Impacto da temperatura, irradiância e profundidade das sementes na emergência e germinação de Conyza bonariensis e Conyza canadensis resistentes ao glyphosate

Vidal, Ribas Antônio; Kalsing, Augusto; Goulart, Ives Clayton Gomes dos Reis; Lamego, Fabiane Pinto; Christoffoleti, Pedro Jacob

doi:10.1590/s0100-83582007000200010

Cited by 60 publications

(80 citation statements)

References 5 publications

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“…(Vidal et al, 2007) -in this case, mainly for low temperatures in the presence of light and for places with lower water availability, as observed in the experiments carried out.…”

Section: Emergence (%)supporting

confidence: 54%

Effects of Environmental Factors on Seed Germination and Emergence of Glyphosate Resistant and Susceptible Sourgrass

2017

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-Sourgrass is one of the most problematic weeds of Brazil. It is an aggressive species in the allocation of resources from the environment and reported to be glyphosate resistant in several states of the country. This work has aimed to verify environmental effects on seed germination and seedling emergence of sourgrass. Laboratory and field trials were conducted to determine the effects of temperature, light, photoperiod, water availability and depth of burial in germination and emergence of seeds. The maximum germination was greater than 80% for seed originated from resistant plants between 15 and 30 o C. For the susceptible ones, the maximum germination occurred only at 30 o C. Germination occurred for both biotypes independent of the presence of light. The best photoperiod for germination of both biotypes was between 8 and 14 hours. Seeds originated from resistant plants showed higher germination levels at low temperatures in the presence of light and in less water availability. There was no germination from -0,8 MPa for both biotypes. The emergence for both biotypes was low, indicating that seed burial could be used in the management of the species. Seeds from resistant plants showed higher and larger germination in temperatures, water content and depth of burial ranges than from originated from susceptible plants.Keywords: Digitaria insularis, water availability, photoperiod, seeds, temperature. RESUMO -O capim-amargoso é uma das espécies mais problemáticas da agricultura brasileira. É uma espécie agressiva na alocação de recursos do meio

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“…(Vidal et al, 2007) -in this case, mainly for low temperatures in the presence of light and for places with lower water availability, as observed in the experiments carried out.…”

Section: Emergence (%)supporting

confidence: 54%

Effects of Environmental Factors on Seed Germination and Emergence of Glyphosate Resistant and Susceptible Sourgrass

2017

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“…Luz e temperatura representam, portanto, fatores ambientais importantes para o desenvolvimento de programas de manejo dessas espécies. As espécies fotoblásticas positivas necessitam de luz para o início da germinação (Radosevich et al, 1997), bem como para viabilizar sua resposta às alterações térmicas anuais ou diárias (Vidal et al, 2007). Dentro dos limites extremos de temperatura, há a temperatura ou faixa de temperaturas na qual o processo ocorre com maior eficiência, ou seja, na qual há máxima germinação em um menor período de tempo; a temperatura ótima e as temperaturas cardeais (limites extremos), as quais correspondem à germinação zero (Carvalho e Nakagawa, 2000).…”

Section: Introductionunclassified

Germinação de Borreria densiflora var. latifolia sob condições controladas de luz e temperatura

et al. 2010

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RESUMO -A germinação é um processo fundamental na dinâmica populacional das plantas daninhas. Sendo assim, a presente pesquisa teve como objetivo analisar a interação entre temperatura e luz sobre a germinação de uma nova variedade da planta daninha vassourinhade-botão (Borreria densiflora var. latifolia), sob condições de câmara de germinação. Foi estudada a influência de cinco temperaturas (20, 25, 30 Palavras-chave: velocidade de germinação, sementes, biologia, soja, cana-de-açúcar.ABSTRACT -Germination is a fundamental process in weed population dynamics. Thus, this research aimed to evaluate the interaction between temperature and light upon the germination of a new variety of the weed vassourinha-de-botão (Borreria densiflora var. latifolia), under germination chamber conditions. The influence of five temperatures (20, 25, 30 and 35 o C constant and alternated 20-30 o C), in presence of 12h-photoperiod and constant dark conditions upon the germination was studied, under a randomized complete-block design, with four replications. Accumulated germination percentage and germination speed were evaluated, being the latter evaluated through the germination speed index. Data were submitted to analysis of variance through F test, followed by Tukey test at probability of 0.05. Germination occurred preferentially in presence of light, with significant interaction only between temperature and presence of light. We observed, thus, the positive photoblastism of this new variety of B. densiflora. The highest germination percentage occurred under the alternated temperature 20-30

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“…Among the weed management, crop rotation is an alternative to the reduction of the plant density, since it facilitates the herbicides rotation. Covering plants or predecessor crops have a potential for reduction on germination and development of the hairy fleabane, since they are positive photoblastic seeds (VIDAL et al, 2007;YAMASHITA;GUIMARÃES, 2011). The cultivation of wheat and black oats are important alternatives for reducing the hairy fleabane density, as well as reducing plant height (PAULA et al, 2011).…”

Section: Resultsmentioning

confidence: 99%

Soybean yield loss and economic thresholds due to glyphosate resistant hairy fleabane interference

2018

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The interference of glyphosate resistant hairy fleabane (Conyza bonariensis) has caused yield losses in soybean crop. Knowledge of the economic threshold is an important aspect for the economic management of resistant weeds. Because of it, the interference of the glyphosate resistant hairy fleabane density on the soybean yield loss was evaluated, as well as to estimate the economic threshold. Two experiments were conducted to verify the effect of different weed densities on the yield of two soybean cultivars (BRS Estância and BMX Turbo). Weed density ranged from 0 to 124 plants m-2. The yield of the BRS Estância decreased by 1.4% to the increase of one single plant, while for the BMX Turbo the loss was 25.9%. Soybean yield and economic threshold were lower for the BMX Turbo cultivar compared to the cultivar BRS Estância, which can be attributed to the genotype, competitive ability, weed development stage and/or environment. Increases in crop yield expectation, soybean price and herbicide efficiency reduce the economic threshold, indicating that the adoption of control measures should be taken when the weed density is low. Due to the high cost of hairy fleabane control, it is only feasible at high densities.

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Impacto da temperatura, irradiância e profundidade das sementes na emergência e germinação de Conyza bonariensis e Conyza canadensis resistentes ao glyphosate

Cited by 60 publications

References 5 publications

Effects of Environmental Factors on Seed Germination and Emergence of Glyphosate Resistant and Susceptible Sourgrass

Effects of Environmental Factors on Seed Germination and Emergence of Glyphosate Resistant and Susceptible Sourgrass

Germinação de Borreria densiflora var. latifolia sob condições controladas de luz e temperatura

Soybean yield loss and economic thresholds due to glyphosate resistant hairy fleabane interference

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