alelopathic effect of aqueous extracts of leucena (leucaena leucocephala wit) leave and fruit on germination and root growth of canafistula (peltophorum dubium spreng)/
efeito alelopático do extrato aquoso de folha e de fruto de leucena (leucaena leucocephala wit) sobre a germinação e crescimento de raiz da canafístula (peltophorum dubium spreng.)

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ID: 134265
2005
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Abstract
Nowadays exotic plants represent a big threat to biodiversity because when they are present in favorable environments, they can influence the development of native plants, as well as they can change the natural functions of the environment. Wrong management practices are some of the main factors that support the environment invasions by exotic species. Leucena (Leucaena leucocephala Wit.) is an exotic species that takes part in Itaipu Dam recuperation riparian areas. Exotic species may have allelopathic effects. The objective of this study has been to verify allelopathic effects of aqueous extracts of leucena leaves and fruits upon germination and root growth of canafistula (Peltophorum dubium Spreng.), a native species. Twelve treatments with four replications have been used, divided in two stages, six treatments each. The utilized treatments were: water, 20%, 40%, 60%, 80% and 100% extract. All the seeds were scared mechanically. The germinated seeds have been counted daily. The length of the roots has been evaluated at the third and seventh day of experiment. The fruit extract presented more allelopathic effects than the leaves extract. The roots were sensitive both to the fruits and leaves extract.

Atualmente as plantas exóticas representam uma grande ameaça à biodiversidade pois, quando presente em ambientes que lhe são favoráveis, influenciam no desenvolvimento das plantas nativas, além de alterar o funcionamento natural daquele ambiente. Práticas de manejo erradas são um dos principais fatores que favorecem a invasão do ambiente pelas espécies exóticas. A leucena (Leucaena leucocephala Wit.) é uma espécie exótica que foi introduzida na recuperação da mata ciliar da Hidrelétrica de Itaipu, e pode possuir efeitos alelopáticos. Objetivou-se neste trabalho verificar a presença de efeitos alelopáticos do extrato aquoso de folha e fruto da leucena sobre a germinação e crescimento de raiz da canafístula (Peltophorum dubium Spreng), uma espécie nativa. Utilizou-se 12 tratamentos com 4 repetições. Os tratamentos utilizados foram: água, extratos com concentração de 20%, 40%, 60%, 80% e 100%. Todas as sementes utilizadas foram previamente escarificadas mecanicamente. Realizou-se a avaliação das sementes germinadas diariamente e o comprimento das raízes no 3o e 7o dia de experimento. Nas condições realizadas, o extrato de fruto apresentou potencial alelopático superior ao extrato de folhas. As raízes se mostraram sensíveis tanto ao extrato de fruto como de folha.

Reference Key
fortes2005semina:alelopathic Use this key to autocite in the manuscript while using SciMatic Manuscript Manager or Thesis Manager
Authors ;Andréa Maria Teixeira Fortes;Cristiane Aparecida Zucareli;Valdir Zucareli;Luciani Márcia Scherer
Journal frontiers in neuroendocrinology
Year 2005
DOI
10.5433/1679-0359.2005v26n2p161
URL
http://www.uel.br/revistas/uel/index.php/semagrarias/article/view/2288
Keywords
Agriculture (General)

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