Ecophysiology of seed germination in Digitaria insularis ((L.) Fedde)

Mendonça, Giovana Soares de; Martins, Cibele Chalita; Martins, D.; Costa, Nivan B. da

doi:10.1590/s1806-66902014000400021

Cited by 33 publications

(24 citation statements)

References 11 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%

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%

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

2017

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“…Although Klein and Felippe (1991) report this species as neutral photoblastic, in recent work by Mendonça et al (2014) it was proved that it is a positive photoblastic species. Therefore, the physical barrier provided by the …”

Section: Resultsmentioning

confidence: 96%

Uso de plantas de cobertura como ferramenta na estratégia de manejo de capim-amargoso

Petter

Sulzbach²,

Silva³

et al. 2015

RBHerbicidas

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-The use of cover crops with potential to reduce the development of weeds in crops may represent an important tool in an integrated weed management. To do so, work to evaluate initial development of Digitaria insularis under cover crops residues on the soil surface was conducted in the 2014/2015 crop in a greenhouse. The experimental design was in randomized blocks in a (7x4) + 1 factorial arrangement, and the factors consisted in seven species of cover crops (Pennisetum glaucum, Crotalaria spectabilis, Fagopyrum tataricum, Urochloa brizantha cv. Piatã, Cajanus cajan, Eleusine coracana and Mucuna pruriens) and four levels of dry phytomass (4, 8, 12 and 16 Mg ha -1 ) plus the control treatment without cover crops, with four repetitions. M. pruriens, C. cajan e U. brizantha stood out in the suppression of D. insularis, and 4 Mg ha -1 of dry phytomass of these species were sufficient to promote an expressive reduction in the total number of plants emerged, germination speed index, dry phytomass of the shoots, leaf area, dry phytomass and root volume. For these species, from 8 Mg ha -1 of phytomass development of D. insularis was no longer detected. As for the other species, the control of D. insularis was efficient only with high amounts of phytomass (16 Mg ha -1 ). D. insularis was highly sensitive to the presence of residues on the soil surface, making cover crops cultivation an important tool for the integrated management of this species. Keywords: allelopathy; Digitaria insularis; mulch; weeds; resistance Resumo -O uso de espécies de cobertura com potencial para reduzir o desenvolvimento de plantas daninhas em lavouras podem representar importante ferramenta no manejo integrado de plantas daninhas. Para tanto, conduziu-se na safra 2014/2015 em casa de vegetação um trabalho objetivando avaliar desenvolvimento inicial de Digitaria insularis sob resíduos de plantas de cobertura na superfície do solo. O delineamento experimental foi em blocos casualizados em esquema fatorial (7x4) + 1, sendo os fatores constituídos por sete espécies de plantas de cobertura (Pennisetum glaucum, Crotalaria spectabilis, Fagopyrum tataricum, Urochloa brizantha cv. Piatã, Cajanus cajan, Eleusine coracana e Mucuna pruriens) e quatro níveis de fitomassa seca (4, 8, 12 e 16 Mg ha -1 ), mais o tratamento controle sem plantas de cobertura, com quatro repetições. M.

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“…Vários estudos têm demonstrado que a luz e a temperatura interferem na germinação da semente de diferentes espécies, como Calendula officinalis (Koefender et al, 2009); Blephacoralyx salicifolius (Rego et al, 2009);Piper sp. (Bergo et al, 2010;Pacheco Junior et al, 2013); Stevia rebaudiana, Salvia sclarea e Tagetes minuta (Kumar & Sharma, 2012); Ipomea grandifolia (Orzari et al, 2013); Digitaria insularis (Mendonça et al, 2014); Murdannia nudiflora (Luz et al, 2014), entre outros.…”

Section: Introductionunclassified

Germinação e vigor de sementes de chia (Salvia hispanica L. - Lamiaceae) sob diferentes temperaturas e condições de luz

Neves

Abbad

Viana

2015

Rev. bras. plantas med.

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RESUMO:A Salvia hispanica, conhecida popularmente como chia, apresenta elevada notabilidade por suas características nutricionais, sendo rica em proteínas, fibras, sais minerais e ácidos graxos, os quais podem ser responsáveis pela diminuição do risco de doenças cardiovasculares. Apesar do crescente consumo, existem poucos estudos em relação à germinação e ao vigor de suas sementes. Assim, o presente trabalho teve como objetivo avaliar os efeitos da luz e da temperatura no potencial fisiológico de sementes de chia (Salvia hispanica L.). Para tal, as sementes foram colocadas para germinar nas temperaturas constantes de 20, 25 e 30 ºC na presença e ausência de luz. Os parâmetros avaliados foram: percentagem de germinação, primeira contagem, índice de velocidade de germinação, e comprimento e massa seca das plântulas. O delineamento experimental utilizado foi inteiramente casualizado com quatro repetições de 100 sementes. Constatou-se que a germinação das sementes de chia ocorre tanto na presença quanto na ausência de luz. As sementes de chia, sem dormência, germinam melhor na temperatura constante de 20 °C.Palavras-chave: plantas medicinais, fotoblastismo, qualidade fisiológica. ABSTRACT: Germination and vigor of chia seeds (Salvia hispanica L. -Lamiaceae) under different temperatures and light conditions.The Salvia hispanica, known as chia, has high notability for its nutritional features, being rich in protein, fiber, minerals and fatty acids, which can be responsible for reducing the risk of cardiovascular diseases. Although the consumption of the seed is increasing, there are few studies about the germination and vigor of the seeds. The aim of this study was to evaluate the effects of light and temperature on the physiologic potentiality of chia seeds (Salvia hispanica L.). The seeds were sowed on paper at constant temperatures of 20, 25 and 30 ºC in the presence or absence of light. The parameters evaluated were the following: percentage of germination, first count, germination speed index, length, and dry weight of the seedlings. The experimental design used was of complete randomized plots with four replications of 100 seeds. The germination of the chia seeds occurred in the presence or absence of light. The chia seeds, without dormancy, germinated better at the constant temperature of 20 ºC.

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Ecophysiology of seed germination in Digitaria insularis ((L.) Fedde)

Cited by 33 publications

References 11 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

Uso de plantas de cobertura como ferramenta na estratégia de manejo de capim-amargoso

Germinação e vigor de sementes de chia (Salvia hispanica L. - Lamiaceae) sob diferentes temperaturas e condições de luz

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