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Planta Daninha

Print version ISSN 0100-8358

Planta daninha vol.17 no.2 Viçosa May/Aug. 1999

https://doi.org/10.1590/S0100-83581999000200001 

Efeitos de herbicidas nos teores de clorofilas de Spirodela punctata1

 

Effect of the herbicides on the chlorophyll content of Spirodela punctata

 

 

Durvalina M. M. dos SantosI; Robinson A. PitelliII; David A. BanzattoIII

IProf. Assistente Dr., Departamento de Biologia Aplicada Agropecuária, FCAV/UNESP. Rodovia Carlos Tonanni, km 5. Jaboticabal/SP. CEP: 14870-000
IIProf. Titular, Departamento de Biologia Aplicada Agropecuária, FCAV/UNESP, Jaboticabal/SP
IIIProf.Adjunto, Departamento de Ciências Exatas, FCAV/UNESP, Jaboticabal/SP

 

 


RESUMO

Com o objetivo de verificar na planta aquática Spirodela punctata o efeito de diferentes concentrações (0,005; 0,05; 0,5 e 5 mgL-1 de ingrediente ativo) dos herbicidas butachlor, glyphosate e propanil sobre os teores de clorofila a, b e na razão clorofila a/b, foram conduzidos, por sete dias completos, bioensaios em sala climatizada. Determinou-se os teores de clorofilas através de leituras espectrofotométricas nas absorbâncias A645 e A663 nm. Os resultados mostraram que o butachlor diminuiu o teor de clorofila b, o glyphosate o teor de clorofila a, enquanto o propanil diminuiu os teores de clorofila a, b e a razão a/b, provocando a maior redução de pigmentos na espécie.

Palavras chave: Pigmentos, butachlor, propanil, glyphosate, planta aquática.


ABSTRACT

Effect of the herbicides on the chlorophyll content of Spirodela punctata The aim of this study was to verify the effects of the herbicides butachlor, glyphosate and propanil on content of chlorophyll of aquatic plant Spirodela punctata. In order to determine the effect of different concentrations of 0.005; 0.05; 0.5 and 5 mgL-1 (active ingredient) of three herbicides on the contents of chlorophyll a, b and a/b ratio. The bioassays were conducted, for a period of seven full days, in a climatedcontrolled room. Chlorophyll content was determined by spectrophotometric absorbency readings at A645 and A663 nm. Butachlor reduced chlorophyll b, the glyphosate decrease chlorophyll a, while the propanil reduced chlorophyll a, b and a/b ratio, causing the greatest reduction of the pigments in the species.

Key words: Pigments, butachlor, propanil, glyphosate, aquatic plant.


 

 

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Recebido para publicação em 29/01/97 e na forma revisada em 21/09/99.

 

 

1 Parte da tese do primeiro autor apresentada para obtenção do título de Doutor.

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