Efeito da temperatura e a participação do fitocromo no controle da germinação de sementes de embaúba

Godoi, Simone; Takaki, Massanori

doi:10.1590/s0101-31222005000200013

Cited by 24 publications

(8 citation statements)

References 11 publications

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“…Figure 2 shows that a lower germination rate was obtained at 20 o C for all lots, a result which confirms the worse performance of the seeds at this temperature. According to Godoi and Takaki (2005), temperature affects water absorption rate, and according to Höes et al (2004) and Bewley et al (2013), it also affects the biochemical reactions that regulate the metabolism of the germination process. Therefore, it affects both the rate and uniformity of germination and total germination.…”

Section: Resultsmentioning

confidence: 99%

Standard germination test in physic nut (Jatropha curcas L.) seeds

et al. 2014

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-Defining adequate methods to assess seed germination is important to control the quality of commercial lots, especially for species that are not yet included in the Rules for Seed Testing. This study aimed to establish an adequate procedure for germination test in physic nut seeds (J. curcas L.). Three seed lots, in eight replications of 25 seeds each, were sown on paper towel rolls moistened with a water volume equivalent to 2.7 the weight of the dry paper and in sterilized sand moistened up to 60% of its water-holding capacity. The seeds of each treatment were maintained on germination chambers at temperatures of 20, 25, 30 and 20-30 o C. Daily counts were made to define the ideal date to perform the first and the last count test. Criteria for classifying seedlings as normal and abnormal were also established. The experiment was conducted in a completely randomized design in a split plot arrangement, and the means were compared by Tukey's test (P<0.05). For maximum germination potential of physic nut seeds, the germination test should be conducted at 25 o C and 30 o C, using sand or paper towel as a substrate, with the counts at 7 and 12 days after sowing.Index terms: viability, methodology, seeds, physic nut.Teste de germinação em sementes de pinhão manso (Jatropha curcas L.) RESUMO -Estabelecer procedimento adequado para a condução do teste de germinação com espécies que ainda não constam nas Regras para Análise de Sementes é de grande importância para viabilizar a certificação e comercialização de lotes. Objetivou-se estabelecer metodologia para a condução do teste de germinação em sementes de pinhão manso (J. curcas L.). Sementes de três lotes, em oito repetições de 25, foram semeadas nos seguintes substratos: rolo de papel toalha umedecido com volume de água equivalente a 2,7 vezes o peso do papel seco, confeccionando-se rolos; areia esterilizada e umedecida até 60% da sua capacidade de retenção (entre areia). As sementes foram mantidas em germinadores nas temperaturas de 20, 25, 30 °C e 20-30 ºC, realizando-se contagens diárias para definir a data ideal para as avaliações do teste. Foram estabelecidos também critérios para a classificação das plântulas como normais e anormais. O experimento foi conduzido em DIC, em esquema de parcela subdividida. As médias dos tratamentos foram comparadas pelo teste de Tukey (P<0,05). Para a obtenção do potencial máximo de germinação das sementes de pinhão manso, o teste de germinação deve ser conduzido nas temperaturas de 25 o C ou 30 o C, utilizando-se semeadura entre areia ou em rolo de papel, com contagens aos 7 e 12 dias após a semeadura.Termos para indexação: viabilidade, metodologia, sementes, pinhão manso.

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Section: Resultsmentioning

confidence: 99%

Standard germination test in physic nut (Jatropha curcas L.) seeds

et al. 2014

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“…The same pattern has been observed in Torresia acreana and Cecropia glaziovii seeds. This phenomenon occurs because water absorption and biochemical reactions occur more quickly at higher temperatures [42,43].…”

Section: Discussionmentioning

confidence: 99%

Germination of Seeds of Melanoxylon brauna Schott. under Heat Stress: Production of Reactive Oxygen Species and Antioxidant Activity

Santos

Borges

Ataíde

et al. 2017

Forests

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Abstract:In this article, the authors aimed to analyze the physiological and biochemical alterations in Melanoxylon brauna seeds subjected to heat stress. For this, seed germination, electric conductivity (EC), the production of reactive oxygen species (ROS), and the activity of antioxidant enzymes were assessed. Seeds were incubated at constant temperatures of 25, 35, and 45 • C. Independent samples were first incubated at 35 and 45 • C and then transferred to 25 • C after the intervals of 24, 48, 72, and 96 h. To evaluate EC, seeds were soaked for 0, 24, 48, and 72 h, at 25, 35, and 45 • C and then transferred to Erlenmeyer flasks containing 75 mL of deionized water at 25 • C, for 24 h. ROS production and enzyme activity were assessed every 24 h in seeds soaked at the aforementioned temperatures. Germination did not occur at 45 • C. Seeds soaked at 35 • C for 72 h and then transferred to 25 • C showed higher percentages of germination and a higher germination speed. Seed soaking at 45 • C increased peroxide production, which compromised the antioxidant enzyme system due to a reduction in the activity of enzymes APX, POX, and CAT, thus ultimately also compromising the cell membrane system.

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“…and Cecropia glaziovii Snethl., which germinate at 25 and 30 °C (ARAÚJO NETO et al, 2002;GODÓI;TAKAKI, 2005).…”

Section: Methodsmentioning

confidence: 99%

TEMPERATURE AND SUBSTRATE INFLUENCES ON SEED GERMINATION AND SEEDLING FORMATION IN Callisthene fasciculata Mart. (VOCHYSIACEAE) IN THE LABORATORY1

Oliveira

Souza

et al. 2015

Rev. Árvore

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-Callisthene fasciculata Mart. is a tree belonging to the Vochysiaceae family. Its wood is moderately heavy and resistant and used to make poles, beams, and other structures. The aim of this work was to evaluate seed germination and the initial growth of seedlings of C. fasciculata at different temperatures and in different substrates. Seeds were collected from fruits in the Pantanal de Miranda, Mato Grosso do Sul state, Brazil. In one experiment, the seeds were subjected to constant temperatures of 20, 25, 30 and 35 °C and to alternating temperatures of 20-30 and 25-35 °C (on paper substrate). In another experiment, the seeds were subjected to temperatures of 20 and 25 °C on three substrates (sand, vermiculite and between paper) in a germinator. The experiment had a randomized design, with four replicates of 25 seeds per treatment. The F-values obtained for germination indicated no significant effect of substrate or temperature on the final germination percentage. The analyses revealed no effect of a treatment interaction (temperature x substrate) on either germination or average germination time; however, a treatment interaction effect was observed on the germination speed index. The treatment combinations yielding the best performance were between paper substrate at 20 °C and sand substrate at 25 °C. There was a significant effect of the interaction between temperature and substrate on seedling growth, with increased root growth observed in the between paper substrate at 25 °C and increased aerial component growth in both sand at 20 °C and vermiculite at 25 °C. The between paper treatment at 25 °C yielded the greatest final seedling size. Between paper is the most recommended substrate for the production of seedlings due to its ease of handling and lower probability of contamination.

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Efeito da temperatura e a participação do fitocromo no controle da germinação de sementes de embaúba

Cited by 24 publications

References 11 publications

Standard germination test in physic nut (Jatropha curcas L.) seeds

Standard germination test in physic nut (Jatropha curcas L.) seeds

Germination of Seeds of Melanoxylon brauna Schott. under Heat Stress: Production of Reactive Oxygen Species and Antioxidant Activity

TEMPERATURE AND SUBSTRATE INFLUENCES ON SEED GERMINATION AND SEEDLING FORMATION IN Callisthene fasciculata Mart. (VOCHYSIACEAE) IN THE LABORATORY1

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