SciELO - Scientific Electronic Library Online

vol.12 issue2Monthly emergence of six weeds in cultived and undisturbed soilWeed interference in peanut: effects of row spacing, cultivars and weeding period author indexsubject indexarticles search
Home Pagealphabetic serial listing  

Services on Demand




Related links


Planta Daninha

Print version ISSN 0100-8358

Planta daninha vol.12 no.2 Viçosa  1994 

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. SouzaI; Frank A. EinhelligII

IPesquisador, EPAMIG, Caixa Postal 176, Lavras,MG 37200-000
IIPesquisador, University of South Dakota, Vermillion, SD, USA



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.


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.



Texto completo disponível apenas em PDF.

Full text available only in PDF format.




ARGANDONA, VA; LUZA, JG.; NIEMEYER, HM; CORCUERA, LJ. Role of hydroxamic acids in the resistance of cereals to aphids. Phytochemistry, v.19, p.1665-1668, 1980.         [ Links ]

BARNES, JP; PUTNAM, AR. Role of benzoxazinones in allelopathy by rye (Secale cereale). Journal of Chemical Ecology, v.13, p.889-906, 1987.         [ Links ]

CORCUERA, LJ; WOODWARD, MD; HELGESON, JP; KELMAN, A; UPPER, CD. 2,4-dihydroxy-7- methoxy-2H-1,4-benzoxazin-3(4H)-one, an inhibitor from Zea mays with differential activity against soft rotting Erwinia species. Plant Physiology, v.61, p.791- 795, 1978.         [ Links ]

EINHELLIG, FA; LEATHER, GE; HOBBS, LL. Use of Lemna minor as a bioassay in allelopathy. Journal of chemical Ecology, v.11, p.65-72, 1985.         [ Links ]

HAMILTON, RH. Tolerance of several grass species to 2-chloro-s-triazine herbicides in relation to degradation and content of benzoxazinone derivatives. Journal of Agriculture and Food Chemistry, v.12, p.14-17, 1964.         [ Links ]

HILLMAN, WS. Experimental control of flowering in Lemna.III: A relationship between medium composition and the opposite photoperiodic response ofL. Perpusilla 6746 and L. gibba G3. American Journal of Botany, v.48, p.413-419, 1961.         [ Links ]

KNUDSON, LL; TIBBITTS, TW; EDWARDS, GE. Measurement of ozone injury by determination of leaf chlorophyll concentration. Plant Physiology, v.60, p.606-608, 1977.         [ Links ]

LONG, BJ; DUNN, GM; ROUTLEY, DG. Rapid procedure for estimating cyclic hydroxamate (DIMBOA) concentration in maize. Crop Science, v.14, p.601-603, 1974.         [ Links ]

LOOMIS, RS; BECK, SD; STAUFFER, JR. The European corn borer (Pyransta nubilatis) and its principal host plant. V: A chemical study of host-plant resistance. Plant Physiology, v32, p379-385, 1957.         [ Links ]

NAIR, JG; WHITENACK, CJ; PUTNAM, AR. 2,2-oxo-1,1-azobenzene: A microbially transformed allelochemical from 2,3-benzoxazolinone. Journal of Chemical Ecology, v.16, p.353-364, 1990.         [ Links ]

NIEMEYER, HM. Review article number 39: Hydroxamic acids (4 -hydroxy-1,4-benzoxazin-3-ones) difference chemicals in the Gramineae. Phytochemistry, v.27, p.3349-3358, 1988.         [ Links ]

QUIROZ, A. Behavio ur of 4-hydroxy-1,4-benzoxazin-3-ones in strong acid media. Chemical Interactions Between Organisms, IFS Workshop, November 12-17, 1989, Universidad de Chile,1989.         [ Links ]

TIPTON, CL; BUELL, E. Ferric iron complexes of hydroxamic acids from maize. Phytochemistry, v.9, p.1215-1217, 1970.         [ Links ]

VENTS, JA; WATSON, PJ. Naturally occurring modifiers of auxin-receptor interaction in corn: identification as benzoxazolinones. Planta, v.103, p.103-107, 1978.         [ Links ]

VIRTANEM, AI; HIETALA, PK. Precursors of benzoxazolinone in rye plants. I: Precursor II, the aglicone. Acta of Chemical Scandinavian, v.14, p.499-502, 1960.
WINTERMANS, JFGM; DeMOTTS, A. Spectro-photometry characteristics of chlorophylls a and band their pheophytins in ethanol. Biochemical and Biophysical Acta, v.109, p.446-453, 1965.         [ Links ]

WOODWARD, JD; CORCUERA, LJ; HELGESON, JP; KELMAN, JP; UPPER, CD. Factors that influence the activity of 2,4-dihydroxy-7-methoxy-2H-1,4-benzoxazin-3(3H)-one on Erwinia species in plants. Plant Physiology, v.61, p.803-805, 1978.         [ Links ]

ZUNIGA, GE; ARGANDONA, VJ; NIEMEYER, JM; CORCUERA, LJ. Hydroxamic acid content in wild and cultivated Gramineae. Phytochernistry, v.22, p.2665-2666, 1983.         [ Links ]



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


Creative Commons License All the contents of this journal, except where otherwise noted, is licensed under a Creative Commons Attribution License