Germinação, biometria de sementes e morfologia de plântulas de Guizotia abyssinica Cass

Gordin, Carla Regina Baptista; Marques, R. F.; Masetto, Tathiana Elisa; Scalon, Silvana de Paula Quintão

doi:10.1590/s0101-31222012000400013

Cited by 22 publications

(17 citation statements)

References 14 publications

(11 reference statements)

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“…Importantly, these effects have been detected in a more drastic manner in typically smaller seeds, which is a criterion that fits the niger seeds, which are on average 4.54 mm long, 1.39 mm wide and 1.15 mm thick (Gordin et al, 2012). These seeds absorb water more rapidly, characterizing phase I of the seed hydration three-phase pattern and, after that period, also referred to as phase II, there is little or no water absorption, because the seeds cells can no longer expand, and it is possible to notice, already from this stage, the activation of metabolic processes required for embryo growth and early germination processes (Castro et al, 2004).…”

Section: Resultsmentioning

confidence: 64%

“…m -2 .s -1 ), using four replications of 50 seeds (Gordin et al, 2012). Evaluations were performed seven days after sowing, recording the germination percentage, taking into account the formation of normal seedlings (developed shoot and root system); germination first count held together with the germination test, counting the number of normal seedlings obtained on the third day after sowing, according to results obtained in preliminary tests; germination speed index, according to Maguire (1962); mean germination time, according to the formula proposed by Edmond and Drapalla (1958); and seedling length and dry matter by randomly choosing ten normal seedlings, measured with a digital caliper and dried in an oven at 65 °C for 72 hours, followed by weighing on a precision scale.…”

Section: Methodsmentioning

confidence: 99%

“…Within each individual compartment were added 40 mL of distilled water, being 100% relative humidity (Jianhua and McDonald, 1996) and the boxes were placed in the greenhouse at 41 and 45 °C for 24, 48, 72 and 96 hours. After these periods, the seeds were immersed for five minutes in 2% sodium hypochlorite, washed in distilled water and subjected to the germination test (Gordin et al, 2012), recording the germination percentage at seven days after sowing. The moisture content of the seeds was also determined (Brasil, 2009) before and after the aging period.…”

Section: Methodsmentioning

confidence: 99%

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Accelerated aging test in niger seeds

2015

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-Niger is a promising oilseed species for biodiesel production but there is no much information about the physiological potential of its seeds. Thus, the aim was to adapt the methodologies of accelerated aging test on six lots of niger seeds. The test was carried out by traditional and with saturated salt solution (20 and 40 g NaCl.100 mL -1 ) methods at 41 and 45 °C for 24, 48, 72 and 96 hours. After the decay period, the seeds were submitted to the germination test, proceeding to an evaluation on the seventh day after sowing, counting the normal seedlings percentage. A completely randomized design with four replications of 50 seeds was used and the means were compared by Tukey's test. The accelerated aging test was correlated with seedling emergence and provided lots classification in at least two levels of vigor. For the accelerated aging test, the method with 20 g NaCl.100 mL -1 at 41 °C for 24 hours is recommend. The traditional method is not suitable because it provides water content variation between samples above what is tolerable.Index terms: biodiesel, Guizotia abyssinica (L.f.) Cass., oilseed, vigor.Teste de envelhecimento acelerado em sementes de nigerRESuMo -o niger é uma espécie oleaginosa de interesse para a produção de biodiesel com poucas informações sobre o potencial fisiológico de suas sementes. Portanto, objetivou-se adequar as metodologias do teste de envelhecimento acelerado para a avaliação do vigor de seis lotes de sementes de niger. utilizaram-se os métodos tradicional e com solução saturada de sal (20 e 40 g de NaCl.100 mL -1), nas temperaturas de 41 e 45 °C por 24, 48, 72 e 96 horas. Após o período de deterioração, as sementes foram submetidas ao teste de germinação e procedeu-se a avaliação, aos sete dias após a semeadura, contabilizandose a porcentagem de plântulas normais. O delineamento experimental utilizado foi o inteiramente casualizado, com quatro repetições de 50 sementes e as médias comparadas pelo teste de Tukey. o teste de envelhecimento acelerado correlacionouse com o teste de emergência de plântulas e proporcionou a estratificação dos lotes em pelo menos dois níveis de vigor, recomendando-se o método com 20 g NaCl.100 mL -1 a 41 °C por 24 horas. o método tradicional não é recomendado por proporcionar variação do teor de água entre as amostras, superior ao tolerável.Termos para indexação: biodiesel, Guizotia abyssinica (L.f.) Cass., oleaginosa, vigor.

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Section: Resultsmentioning

confidence: 64%

Section: Methodsmentioning

confidence: 99%

Section: Methodsmentioning

confidence: 99%

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Accelerated aging test in niger seeds

2015

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“…Oleaginous plants have been introduced as winter crops in Brazil, especially in the CentralWest region of the country, in areas previously under fallow; thus, niger ranging from 30% to 40% in oil content (Ghane et al, 2012;Ramadan 2012) has a great potential to be cultivated in this region (Gordin et al, 2012). The oil from niger seeds can be used for several industrial purposes, such as making soaps, paints, and lubricants, and can also be used as raw material in biodiesel production.…”

Section: Introductionmentioning

confidence: 99%

Drying Kinetics of Niger Seeds

et al. 2017

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ABSTRACT:The objectives of this study were to describe the process of drying niger seeds through the fitting of different mathematical models to the experimental drying data, to select the best model that represents the phenomenon, and to determine the diffusion coefficients and thermodynamic properties of the product. Seeds with an initial moisture content of 0. , and 80ºC in a fixed bed experimental dryer. After drying, different mathematical models were fitted to determine the diffusion coefficient by applying liquid diffusion theory, which allowed for calculation of the energy activation, enthalpy, entropy, and Gibbs free energy values. The Page model was selected to represent the drying process of niger seed drying, as it is a traditional and simple model. The effective diffusion coefficient increased as the temperature increased. The activation energy for liquid diffusion at the temperature range of 40 o C to 80ºC was 46.83 kJ mol -1 . The enthalpy and entropy specific values decreased as the drying air temperature increased. The Gibbs free energy values also increased as the drying air temperature increased.

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“…Conhecer sobre a germinação de sementes de uma espécie é essencial para entender sua forma de propagação, desenvolver estratégias para fomentar a silvicultura e a conservação (BUSATTO et al, 2013;SILVA et al, 2016), e observar a influencia dos fatores ambientais nos processos fisiológicos e morfológicos do embrião e da plântula (GORDIN et al 2012).…”

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BIOMETRIA DE CACHOS, FRUTOS E SEMENTES E GERMINAÇÃO DE JACIARANA (Syagrus sancona H. Karsten. ARECACEAE).

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2017

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RESUMOA jaciarana (Syagrus sancona) é uma palmeira com ampla distribuição ao norte, oeste e sul da região Amazônica. No Acre ela ocorre em florestas primárias, secundárias e áreas de pastagens. Seus frutos são oleaginosos e em cultivo ela produz anualmente até 19 toneladas/frutos/hectares. Diante disso, neste estudo avaliaram-se parâmetros biométricos de cachos, frutos e sementes, e a germinação de sementes de S. sancona. Os resultados mostram cachos com 131,8 cm de comprimento médio e peso médio de 13,1 kg. A média de frutos/cacho foi 1.258 e a quantidade média de raquilas 164. A despeito do emprego de diferentes tratamentos para a quebra de possível dormência, foi observado um baixo porcentual na germinação e um tempo médio de germinação elevado (113 dias), dentro do esperado para as espécies de palmeiras, que usualmente superam os 100 dias. A duração da emergência de plântulas também se mostrou lenta, pois passados quase oito meses da semeadura, ela ainda estava acontecendo. Dos tratamentos avaliados, a imersão das sementes em água por 24 e 72 horas, respectivamente, assim como a escarificação dos frutos para a remoção da película protetora do poro germinativo resultaram em maiores percentuais de emergência de plântulas. Diante da escassez na literatura científica de estudos abordando a biometria e outros aspectos relacionados com a propagação de espécies do gênero Syagrus, pode-se inferir que o desenvolvimento de sistemas de propagação vegetativo eficientes para S. sancona demandará um intenso esforço de pesquisa. PALAVRAS-CHAVE: Amazônia, Propagação, Sementes Florestais. BIOMETRY OF BUNCHES, FRUIT AND SEEDS AND GERMINATION OF JACIARANA (Syagrus sancona H. Karsten, ARECACEAE).ABSTRACT The jaciarana (Syagrus sancona) is a palm tree widely distributed to the north, west and south of the Amazon region. In Acre it occurs in primary and secondary forests, and pasture areas. Its fruits are oleaginous and in cultivation it produces annually up to 19 tons/fruits/hectares. In this study, the biometric characteristics of the bunches, fruits and seeds, and the germination of S. sancona seeds were evaluated. The

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Germinação, biometria de sementes e morfologia de plântulas de Guizotia abyssinica Cass

Cited by 22 publications

References 14 publications

Accelerated aging test in niger seeds

Accelerated aging test in niger seeds

Drying Kinetics of Niger Seeds

BIOMETRIA DE CACHOS, FRUTOS E SEMENTES E GERMINAÇÃO DE JACIARANA (Syagrus sancona H. Karsten. ARECACEAE).

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