Superação de dormência em sementes de três espécies de Ipomoea

Pazuch, Daiana; Trezzi, Michelangelo Müzell; Diesel, Francielli; Barancelli, Marcos Vinícius Jaeger; Batistel, Sorhaila Camila; Pasini, Renato

doi:10.1590/0103-8478cr20120665

Cited by 17 publications

(16 citation statements)

References 10 publications

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“…The Ipomoea seeds were purchased from Agrocosmos Ag Company (São Paulo, Brazil) and multiplied on the field in the years prior to the use. The dormancy of Ipomoea grandifolia seeds was overcome according to the method described by Pazuch et al (2015). Afterwards, the Ipomoea seeds were sown manually on the field using 3 times the amount of seed needed for each density and excess seedlings were removed approximately 10 days after their emergence.…”

Section: Methodsmentioning

confidence: 99%

Morning glory species interference on the development and yield of soybeans

et al. 2017

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Section: Methodsmentioning

confidence: 99%

Morning glory species interference on the development and yield of soybeans

et al. 2017

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“…Dormancy is a phenomenon in which seeds do not germinate, even though they are viable and have all favorable environmental conditions to begin the germination process (Azania et al, 2009;Gama et al, 2011). This phenomenon assures the survival of the species under adverse conditions after the maturation and dispersion of the seeds, allowing the germination to occur with time (Pazuch et al, 2015). Several causes may be related to dormancy, such as tegument impermeability, physiological immaturity of the embryo, presence of inhibiting substances, dormant embryo, in addition to the combination of such factors.…”

Section: Introductionmentioning

confidence: 99%

“…Several causes may be related to dormancy, such as tegument impermeability, physiological immaturity of the embryo, presence of inhibiting substances, dormant embryo, in addition to the combination of such factors. The same species may present more than one cause for its dormancy (Vivian et al, 2008;Pazuch et al, 2015).…”

Section: Introductionmentioning

confidence: 99%

Germination of Echium plantagineum L. seeds submitted to dormancy overcoming and variations in temperature, light and depth of sowing

et al. 2017

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-The objective of this study was to evaluate methods of overcoming dormancy, light regimens, temperature and depth of sowing variations in the physiological quality of Echium plantagineum seeds. The diaspores (agglutinated fruits from the seeds) were submitted to treatments using accelerated aging, potassium nitrate and gibberellic acid to overcome dormancy. A 7 x 2 factorial design was used to evaluate the temperatures (5, 10, 15, 20, 25, 30 and 35 °C) and light regimens (presence or absence of light). A 6 x 2 factorial design was used for sowing depth (0, 1, 2, 3, 4 and 5 cm) and soil coverage (presence or absence of straw). In all experiments, a completely randomized design with four replicates of 50 diaspores was used. The main evaluations were germination, first germination count, germination speed index and emergence. The seeds showed dormancy, which was overcome by the immersion of the diaspores in potassium nitrate and gibberellic acid. The ideal temperature for germination was 20 °C, showing greater germination in the presence of light, considered as preferentially positively photoblastic. The highest germination percentage occurred when the diaspores were positioned on the soil surface in the presence of straw.Index terms: gibberellic acid, purple flower, photoblastism, potassium nitrate, straw. Germinação de sementes de Echium plantagineum L. submetidas à superaçãoda dormência e variações na temperatura, luz e profundidade de semeadura RESUMO -Objetivou-se avaliar métodos de superação da dormência, regimes de luz, variações da temperatura e profundidade de semeadura na qualidade fisiológica de sementes de Echium plantagineum. Para isso, os diásporos (fruto concrescido das sementes) foram submetidos a tratamentos utilizando envelhecimento acelerado, nitrato de potássio e ácido giberélico para a superação da dormência. Utilizou-se um fatorial 7 x 2 para avaliar temperaturas (5, 10, 15, 20, 25, 30 e 35 °C) e regimes de luz (presença ou ausência). Já para profundidade de semeadura (0, 1, 2, 3, 4 e 5 cm) e cobertura de solo (presença ou ausência de palha) utilizou-se um fatorial 6 x 2. Em todos os experimentos foi adotado o delineamento inteiramente casualizado com quatro repetições de 50 diásporos. As principais avaliações realizadas foram germinação, primeira contagem de germinação, índice de velocidade de germinação e emergência. As sementes apresentam dormência, sendo superada pela imersão dos diásporos em nitrato de potássio e ácido giberélico. A temperatura ideal para a germinação foi 20 °C, apresentando maior germinação na presença de luz, sendo consideradas fotoblásticas positiva preferencial. A maior porcentagem de germinação ocorreu quando os diásporos foram posicionados na superfície do solo, na presença de palha.Termos para indexação: ácido giberélico, flor roxa, fotoblastismo, nitrato de potássio, palha.

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“…Seeds underwent treatments to overcome dormancy, with hot water at 98 o C for I. grandifolia biotypes and with concentrated sulphuric acid (98%) for I. purpurea and I. indivisa ones (Pazuch et al, 2015); after that, five seeds were planted per each biotype, leaving three plants per pot after thinning. The plants remained in a greenhouse with temperature control system (10 o C minimum and 31 o C maximum), cooling and automatic irrigation, with approximately 3 mm day -1 drip irrigation, until they presented two pairs of real leaves; subsequently, the pots were transferred to the fenced field area, containing a sprinkle irrigation system.…”

Section: Methodsmentioning

confidence: 99%

Evolution of Natural Resistance to Glyphosate in Morning Glory Populations

et al. 2017

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-Tolerance, also referred to as natural resistance, is a feature that exists in the plant even before herbicide application in an area. I. grandifolia, I. indivisa and I. purpurea are among the tolerant species most commonly found over fields in southern Brazil. We hypothesized that the intensive use of glyphosate results in increasing levels of tolerance to glyphosate, and in pronounced response variability in populations of the same Ipomoea species. This study aimed at identifying tolerance variations to glyphosate among I. grandifolia, I. indivisa and I. purpurea morning glory species and among populations of these species. In crops over Paraná and Santa Catarina states (Brazil) 31 biotypes were collected (20 I. grandifolia, 7 I. indivisa and 4 I. purpurea), on which were applied 0, 216, 432, 864, 1,296, 1,728 and 2,160 g a.e. ha -1 of glyphosate and the dose required to reduce 50% of dry matter (GR 50 ) was determined. Biotypes of all tested Ipomoea species showed variability of glyphosate tolerance. Tolerance factors had greater amplitude among biotypes of I. gradifolia and I. indivisa species (between 1.7 and 33.6 and between 3.3 and 34.2, respectively) than in I. purpurea (between 3.7 and 4.9). Especially within I. gradifolia e I. indivisa species, some biotypes required a much higher dose than the recommended one to control the wild biotype, indicating progress in the level of glyphosate tolerance; this proves the initial hypothesis of this work. Keywords

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Superação de dormência em sementes de três espécies de Ipomoea

Abstract: RESUMO O conhecimento do método de superação de dormência mais adequado para cada espécie auxilia na identificação do tipo de dormência, bem como na definição de estratégias de manejo que permitam o controle mais eficaz. As espécies do gênero

Cited by 17 publications

References 10 publications

Morning glory species interference on the development and yield of soybeans

Morning glory species interference on the development and yield of soybeans

Germination of Echium plantagineum L. seeds submitted to dormancy overcoming and variations in temperature, light and depth of sowing

Evolution of Natural Resistance to Glyphosate in Morning Glory Populations

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