Tratamento térmico para superação da dormência em sementes de Stylosanthes SW. (fabaceae papilionoideae)

Alencar, Karina Margareti de Castilio; Laura, Valdemir Antônio; Simeão, Rosângela Maria

doi:10.1590/s0101-31222009000200019

Cited by 13 publications

(9 citation statements)

References 8 publications

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“…The results obtained for the GSI were similar to the ones found in the final germination percentage (Figure 2), as opposed to the work carried out by Alencar et al (2009) with the Stylosanthes capitata SW. species, in which the 50 °C temperature had no significant effect on germination and on GSI, and the GSI was 2.33 when seeds were submitted to the 60 °C/10 h temperature and Martins-Corder et al (1999) also found that immersion in hot water at a temperature of 80 °C (T 4 ) and seed immersion in water at 80 °C until cooling to room temperature (28 °C) (T 5 ); seed immersion in water at 100 °C for 10 (T 6 ), 30 (T 7 ), 60 seconds (T 8 ) and seed immersion in water at 100 °C until cooling to room temperature (28 °C) (T 9 ). Means followed by the same letter do not differ by the Scott-Knott test at 5% level of probability.…”

Section: Resultssupporting

confidence: 82%

“…However, on species that have dormancy should be developed more specific studies (Barbosa et al, 2004) as performed by Alencar et al (2009) with the species Stylosanthes macrocephala M. B. Ferreira & S. Costae, where the most effective treatment to break dormancy is to submit seed to oven at 60 °C for 15 hours, while the most recommended seeds of Stylosanthes capitata Vogel, the temperature was 70 °C. For seeds Vachellia farnesiana (L.) Wight & Arn.…”

Section: Introductionmentioning

confidence: 99%

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Thermal scarification to overcome Piptadenia moniliformis seeds dormancy

Ferreira

Matos

Silva

et al. 2014

Agraria

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This study aimed to evaluate the performance of different thermal scarification methods to overcome Piptadenia moniliformis seeds dormancy. The thermal treatments used were: control (no treatment -T 1 ); seed immersion in water at 80 and 100 °C for 10 (T 2 and T 6 , respectively), 30 (T 3 and T 7 , respectively) and 60 (T 4 and T 8 , respectively) seconds; seed immersion in water at 80 °C until cooling to room temperature (28 °C) (T 5 ), and seed immersion in water at 100 °C until cooling to room temperature (28 °C) (T 9 ). The seeds were placed for germination in boxes with transparent lid, containing the blotting paper substrate, which was moistened with Nystatin solution. Later, they were placed in a Biochemical Oxygen Demand germinator, regulated at 30 °C under continuous light. The following parameters were evaluated: first germination counting; final germination; germination speed index; root and shoot length; and root and shoot dry mass. The thermal scarification using seed immersion in water at 80 °C for 10 and 30 seconds was efficient in overcoming dormancy in Piptadenia moniliformis seeds, presenting the highest germination and vigor percentage. Key words: forest species, germination, vigorEscarificação térmica para superação da dormência de sementes de Piptadenia moniliformis RESUMO O presente trabalho propôs avaliar o desempenho de diferentes métodos de escarificação térmica para superação da dormência de sementes de Piptadenia moniliformis. Os tratamentos térmicos utilizados foram: testemunha (sementes intactas -T 1 ); imersão das sementes em água a 80 e 100°C por 10 (T 2 e T 6 , respectivamente), 30 (T 3 e T 7 , respectivamente) e 60 segundos (T 4 e T 8 , respectivamente), imersão das sementes em água a 80°C até resfriamento em temperatura ambiente (28°C) (T 5 ) e imersão das sementes em água a 100°C até resfriamento a temperatura ambiente (28°C) (T 9 ). Para avaliação do efeito dos tratamentos foram determinados a contagem de germinação inicial, germinação final e índice de velocidade de germinação, tal como o comprimento e a massa seca da raiz e parte aérea. A imersão das sementes em água a 80°C por 10 e 30 segundos é eficiente na superação da dormência das sementes de Piptadenia moniliformis.Palavras-chave: espécie florestal, germinação, vigor

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Section: Resultssupporting

confidence: 82%

Section: Introductionmentioning

confidence: 99%

Thermal scarification to overcome Piptadenia moniliformis seeds dormancy

Ferreira

Matos

Silva

et al. 2014

Agraria

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“…Copaifera langsdorffii is a common tree species in tropical forest environments (Carvalho 2003), and fire tolerance may be an attribute important for the occurrence of this species in the Cerrado (Rizzini 1976). Seeds of C. langsdorffii tolerate high temperatures, and the germination percentage increases after the passage of fire, which can be attributed to the control of microorganisms, such as fungi (Alencar et al 2009). In fact, in our study, the seeds treated with fire had a low level of infestation by fungi.…”

Section: Discussionmentioning

confidence: 99%

Key factors affecting seed germination of Copaifera langsdorffii, a Neotropical tree

et al. 2015

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In natural conditions biotic and abiotic factors interact, synergistically affecting seed germination. In this study, we experimentally simulated natural conditions that occur during seed dispersal that can affect the germination of Copaifera langsdorffii. Specifically we evaluated the effect of aril removal by different dispersal agents (birds and ants) and fire on germination. The seeds were submitted to the following treatments: Control (seeds placed to germinate with aril intact); Acid (simulation of passage through the digestive tract of a bird); Aril removal (simulation of aril removed by ants); Fire (seeds exposed to fire). Germination percentage and time varied among treatments (X²=89. 735, P<0.001; X²=16.225, P<0.001, respectively). None of the control seeds (intact aril) germinated. Treatments that simulated dispersal (Acid, Aril removal) did not differ in germination percentage, with about 50% of the seeds germinating, however, the acid treatment accelerated seed germination. Fire also had a positive effect on seed germination with about 80% of the seeds germinating. Our results demonstrate the importance of dispersal agents to the population dynamics of C. langsdorffii. Furthermore, the capacity of seeds of C. langsdorffii to tolerate high temperatures is an important attribute for the occurrence of this species in the Cerrado.

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“…Wutke et al (1995) observaram que, em sementes de mucuna-preta (Mucuna aterrima), a impermeabilidade do tegumento foi superada com o uso do calor seco (55ºC), sendo mais efetivo os períodos de exposição entre 16 e 24 horas. As temperaturas de 60ºC e 70ºC, aplicadas durante 15 horas, foram mais eficientes na superação da dormência de sementes de Stylosanthes macrocephala e S. capitata, respectivamente (Alencar et al, 2009). Por outro lado, nem sempre o tratamento pré-germinativo com calor oferece resultados favoráveis quanto à superação da dormência em sementes de leguminosas.…”

Section: Superação Da Dormência Em Sementes De Visgueiro-do-igapó (Paunclassified

Superação da dormência em sementes de visgueiro-do-igapó (Parkia discolor)

Pereira¹,

Ferreira²

2010

Acta Amaz.

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RESUMOO presente trabalho teve como objetivo avaliar os efeitos da aplicação de tratamentos pré-germinativos de escarificação mecânica, bem como pré-tratamentos com calor, sobre a germinação de sementes de visgueiro-do-igapó (Parkia discolor Spruce ex Benth.). No primeiro experimento, sob delineamento inteiramente ao acaso, com quatro repetições, foram avaliados os pré-tratamentos: testemunha (sem pré-tratamento); desponte no lado distal; desponte no lado proximal; desponte nos lados distal e proximal; lixamento no lado distal; lixamento no lado proximal; lixamento nos lados distal e proximal; perfuração do tegumento com ferro-de-solda; e perfuração com pirógrafo. No segundo experimento, foi adotado o delineamento inteiramente casualizado, em esquema fatorial 2 (calor: seco e úmido) x 4 (temperatura: 40 o C, 50 o C, 60 o C e 70 o C) x 5 (período de condicionamento: 6, 16, 24, 30 e 48 horas), com três repetições. O desponte ou lixamento das sementes na porção proximal e porções proximal e distal possibilitaram uma embebição mais rápida (143-163%, aos três dias e meio) e, conseqüentemente, melhores resultados de germinação (98-100%, aos quatro dias), do índice de velocidade de germinação (1,351-1,460) e do tempo médio de germinação (3 dias). Os pré-tratamentos com calor (úmido e seco), sob diferentes temperaturas, e por vários períodos de condicionamento não superaram a dormência de sementes de P. discolor. PALAVRAS-CHAVE:Impermeabilidade do tegumento, tratamento pré-germinativo, germinação. Overcoming seed dormancy in visgueiro-of-the-igapó (Parkia discolor) ABSTRACTThis study aimed to evaluate the effects of pregerminative mechanical scarification treatments, as well as heat pre-treatments on the germination of visgueiro-of-the-igapó (Parkia discolor Spruce ex Benth.) seeds. The first experiment, with a completely randomized design and four repetitions, evaluated these pre-treatments: control (without pre-treatment); clipping at the distal portion; clipping at the proximal portion (hilum); clipping at the proximal and distal portions; scraping at the distal portion; scraping at the proximal portion; scraping at the proximal and distal portions; perforation of the husk with a soldering-iron; and perforation by pyrography. In the second experiment, with a completely randomized design and factorial 2 (heat: dry and wet) x 4 (temperature: 40 o C, 50 o C, 60 o C and 70 o C) x 5 (period of conditioning: 6, 16, 24, 30 and 48 hours), with three repetitions. The clipping or scraping of the seeds in the proximal portion and proximal and distal portions allowed faster imbibition of the seeds (143-163% in three days and half ), and consequently, better germination (98-100% in four days), germination speed rate (1,351-1,460) and average time of germination (3 days). The pre-treatment with heat (wet and dry), under different temperatures and different conditioning periods did not overcome the dormancy of P. discolor seeds.

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Tratamento térmico para superação da dormência em sementes de Stylosanthes SW. (fabaceae papilionoideae)

Cited by 13 publications

References 8 publications

Thermal scarification to overcome Piptadenia moniliformis seeds dormancy

Thermal scarification to overcome Piptadenia moniliformis seeds dormancy

Key factors affecting seed germination of Copaifera langsdorffii, a Neotropical tree

Superação da dormência em sementes de visgueiro-do-igapó (Parkia discolor)

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