.

scholarly journals Growth Response of Three Leafy Vegetables to the Allelopathic Effect of Vitellaria paradoxa

2015 ◽  
Vol 7 (4) ◽  
pp. 460-463 ◽  
Author(s):  
Olamide O. FOLARIN ◽  
Clement O. OGUNKUNLE ◽  
Stephen O. OYEDEJI ◽  
Saheed KOLAWOLE
Keyword(s):  
Growth Response ◽  
Growth Parameters ◽  
Leafy Vegetables ◽  
Allelopathic Effect ◽  
Vitellaria Paradoxa ◽  
Loamy Soil ◽  
Amaranthus Cruentus ◽  
Allelopathic Potential ◽  
Celosia Argentea ◽  
Plastic Containers

This study was conducted to evaluate the growth response of three leafy vegetables (Celosia argentea, Amaranthus cruentus and Amaranthus hypochodriacus) to the leaf extract of Vitellaria paradoxa. Forty-five (45) experimental plastic containers were filled with 5 kg of loamy soil each and randomly allocated to the following regimes: control, 20 g, 40 g, 60 g and 80 g of powdered leaves of V. paradoxa, in three (3) replicates for each test crop respectively. It was observed that the response of the three leafy vegetables, grown within different composition of V. paradoxa leaves, are concentration dependent with respect to the studied growth parameters (plant height, leaf number, leaf area, stem girth). This indicated that V. paradoxa has allelopathic potential on the studied vegetables and therefore it could be used for natural weed control.

scholarly journals Phytochemical Profile and Evaluation of the Allelopathic Effect of the Aqueous Extract of Fimbristylis miliacea (L.) Vahl (Cyperaceae)

2020 ◽  
Vol 8 (3) ◽  
pp. 310
Author(s):  
Ana Claudia Martins Da Silva ◽  
José Jailson Lima Bezerra ◽  
Ana Paula Do Nascimento Prata ◽  
Renan Cantalice De Souza ◽  
Cynthiane Lins de Albuquerque Paulino ◽  
...  
Keyword(s):  
Aqueous Extract ◽  
High Performance ◽  
Chemical Constituents ◽  
Allelopathic Effect ◽  
Aqueous Extracts ◽  
Allelopathic Potential ◽  
Phytotoxic Activity ◽  
Lactuca Sativa L ◽  
Phytochemical Profile ◽  
Germination Bioassays

The allelopathic potential of some plant species has been scientifically proven over the years. The use of such natural compounds with phytotoxic activity is an alternative to synthetic herbicides. Thus, this research aims to analyze the phytochemical profile and the allelopathic effect of aqueous extracts of Fimbristylis miliacea (L.) Vahl. The allelopathic potential was evaluated by germination bioassays using seeds from two receptor species (Lactuca sativa L. and Emilia fosbergii Nicolson) and seven concentrations of aqueous extracts of F. miliacea aerial and underground parts in triplicate. The variables evaluated were germination (G) and germination speed index (GSI). The data obtained were submitted to F test and the averages to regression analysis. In addition, phytochemical analyses were performed to analyze possible allelochemicals present in aqueous extracts of F. miliacea through phytochemical screening and by high performance liquid chromatography (HPLC). The aqueous extracts of aerial and underground parts of F. miliacea inhibit the germination of E. fosbergii seeds at all concentrations analyzed (0.94, 1.87, 3.75, 7.5, 15 and 30%). However, the same extracts do not show any effects when evaluated in L. sativa seeds. The aqueous extract of F. miliacea shows important chemical constituents (gallic acid, chlorogenic acid, rutin, luteolin, apigenin, acacetin, and alkaloids) that can be directly related to the allelopathic effects observed in E. fosbergii seeds.

Inhibitory Effect of Aqueous Extracts of Tree-legumes on Germination and Seedling Growth of Food Legume, Green Gram (Vigna radiata L.)

2021 ◽  
Author(s):  
Anbarasu Mariyappillai ◽  
Swaminathan Chitraputhira Pillai
Keyword(s):  
Root Length ◽  
Vigna Radiata ◽  
Shoot Length ◽  
Green Gram ◽  
Allelopathic Effect ◽  
Aqueous Extracts ◽  
Seedling Vigour ◽  
Delonix Regia ◽  
Plant Parts ◽  
Vigour Index

Background: Green gram (Vigna radiata), the third most important pulse crop, is grown in tank-fed, command areas after the harvest of paddy. In such areas, legume trees like Delonix regia and Peltophorum pterocarpum are commonly found and tree parts often fell in watercourses and were flown to crop fields along with irrigation water. Hence, it is necessary to study whether any allelopathic effect is present in these parts of trees which may affect the growth and development of green gram grown in farmland crops. Methods: Collected different tree parts viz., bark, leaf and fresh flower, a matured pod of Delonix regia and Peltophorum pterocarpum, cleaned and soaked distilled water at weight/volume ratio of 1:10 for 24 hrs. Aqueous extracts were filtered and tested for inhibition of green gram. Pot culture experiments were conducted with 10 treatments and four replications. Germination (%), shoot length (cm), root length (cm), fresh weight (mg), dry weight (mg), seedling vigour index-I and vigour index-II in green gram were recorded and the magnitude of inhibition versus simulation in bioassay was compared through response index.Result: Among the plant parts, Delonix regia flower and Peltophorum pterocarpum matured pods suppressed germination (45.00 and 60.00%), shoot length (13.87 and 13.39 cm), root length (4.27 and 10.49 cm), seedling vigour index-I (624.15 and 803.40) and seedling vigour index-II (960.75 and 948.00) respectively in green gram. This might due to presence of inhibitory chemicals in flowers of Delonix regia and matured pods of Peltophorum pterocarpum compared to other plant parts of trees.

scholarly journals Investigation of the Allelopathic Effect of Matricaria chamomilla L. Parts’ Aqueous Extracts on Germination and Seedling Growth of Two Moroccan Varieties of Durum Wheat

2021 ◽  
Vol 2021 ◽  
pp. 1-6
Author(s):  
Amine Elbouzidi ◽  
Noureddine Bencheikh ◽  
Sara Seddoqi ◽  
Mohamed Bouhrim ◽  
Youssef Bouramdane ◽  
...  
Keyword(s):  
Durum Wheat ◽  
Plant Species ◽  
Seedling Growth ◽  
Dry Weight ◽  
Control Group ◽  
Allelopathic Effect ◽  
Aqueous Extracts ◽  
Matricaria Chamomilla ◽  
Coleoptile Length ◽  
Allelopathic Potential

The phenomenon of allelopathy has been known for more than 2000 years. This phenomenon consists of the chemical interference of plant species (or other organisms), by enhancing, or inhibiting, the germination, seedling growth, or development of other plant species (or other organisms). This paper aimed to investigate the allelopathic potential of the aqueous extract of different parts of Matricaria chamomilla L. on germination parameters (radicle, coleoptile length, and dry weight) of two Moroccan varieties of durum wheat. Chamomile extracts from leaves, roots, or flowers at concentrations of 50 and 100 g·L−1 were prepared and applied to wheat durum seeds. The control group was given distilled water. In both studied varieties of durum wheat, only flowers’ aqueous extracts showed a significant positive allelopathic effect by increasing the studied parameters, while leaves and roots from chamomile showed an inhibiting potential on germination and seedling growth in varieties riyad and kanakis.

scholarly journals THE ALLELOPATHIC EFFECT OF MAIZE AND SORGHUM ON SOME PHYSIOLOGICAL TERISTICS OF WHEAT AND BROAD BEAN USING HYDROPONICS

2019 ◽  
Vol 25 (103) ◽  
pp. 90-118
Author(s):  
Hanaa H. Mohamed ◽  
Raghad M. Mirry
Keyword(s):  
Chlorophyll A ◽  
Chromatographic Analysis ◽  
Broad Bean ◽  
Control Treatment ◽  
Sand Culture ◽  
Soluble Carbohydrate ◽  
Allelopathic Effect ◽  
Aqueous Extracts ◽  
Chlorophyll B ◽  
Allelopathic Potential

Two experiments were conducted to test the allelopathic potential of aqueous extracts concentrations of maize (Zea mays L.) and sorghum (Sorghum bicolor L.) on some physiological characteristics of wheat (Triticum aestivum L.) and broad bean (Vicia faba L.) plants in two cultures. The effective allelochemicals available in extracts of maize and sorghum have been isolated and identified. The experiments included two factors, the Main plots were the growing culture (Sand culture and Soil culture) and the Sub-plots were five concentrations of (0,25,50,75 and 100%) the aqueous extracts of the whole plants (root and shoot for maize (in first experiment) and sorghum (in the second one), Results indicated that: Most of the studied characteristics in wheat and broad bean decreased in sand culture when treated with the aqueous extracts of maize and sorghum. Increasing the aqueous extracts of maize to 100% decreased the plant content of  soluble carbohydrate, chlorophyll a, chlorophyll b, protein to 0.29 ,0.39, 0.39 and 0.28 % in wheat, and to 0.28 , 0.46 , 0.53 and 0.46 % in broad bean. While Increasing the aqueous extracts of sorghum to 100% decreased the plant content of  soluble carbohydrate, chlorophyll a, chlorophyll b, protein to 0.34 and 0.56 and 0.64 and 0.39 % in wheat, and to 0.41 and 0.47 and 0.44 and 0.20 % in broad bean, respectively  compared to control treatment (0%). Chromatographic analysis revealed the presence of 8 compounds in aqueous extracts of maize. The isolated compounds are phenolic in nature and known to have potential phytotoxicity as syringic, gallic, caffeic, vanillic, ferulic, coumaric, catechol and hydroxybenzoic. While Chromatographic analysis revealed the existence of 10 compounds in aqueous extracts of sorghum, 8 of them similar to what found in maize in addition to  quinon, benzaquinon

scholarly journals Phytochemical Profile and Evaluation of the Allopathic Effect of Three Species of the Genus Cyperus (Cyperaceae)

2020 ◽  
Vol 8 (3) ◽  
pp. 569
Author(s):  
Ana Claudia Martins Da Silva ◽  
José Jailson Lima Bezerra ◽  
Ana Paula Do Nascimento Prata ◽  
Renan Cantalice De Souza ◽  
Cynthiane Lins de Albuquerque Paulino ◽  
...  
Keyword(s):  
High Performance ◽  
Germination Rate ◽  
Cyperus Rotundus ◽  
Allelopathic Effect ◽  
Aqueous Extracts ◽  
Phytochemical Screening ◽  
Allelopathic Potential ◽  
Lactuca Sativa L ◽  
Phytochemical Profile ◽  
Germination Bioassays

The genus Cyperus is widely distributed worldwide and occurs in various regions of Brazil. Research has reported the allelopathic potential of species belonging to this genus. From this perspective, the present study analyzes the phytochemical profile and allelopathic effect of seven concentrations of the aqueous extracts of Cyperus distans L., Cyperus laxus Lam., and Cyperus rotundus L. The allelopathic potential was evaluated in triplicate from germination bioassays on seeds of two species, Lactuca sativa L. and Emilia fosbergii Nicolson. In addition, phytochemical analyses were performed to analyze possible allelochemicals present in aqueous extracts of three species by phytochemical screening and high-performance liquid chromatography (HPLC). The evaluated variables were: germination (G) and germination speed index (GSI). The data obtained were submitted to the F test, and regression analysis was performed to compare means. The results showed higher susceptibility of E. fosbergii to aqueous extracts of C. distans, C. laxus, and C. rotundus at all concentrations analyzed (0.94, 1.87, 3.75, 7.5, 15, and 30%). In turn, the germination rate of L. sativa seeds decreased only at the highest concentrations (between 15 and 30%) of the same extracts. This allelopathic potential may be directly associated with the biosynthetization of phenolic compounds by Cyperus spp., analyzed in this study by phytochemical prospecting and HPLC.

scholarly journals Mixed Cropping System on Diversity and Density of Plant Parasitic Nematodes

2016 ◽  
Vol 8 (11) ◽  
pp. 147
Author(s):  
Kingsley Osei ◽  
Haruna Braimah ◽  
Umar Sanda Issa ◽  
Yaw Danso
Keyword(s):  
Growth Parameters ◽  
Cropping Systems ◽  
Block Design ◽  
Cropping System ◽  
Significance Test ◽  
Parasitic Nematodes ◽  
Total Biomass ◽  
Mixed Cropping ◽  
Pests And Diseases ◽  
Sole Cropping

<p>The potential of mixed cropping system on the diversity and suppression of nematodes was investigated at two locations in Ghana. The treatments in the study were; sole plantain, sole cassava and plantain+cassava systems replicated five and four times in a randomized complete block design (RCBD) at Kwadaso in the Ashanti and Assin Foso in the Central region of Ghana respectively. Growth parameters (height and girth) and components of yield (No. of suckers/plant, bunch weight/plant, No. of hands/plant, No. of fingers/plant) were studied on plantain in addition to No. of weevils per plant. On cassava, total biomass, tuber number and tuber weight (yield) were analyzed using GenStat software and means were separated with Fisher’s least significance test at a = 0.05. There were no differences in height and girth of plantain at Assin Foso. However, plant height was 25% and girth 13% more under sole plantain system over the mixed cropping system at Kwadaso. The sole plantain system recorded 60% and 75% more suckers than the Plantain-Cassava system at both locations. Mixed and sole cropping systems did not influence the diversity of nematode community but significant differences were observed in the density of the nematode taxa encountered under the two systems. Throughout the investigation at both locations, it was observed that the mixed cropping system recorded significantly (P &lt; 0.05) lower nematode population densities in comparison to sole cropping system. It is therefore true that an agro-ecological strategy for pests and diseases control is the growing of a mixture of crops differing in their susceptibility to pests and pathogens</p>

Efeito Alelopático de Extratos Aquosos de Persea americana Mill. Sobre a Germinação e Desenvolvimento Inicial de Lactuca sativa L.

2018 ◽  
Vol 22 (3) ◽  
pp. 148
Author(s):  
Uéliton Alves De Oliveira ◽  
Alex Souza Rodrigues ◽  
Elisa Dos Santos Cardoso ◽  
Ana Aparecida Bandini Rossi
Keyword(s):  
Lactuca Sativa ◽  
Germination Percentage ◽  
Persea Americana ◽  
Allelopathic Effect ◽  
Aqueous Extracts ◽  
Water Control ◽  
Initial Development ◽  
Allelopathic Potential ◽  
Lactuca Sativa L ◽  
Randomized Design

O abacateiro é uma planta frutífera, de porte arbóreo, cultivada em diversas regiões do Brasil, sendo utilizado tanto como alimento quanto fitoterápico. Estudos recentes indicam que compostos químicos, considerados fitoterápicos, podem afetar a germinação de sementes e o desenvolvimento de plântulas. Neste contexto, objetivou-se com este estudo avaliar o efeito alelopático de extratos aquosos das folhas de Persea americana Mill (abacateiro) sobre a germinação e desenvolvimento inicial de alface (Lactuca sativa L.). O experimento foi realizado em câmara de germinação, utilizando extratos aquosos obtidos por meio de decocção e infusão, nas concentrações 4,0, 12,0 e 20,0 mg mL-1, e água destilada (controle), em delineamento inteiramente casualizado (DIC), com 4 repetições de 50 sementes cada. Para avaliar o potencial alelopático foram realizados os testes de Porcentagem de Germinação (PG), Primeira Contagem (PC), Índice de Velocidade de Germinação (IVG) e Tempo Médio de Germinação (TMG) das sementes, além do Comprimento da Parte Aérea (CPA) e Comprimento do Sistema Radicular (CSR) das plântulas da alface. Os dados obtidos foram submetidos à análise de variância pelo teste F e as médias comparadas pelo teste de Tukey a 5% de probabilidade. Os extratos interferiram, significativamente, no CPA e apresentaram interação significativa para as variáveis PC, PG e CPA, sendo que o decocto, quando comparado ao infuso, ambos na concentração 4 mg mL-1 estimulou o crescimento, diferindo estatisticamente do infuso e do controle negativo. Os resultados indicam que ambos os extratos podem ser utilizados como insumo biológico, sendo o infuso como bioherbicida e o decocto como biofertilizante. Palavras-chave: Abacateiro. Alelopatia. Metabólitos Secundários. AbstractAvocado is a fruitful, large-sized plant, grown in several regions of Brazil, used both as food and phytotherapy. Recent studies indicate that chemical compounds considered phytotherapic can affect seed germination and seedling development. In this context, the objective of this study was to evaluate the allelopathic effect of aqueous extracts of leaves of Persea americana Mill (avocado) on germination and initial development of lettuce (Lactuca sativa L.). The experiment was carried out in a germination chamber, using aqueous extracts obtained by means of decoction and infusion, at concentrations 4.0, 12.0 and 20.0 mg mL-1, and distilled water (control), in a completely randomized design (DIC), with 4 replicates of 50 seeds each. In order to evaluate the allelopathic potential, the Germination Percentage (PG), First Count (PC), Germination Speed Index (IVG) and Mean Germination Time (TMG) tests were performed in addition to the Aerial Part Length (CPA) and Root Length (CSR) of lettuce seedlings. The data were subjected to analysis of variance by the F test and the averages were compared by the Tukey test at 5% probability. The extracts interfered significantly in the CPA and presented significant interaction for the variables PC, PG and CPA, and the decoction, when compared to the infusion, in the concentration 4 mg mL-1, stimulated the growth, differing statistically from the infusion and control negative. The results indicate that both extracts can be used as biological inputs, being the infusion as bioherbicide and decoction as biofertilizer. Keywords: Avocado. Allelopathy. Secondary metabolites.

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