atividade alelopática de folhas e pseudofrutos de hovenia dulcis thunb. (rhamnaceae) sobre a germinação de lactuca sativa l. (asteraceae) allelopathic activity of hovenia dulcis thunb. (rhamnaceae) leaves and pseudofruits on the germination of lactuca sativa l. (asteraceae)

Clicks: 303
ID: 159712
2011
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Abstract
Neste trabalho, objetivou-se avaliar o efeito alelopático de folhas secas e pseudofrutos de Hovenia dulcis Thunb. sobre sementes de alface. Para isso, prepararam-se extratos aquosos de folhas e pseudofrutos nas concentrações 1, 2 e 4% (m/v). Realizou-se quatro repetições de 25 sementes de alface, distribuídas em placas de Petri forradas com papel Germitest e umedecidas com os extratos, mantidas em câmara de germinação à temperatura de 25°C, fotoperíodo constante e presença de luz por cinco dias, sendo o controle água destilada. Calculou-se a porcentagem, a velocidade, o índice de velocidade de germinação, o comprimento radicular e da parte aérea das plântulas, bem como o efeito das sementes na presença de diferentes soluções de pH. Observou-se que as plântulas foram significativamente afetadas na presença de extratos aquosos de folhas secas e pseudofrutos nas concentrações 2 e 4%. Os efeitos foram desvinculados do pH e potencial osmótico, indicando, portanto, interferência alelopática dos extratos obtidos de Hovenia dulcis.
This paper aims to evaluate the allelopathic effect of dry leaves and pseudofruits of Hovenia dulcis Thunb. on lettuce seeds. Therefore, aqueous extracts of leaves and pseudofruits were prepared in 1%, 2% and 4% (m/v) concentrations. Four replicates were done of 25 lettuce seeds distributed in Petri dishes lined with Germitest paper and humidified with the extracts, maintained in germination chamber at 25 °C, constant photoperiod and light presence for five days, the control being distilled water. The percentage, speed, germination rate index, root length and aerial-part length of the seedlings were calculated, as well as the seeds effect in the presence of different pH solutions. It was observed that the seedlings were significantly affected in the presence of aqueous extracts of dry leaves and pseudofruits at 2% and 4% concentrations. The effects were not linked to pH and osmotic potential, indicating, therefore, allelopathic interference of Hovenia dulcis extracts.
Reference Key
wandscheer2011actaatividade Use this key to autocite in the manuscript while using SciMatic Manuscript Manager or Thesis Manager
Authors ;Alana Cristina Dorneles Wandscheer;Junior Borella;Luziana Cassol Bonatti;Lindamir Hernandez Pastorini
Journal monatshefte für chemie chemical monthly
Year 2011
DOI
10.1590/S0102-33062011000100005
URL
http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0102-33062011000100005
Keywords
lettuce allelopathy

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