Potencial alelopático de 2-benzoxazolinona (boa) e sua interação com atrazine no crescimento de plantas

Allelopathic potential of 2-benzoxazolinone (boa) and its interactions with atrazine on lant growth

Potencial alelopático de 2-benzoxazolinona (boa) e sua interação com atrazine no crescimento de plantas

Allelopathic potential of 2-benzoxazolinone (boa) and its interactions with atrazine on lant growth

Itamar F. Souza^I; Frank A. Einhellig^II

^IPesquisador, EPAMIG, Caixa Postal 176, Lavras,MG 37200-000

^IIPesquisador, University of South Dakota, Vermillion, SD, USA

RESUMO

Dois experimentos de laboratório foram conduzidos na Universidade de South Dakota, Vemillion, SD, EUA, em 1990, para determinar os efeitos do ácido hidroxâmico benzoxazolinona (BOA), do herbicida atrazine e de suas misturas sobre o crescimento e teor de clorofila de lentilha dágua (Lemna minor). BOA na concentração de 0,5 mM foi aplicado em combinação com atrazine a 0,001 e 0,005 mM em caixas plásticas com 24 células de 2,5 ml, contendo 3 frondes de lentilha dágua em solução nutritiva. BOA e atrazine, aplicados isoladamente, inibiram o número, o peso sêco e o teor de clorofila. Atrazine apresentou uma maior ação inibitória que BOA. A combinação BOA (0,05 mM) e atrazine à 0,001 mM foi antagonística. A inibição induzida pelo atrazine a 0,001 mM foi, em parte, neutralizada, porém, com a dose 0,005 mM a sua ação inibitória não foi alterada.

Palavras chave: Acido hidroxâmico, alelopatia, lentilha dágua, Lemna minor.

ABSTRACT

Two laboratoy experiments were carried out at the University of South Dakota, Vermillion, SD, USA, in 1990, to determine the effects of hydroxamic acid benzoxazolinone (BOA), the herbicide atrazine, and a mixture there of on duckweed growth and its chlorophyll content. BOA at 0.5 mM concentration was applied in combination with atrazine at 0.001 and 0.005 mM in a 2.5 ml cell tissue cluster dish containing three fronds of duckweed in nutrient solution. Single applications of BOA and atrazine inhibited duckweed frond number, frond dry weight, and its chlorophyll content. Atrazine showed stronger inbibition effect than BOA. The combination BOA and atrazine at 0.001 mM was antagonistic where the inhibition induced by the herbicide was counteracted. Unlike atrazine at 0.00I mM, BOA added to atrazine at 0,005 mM did not counteract the inhibitio caused by the herbicide.

Key words: Hydroxamic acid, allelopathy, duckweed, Lemna minor.

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LITERATURA CITADA

Recebido para publicação em 19/05/94 e na forma revisada em 27/10/94.

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Datas de Publicação

• Publicação nesta coleção
  17 Ago 2010
• Data do Fascículo
  1994

Histórico

• Aceito
  27 Out 1994
• Recebido
  19 Maio 1994