Rice seedling and plant development as affected by increasing rates of penoxsulam under controlled environments

Concenço, Germani; Lopes, Nei Fernandes; Moraes, Dário Munt de; Andrés, A.; Melo, P.T.B.S.

doi:10.1590/s0100-83582006000100017

Cited by 2 publications

(2 citation statements)

References 4 publications

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“…The average length of Allium root control was 4.67±0.08 cm, while the root length decreased up to 0.58±0.07 cm at 1000 µg/L of penoxsulam. The root length on Oryza sativa was decreased with increasing rates of penoxsulam [12]. Penoxsulam+cyhalofop butyl showed inhibitor effect on the radial mycelial growth of Rhizoctonia solani [13].…”

Section: Resultsmentioning

confidence: 99%

Cytotoxicity and Genotoxicity in Allium cepa L. Root Meristem Cells Exposed to the Herbicide Penoxsulam

Liman

Özkan

2019

Celal Bayar Üniversitesi Fen Bilimleri Dergisi

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Penoxsulam is a new sulfonamide herbicide used on rice crops for annual grasses, broadleaf weeds, and sedges control, either grown through transplanting or direct dry or direct seeding methods of planting. In this study, Allium cepa ana-telophase and comet assay were used to examine the cyto-genotoxic effects of herbicide penoxsulam on A. cepa roots. A. cepa bulbs were exposed to ½xEC50 (12.5 µg/L), EC50 (25 µg/L) and 2xEC50 (50 µg/L) concentrations of penoxsulam for 24, 48, 72 and 96 h. Distilled water and 10 ppm of methyl methanesulfonate (MMS) were used as negative and positive control groups, respectively. Penoxsulam showed a cytotoxic effect by reducing root growth and mitotic index (MI), a genotoxic effect because it statistically increased chromosome aberrations (CAs, anaphase bridge, chromosomal laggards, polyploidy, disturbed ana-telophase and stickiness) and DNA damage as compared to control. Liquid chromatography-tandem mass spectrometry (LC-MS/MS) was also used for quantitative analysis of penoxsulam in A. cepa root meristem cells. Further molecular toxicological evaluations associated in the cyto-genotoxicity of penoxsulam on plants are needed to confirm these results.

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Section: Resultsmentioning

confidence: 99%

Cytotoxicity and Genotoxicity in Allium cepa L. Root Meristem Cells Exposed to the Herbicide Penoxsulam

Liman

Özkan

2019

Celal Bayar Üniversitesi Fen Bilimleri Dergisi

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“…Concenço et al (2006), trabalhando com arroz e herbicida inibidor da ALS em ambiente controlado, verificaram redução do conteúdo de água em função da presença do herbicida somente nas raízes das plantas. Observa-se que o efeito da competição difere completamente do efeito de subdosagens de inibidores da ALS, estando relacionado a outros fatores, além da pressão de turgescência nas raízes.…”

Section: Universidade Federal De Viçosa Viçosa-mg 2007unclassified

Crescimento de raízes de biótipos de capim-arroz resistente e suscetível ao quinclorac em competição

Schuch¹,

Andrés

Freitas³

et al. 2008

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RESUMO -Objetivou-se com este trabalho avaliar o potencial competitivo de biótipos de capim-arroz resistente e suscetível ao quinclorac no ambiente do solo, como forma de inferir qual deles possui maior potencial de extração de recursos. O experimento foi instalado em casa de vegetação, constando de diferentes populações de plantas dos biótipos de capimarroz resistente (R) e suscetível (S) ao herbicida quinclorac, oriundos da região arrozeira de Itajaí/SC. Foi estabelecida uma planta do biótipo de capim-arroz considerado como tratamento, no centro da unidade experimental; na periferia, foram semeadas dez sementes do biótipo oposto ao do tratamento central, sendo posteriormente estabelecido o número de plantas de acordo com o tratamento (0, 1, 2, 3, 4 ou 5 plantas). O delineamento experimental foi o completamente casualizado, em esquema fatorial 2 x 6, com quatro repetições. Aos 40 DAE, foram avaliados o comprimento, volume, massa fresca, massa seca e conteúdo de água das raízes das plantas. Os dados obtidos foram submetidos à análise de variância e, em caso de significância, efetuou-se o teste de Duncan, para avaliar o efeito do aumento na população de plantas, e o teste da Diferença Mínima Significativa (DMS), para avaliar diferenças entre biótipo resistente e suscetível, além da matriz de correlação. A imposição de competição no ambiente das raízes pode afetar mais o biótipo resistente ao quinclorac que o suscetível, sendo esta característica essencial para a sobrevivência do biótipo, principalmente sob escassez do recurso.Palavras-chave: resistência, Echinochloa, arroz irrigado, ambiente radical.ABSTRACT -The objective of this work was to evaluate the competitive potential of Echinochloa plants resistant and susceptible to quinclorac in the soil, to evaluate whether there are potential differences in extracting nutrients from the soil. The trial was carried out under greenhouse conditions. The treatments consisted of amounts of Echinochloa plants resistant or susceptible to quinclorac. At the center of the experimental unit one plant was established and considered as the treatment; at the periphery, the number of plants of the opposite biotype was established according to the treatment (0, 1, 2, 3, 4 or 5 plants). The experimental design was completely randomized blocks in a factorial scheme 2 x 6, with four replications. Forty days after emergence, root length, volume, fresh and dry mass and water content were evaluated. Data were analyzed by the F-test at 5% probability, using the DMRT test at 5% probability for the effect of increasing density, and DMS test at 5% probability between biotypes. A correlation matrix was built between the evaluated variables. Root competition in the soil could affect more seriously the resistant biotype than the susceptible one, being this characteristic essential for biotype survival, mainly under low nutrient levels.

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Rice seedling and plant development as affected by increasing rates of penoxsulam under controlled environments

Cited by 2 publications

References 4 publications

Cytotoxicity and Genotoxicity in Allium cepa L. Root Meristem Cells Exposed to the Herbicide Penoxsulam

Cytotoxicity and Genotoxicity in Allium cepa L. Root Meristem Cells Exposed to the Herbicide Penoxsulam

Crescimento de raízes de biótipos de capim-arroz resistente e suscetível ao quinclorac em competição

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