Germinação de sementes em desenvolvimento de Bixa orellana

Amaral, Luís; Pereira, Maria de Fátima Domingos Aleixo; Cortelazzo, Ângelo Luiz

doi:10.1590/s0103-31312000000300010

Cited by 10 publications

(17 citation statements)

References 15 publications

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“…According to Amaral et al (2000), in the last maturation stage of B. orellana seeds, there is an increase in impermeability of the integument to water, which culminates in a dormancy imposed by the tegument. This dormancy is responsible for the low germination of the species, since the germinative process is not initiated in the absence of water.…”

Section: Discussionmentioning

confidence: 99%

GERMINATION AND VIGOR OF Bixa orellana L. SEEDS PRE-SOAKED IN A PLANT BIOSTIMULANT

Neto

Santos

Ferreira

et al. 2018

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The aim of this study was to assess the germination and vigor of Bixa orellana seeds that were pre-soaked in different concentrations of Stimulate ® plant biostimulant. For the standard germination test, Bixa orellana seeds from the Embrapa 37 Cultivar were pre-soaked (for periods of four and eight hours) in the following concentrations of Stimulate ® aqueous solution: 3.0; 6.0; 9.0; and 12.0 mL L -1 . Seeds that were pre-soaked in distilled water were used as control. The following parameters were tested: germination; first germination count; abnormal seedlings; length; and seedling dry mass. The experimental design was completely randomized and a 2 x 5 + 1 factorial design was used (with two pre-soaking periods, five Stimulate ® concentrations, and one additional control without pre-soaking). Four replicates of 50 seeds were performed for each treatment. Water immersion treatments for four and eight hours were efficient for breaking dormancy in Bixa orellana seeds, since they promoted better germination in relation to the intact seeds that were not pre-soaked. The presoaking of Bixa orellana seeds for eight hours in a 12.0 mL L -1 Stimulate ® concentration presented the best results in terms of germinative performance and seedling growth, with greater accumulation of dry mass. Therefore, this practice is recommended for the production of seedlings of this species.

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Section: Discussionmentioning

confidence: 99%

GERMINATION AND VIGOR OF Bixa orellana L. SEEDS PRE-SOAKED IN A PLANT BIOSTIMULANT

Neto

Santos

Ferreira

et al. 2018

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“…Este padrão de dessecamento das sementes também foi observado em Cedrela fissilis (Corvello et al 1999), Bixa orellana (Amaral et al 1999), Sesamum indicum (Day 2000), Miconia cinnamomifolia (Pereira & Mantovani 2001) e Tibouchina granulosa (Lopes et al 2005), que nas fases iniciais de desenvolvimento, apresentavam frutos e sementes com alto conteúdo de água, em torno de 85%, que tenderam a diminuir nas fases finais do desenvolvimento.…”

Section: Discussionunclassified

“…Em Bixa orellana (Amaral et al 1999) foi observado que após o período em que as sementes atingiram o máximo de peso seco, e com a diminuição acentuada de umidade (10,4% na fase final) a germinação também diminuiu. A germinação foi baixa nas fases finais de maturação porque o tégmen da maioria das sementes já estava completamente impermeável, impedindo a entrada de água nas sementes, indicando a presença de dormência física das sementes.…”

Section: Discussionunclassified

“…As determinações mais utilizadas têm sido o teor de umidade e o peso da matéria seca, comprovados com sementes de Bixa orellana (Amaral et al 1999), Tibouchina granulosa (Lopes et al 2005), Mucuna aterrima (Nakagawa et al 2005) e Trigonella coerulea (Akhalkatsi & Lösch 2005). A coloração e o aspecto morfológico dos frutos são medidas práticas de avaliação (Amaral et al 1999), porém não tão precisas.…”

Section: Introductionunclassified

“…A coloração e o aspecto morfológico dos frutos são medidas práticas de avaliação (Amaral et al 1999), porém não tão precisas.…”

Section: Introductionunclassified

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Época de colheita e capacidade germinativa de sementes de Tibouchina mutabilis (Vell.) Cogn. (Melastomataceae)

2007

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Simão, E., Nakamura, A.T. & Takaki, M. Harvest period and germination capacity of Tibouchina mutabilis (Vell.) Cogn. (Melastomataceae) seeds. Biota Neotrop. Jan/Apr 2007 vol. 7, no. 1 http://www.biotaneotropica.org.br/v7n1/pt/abstract?article+bn01507012007 ISSN 1676-0603.An important step for understanding the dynamic of plant species in their environment is the study of their reproductive feature. Tibouchina mutabilis (Vell.) Cogn. (Melastomataceae) is a characteristic species of Serra do Mar, with potential for recovery of degraded areas and with landscaping purpose. The aim of this study was to investigate the acquisition of germination capacity of seeds and establishment of the best period for fruit harvest by weekly harvests, when morphological and germination capacity features were observed in four stages of development. The T. mutabilis seeds germinated only under white light. Besides the necessity of light for germination, seeds of T. mutabilis did not show another type of dormancy at the end of the ripening, with high germination percentage. The germination rate increases progressively in the function of lose of moisture in the subsequent stages of development, suggesting that the high moisture was the factor that restricted the germination. The best indicator of physiological maturation of seeds is the natural opening of the capsule. The advantage of this parameter is that it can be widely utilized and it is easy to recognize it. Due to the anemochoric dispersion of seeds, we propose that the harvest must be done, with good results, of fruit with 21 days after anthesis, and drying the fruit for capsule opening for seed extraction.Keywords: seed germination, seed maturation, morphology. ResumoSimão, E., Nakamura, A. O estudo dos aspectos reprodutivos é um importante passo para entendermos a dinâmica das espécies em seu ambiente natural. Tibouchina mutabilis (Vell.) Cogn. (Melastomataceae), espécie característica da Serra do Mar, apresenta potencial para recuperação de áreas degradadas e para fins paisagísticos. Objetivou-se investigar a aquisição da capacidade germinativa das sementes e o estabelecimento da melhor época para colheita de frutos da espécie por meio de coletas semanais, onde as características morfológicas e a capacidade germinativa foram observadas, em quatro estádios de desenvolvimento. A capacidade germinativa foi observada com 14 dias pós-antese e a máxima germinação foi observada aos 21 dias. As sementes T. mutabilis germinaram somente na luz. Além da necessidade da luz para a germinação, as mesmas não apresentaram nenhum tipo de dormência na fase final de maturação, apresentando alta porcentagem de germinação, A velocidade de germinação aumentou progressivamente em função do dessecamento das sementes nas subseqüentes fases avaliadas, sugerindo que a alta umidade foi o fator limitante para a germinação. O melhor indicador de maturação fisiológica e de fácil observação, para a espécie, é o início da abertura natural das cápsulas, entretanto, devido às sementes anemocóricas pequ...

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Anatomical and biochemical changes in the composition of developing seed coats of annatto (Bixa orellana L.)

Amaral

Cortelazzo

Buckeridge

et al. 2008

Trees

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Seeds of Bixa orellana (L.) have a sclerified palisade cell layer, which constitutes a natural barrier to water uptake. In fact, newly fully developed B. orellana seeds are highly impermeable to water and thereby dormant. The purpose of this work is to investigate, from a developmental point of view, the histochemical and physical changes in the cell walls of the seed coat that are associated with the water impermeability. Seed coat samples were analyzed by histochemical and polarization microscopy techniques, as well as by fractionation/HPAEC-PAD. For histochemical analysis the tissue samples were fixed, dehydrated, embedded in paraffin and the slides were dewaxed and tested with appropriate stains for different cell wall components. Throughout the development of B. orellana seeds, there was a gradual thickening of the seed coat at the palisade region. This thickening was due to the deposition of cellulose and hemicelluloses in the palisade layer cell walls, which resulted in a highly water impermeable seed coat. The carbohydrate composition of the cell walls changed dramatically at the late developmental stages due to the intense deposition of hemicelluloses. Hemicelluloses were mainly deposited in the outer region of the palisade layer cell walls and altered the birefringent pattern of the walls. Xylans were by far the most abundant hemicellulosic component of the cell walls. Deposition of cellulose and hemicelluloses, especially xylans, could be responsible for the impermeability to water observed in fully developed B. orellana seeds.

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Germinação de sementes em desenvolvimento de Bixa orellana

Cited by 10 publications

References 15 publications

GERMINATION AND VIGOR OF Bixa orellana L. SEEDS PRE-SOAKED IN A PLANT BIOSTIMULANT

GERMINATION AND VIGOR OF Bixa orellana L. SEEDS PRE-SOAKED IN A PLANT BIOSTIMULANT

Época de colheita e capacidade germinativa de sementes de Tibouchina mutabilis (Vell.) Cogn. (Melastomataceae)

Anatomical and biochemical changes in the composition of developing seed coats of annatto (Bixa orellana L.)

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