Title: COMUNICAÇÃO POTENCIAL ALELOPÁTICO DE Cyperus rotundus L. SOBRE ESPÉCIES CUL TIVADAS Allelopathic potential of Cyperus rotundus L. upon cultivated species
Abstract: RESUMOMetabotitos secundarios produzidos em algumas plantas podem provocar alteracoes no desenvolvimento de outrasplantas ou ate mesmo de outros organismos. Neste trabalho, objetivou-se identificar possiveis efeitos alelopaticos de extratosaquosos de folhas de Cyperus rotundus na germinacao e no crescimento de plântulas de Brassica campestris, Brassica oleraceavar. botrytis, Brassica oleracea var. capitata, Brassica oleracea var. italica, Brassica rapa, Lactuca sativa cv. Grand rapids,Lycopersicum esculentum e Raphanus sativus. Foram utilizadas sete concentracoes do extrato aquoso (0, 10, 30, 50, 70, 90 e100%). Os tratamentos foram arranjados em delineamento inteiramente casualizado, com cinco repeticoes de dez sementes dasespecies cultivadas, constituindo a unidade amostral. Os extratos aquosos de C. rotundus evidenciaram potencialidadesalelopaticas na germinacao das sementes e no crescimento das duas partes vegetais (raiz e parte aerea), de todas as especiestestadas, exceto na germinacao de sementes de tomate e de alface, sendo que a reducao aumentou com o aumento das concentracoesdos extratos aquosos utilizados. A estrutura vegetal mais afetada em presenca dos extratos aquosos foi o sistema radicular dasplântulas.Termos para indexacao: Alelopatia, Germinacao de sementes, Crescimento.ABSTRACTSecondary metabolites produced in some plant species may promote changes in the development of other plants or even inother organisms. The aim of this work was to identify the possible allelopathic effects of aqueous extracts of Cyperus rotundus leaveson germination and growth of Brassica campestris, Brassica oleracea var. botrytis, Brassica oleracea var. capitata, Brassicaoleracea var. italica, Brassica rapa, Lactuca sativa cv. Grand rapids, Lycopersicum esculentum and Raphanus sativus seedlings.Seven aqueous extract concentrations were used (0, 10, 30, 50, 70, 90, and 100%). The treatments were arranged in a completelyrandomized desing, with five replications of ten seeds of each cultivated species constituting the sample unity. The aqueous extractsof C. rotundus revealed allelopathic potentialities on germination of seeds and growth of two vegetable parts (root and aerial part) ofall tested species, except on germination of L. sativa and L. esculentum seeds, being that the reduction increased with the increase ofthe aqueous concentration extracts which were used. The seedlings roots were the most affected structure in the presence of aqueousextracts.Index terms: Allelopathy, seed germination, growth.
Publication Year: 2009
Publication Date: 2009-01-01
Language: en
Type: article
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