Allelopathy

doi:10.1007/978-94-011-2376-1

Cited by 83 publications

(5 citation statements)

References 253 publications

(332 reference statements)

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“…Differences in results of different studies may be due to different experimental conditions, extract concentrations and test plants they used. The increase in dry biomass of wheat seedlings treated with root and stem peel extract in the current study may probably be due to increase in photosynthetic rate and greater accumulation of photoassimilate in the shoot, increase in thickness and length of seminal root, decrease in proline content and greater potassium ion uptake induced by allelopathic extracts of S. officinale; as in earlier studies some authors argued that botanical extracts could have positive influence on these phenomena thus stimulating biomass of the receptor plant (Rizvi and Rizvi, 1992;Gatti et al, 2010;Ibrahim et al, 2013). Similarly, reduced biomass, seminal root and shoot length under leaf extract suggests the presence of phenolic and growth inhibitory compounds in leaves of sugarcane and these reductions may be regarded as a result of induced oxidative damage and activation of cellular anti-oxidant systems which in turn changed permeability patterns of cell membrane, irregularities in mineral and ion uptake and the activation of stress enzymes (Oracz et al, 2007;Khaliq et al, 2012).…”

Section: Discussionsupporting

confidence: 75%

In vitro allelopathic effect of aqueous extracts of sugarcane on germination parameters of wheat

Majeed¹,

Muhammad

Hussain

et al. 2017

AAS

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Allelopathy -interactions among plants for resources along with competition -is a composite phenomenon which has spacious potentials of application in agriculture. Understanding of interactions among plants, particularly cultivated crops, may be helpful in modifying crop cultivation pattern with consequent yields increments. In this study, we investigated the allelopathic effects of aqueous extracts of root, stem peels and leaves of sugarcane (Saccharum officinale L.) cultivar 51 at concentrations 0, 2.5, 5.0, 7.5 and 10.0 g/l on germination indices and seedling biomass of wheat (Triticum aestivum L.) cultivar Pirsabak-2005. Results demonstrated that higher concentration (10.0 g/l) of extracts of root, stem peels and leaves significantly decreased mean germination time (MGT) but increased shoot and seminal root growth and seedling dry biomass; however, germination percentage was affected neither by extract concentration nor by plant parts used in the study. Extract concentrations up to 7.5 g/l had no effect on the studied parameters of wheat. Our result suggests that sugarcane's allelopathy demonstrates healthy effects on wheat growth and that wheat could be cultivated in sequential rotation in field conditions. Key words: allelopathy; sugar cane; common wheat; germination parameters; biomass; crop rotation IZVLEČEK In vitro ALELOPATSKI UČINKI VODNIH IZVLEČKOV SLADKORNEGA TRSA NA PARAMETRE KALITVE NAVADNE PŠENICEAlelopatija -interakcije med rastlinami za vire preko tekmovanja -je kompleksen fenomen, ki ima za uporabo v kmetijstvu velik pomen. Razumevanje teh interakcij med rastlinami, še posebej med gojenimi, lahko pomaga pri spreminjanju načinov pridelave z znatnim povečanjem pridelka. V raziskavi so bili preučevani alelopatski učinki vodnih izvlečkov korenin, stebel in listov sladkornega trsa (Saccharum officinale L.), kultivarja 51, v koncentracijah 0, 2.5, 5.0, 7.5 in 10.0 g/l na kalitvene parametere in biomaso kalic krušne pšenice (Triticum aestivum L.), sorte Pirsabak-2005. Rezultati so pokazali, da so večje koncentracije (10.0 g/l) izvlečkov korenin, stebla in listov značilno zmanjšale povprečni čas kalitve (MGT), a povečale rast semenskih korenin in poganjkov ter biomaso kalic, na odstotek kalitve pa niti koncentracija izvlečkov niti rastlinski organ nista vplivala. Izvlečki v koncentracijah do 7.5 g/l niso imeli učinka na preučevane parametre pšenice. Rezultati nakazujejo, da ima sladkorni trs pozitivne alelopatske učinke na rast pšenice in da lahko poljščino gojimo v kolobarju neposredno za sladkornim trsom.

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Section: Discussionsupporting

confidence: 75%

In vitro allelopathic effect of aqueous extracts of sugarcane on germination parameters of wheat

Majeed¹,

Muhammad

Hussain

et al. 2017

AAS

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“…In addition to germinability, germination rate, homogeneity and synchrony are factors that show the level of organisation or disorder in the chemical reactions of the germination process (Ferreira, 2004;Santana et al, 2006). Changes in germination parameters can result from the effects of several physiological processes: membrane permeability, DNA transcription and translation, second messengers function, respiration, enzymes and receptors conformation (Ferreira, 2004;Rizvi and Rizvi, 1992). Slower germination plants can present reduced size (Jefferson and Pennacchio, 2003), leading to greater susceptibility to stress and less chances in resource competition.…”

Section: Discussionmentioning

confidence: 99%

Seasonality effect on the allelopathy of cerrado species

et al. 2014

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The Brazilian cerrado presents strong climate seasonality. During the dry season, plants may be exposed to stressful situations, such as a soil surface water deficit, that stimulate their chemical defenses. However, the seasonality effect on the production of allelopathic compounds of cerrado plant species is poorly understood. In this study, the phytotoxic activities of common native cerrado plants were evaluated during rainy and dry seasons. Crude leaves extracts (10% concentration: weight/volume, with dry leaves and distilled water) from eleven species were tested on lettuce and sesame germination. The negative effects on germination percentages, rates and informational entropies of the target species were higher when submitted to plant extracts from the dry season, where the germination rate was the most sensible parameter. The higher sensibility of lettuce and the germination rate parameter showed this difference. Only two exceptions had higher effects for rainy season extracts; one species showed higher negative effects on germination informational entropy of lettuce and another species on the germination rate of sesame. Thus, increases in the allelopathic activity were seen in the majority of the studied cerrado plant species during the dry season. These distinct responses to stressful situations in a complex environment such as the Brazilian cerrado may support the establishment and survival of some species.Keywords: chemical ecology, phytotoxicity, secondary metabolites. Efeito da sazonalidade sobre a alelopatia de espécies de cerradoResumo O cerrado brasileiro apresenta forte sazonalidade climática. Durante a estação seca as plantas podem estar expostas a situações estressantes, tais como um déficit de umidade nas camadas superficiais do solo, que estimulam suas defesas químicas. No entanto, o efeito da sazonalidade na produção de compostos alelopáticos de espécies vegetais de cerrado é pouco conhecido. Neste estudo, as atividades fitotóxicas de plantas nativas comuns de cerrado foram avaliadas durante as estações chuvosa e seca. Extratos brutos de folhas (concentração 10%: peso/volume, com folhas secas e água destilada) de onze espécies foram testados sobre a germinação de alface e gergelim. Os efeitos negativos sobre as porcentagens de germinação, velocidades e entropias informacionais das espécies-alvo foram maiores quando submetidas a extratos vegetais da estação seca. A maior sensibilidade da alface e do parâmetro velocidade de germinação mostraram essa diferença. Apenas duas exceções tiveram maiores efeitos para extratos da estação chuvosa; uma espécie mostrou maiores efeitos negativos sobre a entropia informacional de germinação de alface e outra espécie sobre a velocidade de germinação de gergelim. Assim, aumentos na atividade alelopática foram vistos na maioria das espécies vegetais do cerrado estudadas durante a estação seca. Estas respostas distintas a situações estressantes em um ambiente complexo como o cerrado brasileiro podem auxiliar no estabelecimento e na sobrevivência de algu...

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“…These interactions may be indirect, when the allelopathic compounds change soil properties, or direct, when these substances interfere in the plant metabolism (FERREIRA and AQÜILA, 2000). The allelochemicals can affect the cellular ultrastructure, concentration and hormonal balance, membrane permeability affecting the uptake of ions, stomatal opening influencing photosynthesis, pigment and protein synthesis, enzyme activity, water relations, sap flow and genetic material (RIZVI and RIZVI, 1992;INDERJIT and CALLAWAY, 2003;INDERJIT et al, 2006).…”

Section: Introductionmentioning

confidence: 99%

Evaluation of allelopathic potential of leaf extract of Kielmeyera coriacea on Lactuca sativa L

et al. 2015

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Kielmeyera coriacea Mart. (Clusiaceae), popularly known as "pau-santo", is a typical Brazilian cerrado tree known due to its varied secondary metabolites. This study aimed to determine the allelopathic potential of the hydroalcoholic extract of leaves of K. coriacea through bioassays of seed germination, seedling growth and mitotic index of Lactuca sativa L. (lettuce). In addition it was done the tetrazolium assay and a phytochemical screening. The extract concentrations caused alterations in germination parameters, in root growth and in the mitotic index. The phytochemical screening showed the presence of triterpenes, coumarins, steroids, flavonoids and condensed tannins, compounds known to confer allelopathic characteristics upon other species. These data indicate that K. coriacea presents an allelopathic potential because its leaf extracts interfere with germination and growth without any interference of pH and osmotic potential in the results.

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Allelopathy

Cited by 83 publications

References 253 publications

In vitro allelopathic effect of aqueous extracts of sugarcane on germination parameters of wheat

In vitro allelopathic effect of aqueous extracts of sugarcane on germination parameters of wheat

Seasonality effect on the allelopathy of cerrado species

Evaluation of allelopathic potential of leaf extract of Kielmeyera coriacea on Lactuca sativa L

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