Efeitos da luz e temperatura na germinação de sementes de quatro espécies de plantas daninhas do gênero Digitaria

Mondo, Vitor Henrique Vaz; Carvalho, Saul Jorge Pinto de; Dias, Ana Carolina; Filho, Júlio Marcos

doi:10.1590/s0101-31222010000100015

Cited by 63 publications

(68 citation statements)

References 22 publications

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“…Biotype R germinated more than the susceptible one at temperatures between 15 and 30 o C, with or without light, with an exception observed for 25 o C in the absence of light (Figure 2). These results are consistent with those obtained by Mendonça et al (2014) and Mondo et al (2010), who have classified sourgrass seeds as preferential positive photoblastics because they do not depend on light for germination, although this one has been higher in its presence (Vázquez-Yanes and Orozco-Segovia, 1993). This characteristic is common in weed seeds because it is a species adapted to different edaphoclimatic conditions, as observed in Aegilops tauschii and Urochloa subquadripara (Teuton et al, 2004;Fang et al, 2012).…”

Section: Temperature and Lightsupporting

confidence: 92%

“…Seed germination of the R biotype was higher than that of the S biotype at all tested temperatures, except for 25/35 o C under light and 10/20 o C in the dark. Similar results were observed for other species of the genus Digitaria (Mondo et al, 2010). Apparently, germination in the dark minimizes the differences observed in germination between the R and S biotypes in the alternating temperatures.…”

Section: Temperature and Lightsupporting

confidence: 85%

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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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Section: Temperature and Lightsupporting

confidence: 92%

Section: Temperature and Lightsupporting

confidence: 85%

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

2017

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“…D. horizontalis is a widely distributed weed species, occurring in several crops (Silva & Silva, 2007). One of its particularities, however, is the demand for light in order to start the germination process (Mondo et al, 2010); thus, the shaded environment in the intercrop would greatly contribute to a lower emergence of this species.…”

Section: Phytosociologymentioning

confidence: 99%

“…Although D. horizontalis has completely disappeared from both areas, Brachiaria plantaginea was solely responsible for 75% and 52% of the Importance Value, respectively for the monocrop and intercrop systems; and G. coarctatum was also responsible for 47% of the Importance Value in the shaded, intercrop environment (Table 1). B. plantaginea occurs as a weed species in coffee plantations in Brazil (Moreira et al, 2013), demanding high light intensities for its emergence and development (Silva & Silva, 2007;Mondo et al, 2010).…”

Section: Phytosociologymentioning

confidence: 99%

Infestation of weed species in monocrop coffee or intercropped with banana, under agroecological system

et al. 2014

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-We aimed with this study to compare weed infestation in coffee under two different cropping managements: conventional coffee grown alone, or intercropped with banana plantation in a year-round basis (late spring, late summer, late fall and late winter). The experiment was installed in 2009 under field conditions at the Escola Municipal Rural Benedita Figueiró de Oliveira, in the city of Ivinhema in the state of Mato Grosso do Sul, Brazil. Assessments of weed occurrence were made three years after employment, on both cropping systems, and density, frequency, dominance and the importance value for each plant species in each system and season were quantified. Plant diversity within each system was estimated by Simpson and Shannon-Weiner indexes. Similarity between cropping systems were also assessed by the binary asymmetric similarity coefficient of Jaccard. Absolute infestation and spontaneous species differed between the two cropping systems in all seasons. Overall species diversity is higher in the monocrop compared with the intercrop, and it is associated in this study with the higher incidence of troublesome species. Areas were similar in terms of weed composition only in the Fall. Shading provided by the banana trees shows to be an efficient culture management aiming to suppress weeds in agro-ecological planting systems.Keywords: weed occurrence, intercrops, phytosociology. RESUMO -Objetivou-se com este trabalho comparar a infestação de plantas daninhas em café sob dois manejos de cultivo diferentes: café convencional cultivado isoladamente (solteiro) e em consórcio com banana (final da primavera, fim do verão, outono e final do inverno). O experimento foi instalado em 2009, em condições de campo, na Escola Municipal Rural

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“…Entre estas espécies, atualmente, uma das que apresenta ampla distribuição geográfica é o capim-amargoso, ocorrendo na maioria dos ambientes favoráveis à agricultura, desde o continente asiático ao americano (Mondo et al, 2010). Digitaria insularis possui vários nomes comuns, destacando-se os seguintes no Brasil: capimamargoso, capim-flecha, capim-açú, capimpororó e milheto-gigante.…”

Section: Introductionunclassified

Aspectos da biologia de Digitaria insularis resistente ao glyphosate e implicações para o seu controle

et al. 2012

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Resumo -O capim-amargoso (Digitaria insularis) é uma planta perene que tem a capacidade de emergir e se desenvolver praticamente o ano inteiro nas condições climáticas brasileiras. Uma vez estabelecida com a formação de rizomas, a dificuldade de controle dessa espécie aumenta muito. Com a recente confirmação da existência de biótipos resistentes à glyphosate os problemas se agravaram e o conhecimento da biologia dessa espécie é fundamental na elaboração de estratégias para o manejo químico do capim-amargoso. A presença dessa espécie deve ser monitorada nas lavouras durante a safra, safrinha e entressafra, pois o descaso com a ocorrência dessa planta na lavoura pode levar a um forte aumento na população de D. insularis e consequentemente a sérios prejuízos na produtividade e aumento nos custos de produção. Palavras-chaves: capim-amargoso, resistência, controle químico Abstract -Sourgrass (Digitaria insularis) is a perennial weed which has the ability to germinate, grow and develop during the entire year under Brazilian weather conditions. Once established with the formation of rhizomes, the difficulty of control greatly increases. With the recent confirmation of the existence of resistant biotypes to glyphosate, the problems became worse and knowledge on the biology of this species is critical to develop strategies for chemical management of sourgrass. The presence of this species should be monitored during the crop growing seasons (winter and summer) and also during off-season period, once neglecting the occurrence of this plant in the area can lead to a sharp increase in the population of Digitaria insularis and consequently to serious crop yield losses and increased production costs.

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Efeitos da luz e temperatura na germinação de sementes de quatro espécies de plantas daninhas do gênero Digitaria

Cited by 63 publications

References 22 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

Infestation of weed species in monocrop coffee or intercropped with banana, under agroecological system

Aspectos da biologia de Digitaria insularis resistente ao glyphosate e implicações para o seu controle

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