Efeito da temperatura e tratamentos pré-germinativos na germinação e vigor de plântulas de Jatropha curcas L.

Mota, Leandro Henrique de Sousa; Heinz, Rafael; Garbiate, Marcos Vinicios; Scalon, Silvana de Paula Quintão; Cremon, Thais; Neto, Antonio Luiz Viegas

doi:10.5007/2175-7925.2012v25n3p29

Cited by 3 publications

(3 citation statements)

References 12 publications

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“…The seeds obtained from experimental areas at UEG Ipameri Câmpus, Goiás, presented a relevant percentage of germination (77,0% of normal plants). Otherwise, (Pasquali et al 2012) evaluated the jatropha seeds germination under different temperatures and verified that the constant temperature of 25ºC reduced the germination of seeds, however Mota et al (2012) verified that jatropha seeds presented significant germination when submitted from 25 to 30ºC. Thus, the adoption of the alternating temperature of 20-30ºC, taking as reference the recommended for castor bean (Ricinus communis L.) (Brasil, 2009), contributed to the high percentage of normal seedlings.…”

Section: Resultsmentioning

confidence: 99%

Incidence of Cladosporium cladosporioides on Jatropha seeds and its effect on germination

et al. 2020

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The objective of this study was to estimate the incidence and perform morphological characterization of Cladosporium sp. found on the seeds and analyze their interference in the germination of Jatropha curcas. Therefore, jatropha seeds were sown in acrylic box gerbox type and incubated at 25°C for 14 days after sowing (DAS) to evaluate the fungus incidence. For the confection of semi-permanent slide mountings, fungus structures were removed with platinum handle and the measurement performed under a microscope. Another experiment was conducted in paper roll to evaluate germination 7 DAS. The occurring fungus specie was identified as Cladosporium cladosporioides, which incidence was 98.0%. In the test using paper roll, there was a percentage of normal seedlings of 77.0%, abnormal seedlings of 15.0% and dead seeds of 8.00%. The germination rate is not affected by the high incidence of the fungus in the seeds.

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Section: Resultsmentioning

confidence: 99%

Incidence of Cladosporium cladosporioides on Jatropha seeds and its effect on germination

et al. 2020

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“…It tends to influence water absorption speed and determining biochemical reactions on the germination (Carvalho & Nakagawa, 2012). Studies demonstrated the influence of different temperatures on germination potential and seedling vigor in J. curcas (Martins et al, 2008;Vanzolini et al, 2010;Mota et al, 2012;Pascuali et al, 2012).…”

Section: Introductionmentioning

confidence: 99%

Leaf morpho-anatomy of Jatropha curcas in vitro: Response to light conditions and temperature

et al. 2017

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Jatropha curcas L. plant is adapted to diverse climatic conditions with high requirement of heat stroke and drought resistant, having a special position among the attractive crops to biofuel program. This species has been studied from the perspectives of plant breeding, biotechnology and development of production systems. However, there are few reports of research regarding its anatomical characteristics. Thus, the objective of this study was to evaluate the effects of different conditions of light and temperature on the germination in vitro of J. curcas embryo and describe the leaf structure of seedlings through anatomical and micromorphological parameters. Embryos were excised and cultured in test tubes containing 15 ml of MS medium and grown in different temperature (25 °C and 30 °C) and light conditions (white, red, far red, and absence of light). The cultures were kept in BOD germinators chambers, with a 16 h photoperiod. Phytotechnical, anatomical and micromorphological (via electron scanning microscopy) characteristics were measured. The species J. curcas has a higher germination speed index when grown at 30 ºC. There is an increased of number of normal seedlings in white light and this point characterizes the species as neutral photoblastic. J. curcas presents uniseriate epidermis, palisade unistratified parenchyma, and spongy parenchyma composed of irregular cells. It is an amphistomatic species, with more stomata on the abaxial surface.

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“…A temperatura assume papel primordial no decorrer da germinação, controlando a intensidade e velocidade (SANTOS NETO et al, 2008;KUMAR et al, 2011;ORZARI et al, 2013), regulando as taxas de embebição, liberação de eletrólitos (MURPHY;NOLAND, 1982;KADER;JUTZI, 2002) e mobilização de reservas (ATAÍDE et al, 2013), afetando o crescimento e vigor das plântulas (MOTA et al, 2012;ALVES et al, 2013;PACHECO JUNIOR et al, 2013) e regulando a transcrição de genes associados à germinação (CHENG et al, 2010;CHIU et al, 2012).…”

Section: Introductionunclassified

ALTERAÇÕES FISIOLÓGICAS E BIOMÉTRICAS EM SEMENTES DEMelanoxylon brauna Schott DURANTE A GERMINAÇÃO EM DIFERENTES TEMPERATURAS1

2016

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RESUMO -Objetivou-se neste trabalho estudar as alterações biométricas e a germinação das sementes de Melanoxylon brauna em diferentes temperaturas. As sementes foram colocadas para germinar nas temperaturas constantes de 10, 25, 30 e 40 °C. Sementes da espécie também foram expostas às temperaturas de 10 e 40 ºC, por períodos de 24, 48, 72 e 96 h, e transferidas para a temperatura de 25 ºC. Foram analisados a porcentagem de germinação, o índice de velocidade de germinação (IVG) e o tempo médio de germinação. Durante a germinação nas temperaturas constantes, avaliaram-se as alterações biométricas do comprimento e a massa de matéria fresca dos eixos embrionários. Nas temperaturas de 25 e 30 ºC, foram verificados 93 e 98% de germinação, respectivamente. Em 10 e 40 ºC, a germinação foi de 5%. O IVG foi significativamente maior a 30 ºC. A embebição das sementes a 10 e 40 ºC, com posterior retorno a 25 ºC, resultou em acréscimos na germinação, em comparação com as temperaturas constantes. O comprimento e a massa de matéria fresca dos eixos embrionários aumentaram contínua e progressivamente durante a embebição.Palavras-chave: Germinação; Braúna; Sementes florestais. PHYSIOLOGICAL AND BIOMETRIC CHANGES IN Melanoxylon brauna Schott SEEDS DURING GERMINATION AT DIFFERENT TEMPERATURESABSTRACT -The aim of this work was to study the biometric changes and seed germination of Melanoxylon brauna at different temperatures. The seeds were germinated at constant temperatures of 10, 25, 30 and 40 °C. Seeds of the species were also exposed to temperatures of 10 and 40 °C for periods of 24, 48, 72 and 96 hours and transferred to 25 °C. The germination percentage, germination speed index (GSI) and mean germination time were analyzed. During germination at constant temperatures, the biometric changes of length and fresh weight of embryonic axes were evaluated. At temperatures of 25 and 30 °C, 93 and 98% germination were recorded, respectively. On 10 and 40 °C germination was 5%. The GSI was significantly higher at 30 °C. The soaking of seeds at 10 and 40 °C with subsequent return to 25 °C resulted in increases in germination, compared to constant temperatures. The length and fresh weight of embryonic axes increased continuously and progressively during soaking.

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Efeito da temperatura e tratamentos pré-germinativos na germinação e vigor de plântulas de Jatropha curcas L.

Cited by 3 publications

References 12 publications

Incidence of Cladosporium cladosporioides on Jatropha seeds and its effect on germination

Incidence of Cladosporium cladosporioides on Jatropha seeds and its effect on germination

Leaf morpho-anatomy of Jatropha curcas in vitro: Response to light conditions and temperature

ALTERAÇÕES FISIOLÓGICAS E BIOMÉTRICAS EM SEMENTES DEMelanoxylon brauna Schott DURANTE A GERMINAÇÃO EM DIFERENTES TEMPERATURAS1

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