Effects of light and temperature on seed germination in Cecropia hololeuca Miq. (Cecropiaceae)

Godoi, Simone; Takaki, Massanori

doi:10.1590/s1516-89132004000200004

Cited by 38 publications

(19 citation statements)

References 13 publications

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“…This ensures greater efficiency in the establishment of seedlings because seeds are able to produce seedlings that will find the ideal conditions for development, as suggested by Godoi and Takaki (2004).…”

Section: Resultsmentioning

confidence: 99%

Overcoming dormancy and determining optimal temperature for slender serradella seed germination

et al. 2015

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-The objective of this study was to identify the most efficient method for overcoming coat-imposed dormancy and determine the optimal germination temperature for Ornithopus pinnatus seeds. Treatments to overcome dormancy were: intact seeds; immersion in hot water at 60 ºC, followed by soaking in the same water (unheated)/24 h; immersion in hot water at 90 ºC, followed by soaking in the same water (unheated)/24 h; mechanical scarification; chemical scarification, H 2 SO 4 /5 min; and chemical scarification, H 2 SO 4 /10 min. Percentages were calculated for germinated, abnormal, dormant, and dead seeds. Optimal germination temperatures were calculated using eight constant temperatures (0, 5, 10, 15, 20, 25, 30, and 35 °C), with 8 h of light and 16 h of darkness. Germination rate, frequency, and synchronization index of germination were used as parameters to establish optimum temperature for germination. A completely randomized experimental design was used, with twelve repetitions of 100 seeds per treatment. Data obtained were subjected to analysis of variance and Tukey's test at a 5% significance level. O. pinnatus seeds exhibit dormancy caused by the seed coat's impermeability to water. Mechanical scarification was efficient in promoting seed germination. The species is stenothermal, meaning it cannot tolerate significant temperature variations. The germination rate of seeds was linearly dependent on temperature. Synchronization of the germination process is greater in the optimum temperature range, established between 15 and 20 °C.

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Section: Resultsmentioning

confidence: 99%

Overcoming dormancy and determining optimal temperature for slender serradella seed germination

et al. 2015

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“…If this is true, this endogenous regulation of germination could be part of a plant strategy to assure the success of the reproductive cycle (Melo et al, 1998;Eira and Caldas, 2000). Some plant species use environmental cues, such as drought, rainfall, temperature, and fire to synchronize the germination of the majority of the seeds at a particular time, while other species have an asynchronous germination pattern over an extended time (Eira and Caldas, 2000;Godoi and Takaki, 2004;Hölzel and Otte, 2004). Therefore, the lack of the dormancy associated with the seed coat together with the asynchronism of A. edulis seed germination could indicate an endogenous control of germination as a surviving strategy, which is not unusual in Cerrado plant species (Melo et al, 1998).…”

Section: Discussionmentioning

confidence: 99%

Micropropagation of Alibertia edulis Rich

Silva

Pereira

Silveira

2008

Braz. arch. biol. technol.

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“…The light sensitivity by seeds is dependent on phytochrome action and this sensitivity changes with the temperature (Smith 1975). In some species, alternating temperatures can overcome light requirement for germination as reported by Godoi & Takaki (2004) in Cecropia hololeuca and Sugahara & Takaki (2004) in Psidium guajava.…”

Section: Introductionmentioning

confidence: 91%

Effect of light and temperature on seed germination in Tibouchina mutabilis (Vell.) Cogn. (Melastomataceae)

Simão

Takaki

2008

Biota Neotrop.

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TAKAKI, M. 2008. Effect of light and temperature on seed germination in Tibouchina mutabilis (Vell.) Cogn. (Melastomataceae). Biota Neotrop. 8(2): http://www.biotaneotropica.org.br/v8n2/en/ abstract?article+bn00908022008. Abstract:The effect of light and temperature on Tibouchina mutabilis seed germination was analyzed by isothermic incubations in the range of 10 to 40 °C, with 5 °C intervals under both continuous white light (32.85 molm -2 s -1 ) and darkness and alternating temperatures (15-20; 15-25; 15-30; 15-35; 20-25; 20-30; 20-35; 25-30; 25-35 and 30-35 °C) under both photoperiod of 12 hours and continuous darkness. The seeds of T. mutabilis need light to trigger the germination and no germination was observed in darkness. ), com intervalos de 5°C e temperaturas alternadas (15-20; 15-25; 15-30; 15-35; 20-25; 20-30; 20-35; 25-30; 25-35 e 30-35 °C) sob fotoperíodo de 12 horas de luz branca. As sementes de T. mutabilis requerem luz para germinar, sendo nula a germinação no escuro em todas as temperaturas testadas. A faixa ótima de temperatura para a germinação foi de 25 a 30 °C e a alternância de temperaturas de 20-25 °C. Estes resultados indicam que T. mutabilis apresenta comportamento de uma espécie pioneira e que as alternâncias diárias de temperatura não alteraram a sensibilidade da semente à luz. Palavras-chave: fitocromo, germinação de sementes, luz, Tibouchina.

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Effects of light and temperature on seed germination in Cecropia hololeuca Miq. (Cecropiaceae)

Cited by 38 publications

References 13 publications

Overcoming dormancy and determining optimal temperature for slender serradella seed germination

Overcoming dormancy and determining optimal temperature for slender serradella seed germination

Micropropagation of Alibertia edulis Rich

Effect of light and temperature on seed germination in Tibouchina mutabilis (Vell.) Cogn. (Melastomataceae)

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