Germinação de sementes de castanheira-do-pará armazenadas em areia úmida

Silva, Antonio Nobre da; Coelho, Maria de Fátima Barbosa; Guimarães, Sebastião Carneiro; Albuquerque, Maria Cristina de Figueiredo e

doi:10.1590/s0100-204x2009001100009

Cited by 11 publications

(9 citation statements)

References 13 publications

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“…As a consequence, it is demanded more time for germination, since a radicle needs to be developed. B. excelsa usually has a germination process that lasts up to five months after sowing, reaching a germination percentage higher than 70% (Müller, 1982;Silva et al, 2009). In this study, like in Frazão et al (1984), after 180 days there were still viable seeds left in the seedbed.…”

Section: Seedling Emergence and Initial Growthmentioning

confidence: 45%

Seedling production of Bertholletia excelsa in response to seed origin and position inside fruit

Dionísio

Auca

Schwartz

et al. 2019

Agraria

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Bertholletia excelsa, known as Brazil nut, is an economically valuable tree species from the Amazon. Seeds of B. excelsa figure as one of the most important non-timber forest products in Bolivia, Brazil, and Peru. These seeds, however, have physiological dormancy, which makes the germination slow, irregular, and often in low percentages. Such biological feature represents a bottleneck to the production of high quality seedlings. In an experiment performed in Puerto Maldonado, Peru, ten fruits were collected per individual in 15 trees of B. excelsa in each of the two areas: an experimental planting and a native forest. Several variables regarding fruit biometry, germination, initial growth, and seedlings quality indexes were measured in order to compare B. excelsa seedlings produced by seeds from two areas and also regarding the lower and upper seed position inside the fruit. Both fruit length and diameter presented low variation and most of the fruits had flat shape. Seeds were more abundant in the lower position (mean = 12.9 ± 2.2) than in the upper position (mean = 6.5 ± 2.1) inside the fruit. Considering the total number of seeds per fruit, the means were 19.4 ± 3.2 and 17.5 ± 3.7 for planted and native forest, respectively. Complete germination did not differ between areas (F 1, 56 = 1.945, p = 0.169). Seedlings produced with seeds from planted and from the lower position inside the fruit presented higher quality indexes.

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Section: Seedling Emergence and Initial Growthmentioning

confidence: 45%

Seedling production of Bertholletia excelsa in response to seed origin and position inside fruit

Dionísio

Auca

Schwartz

et al. 2019

Agraria

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“…For the seeds of Bertholletia excelsa Bonpl. the application of GA 3 may have a negative effect on germination (Silva et al 2009). …”

Section: Resultsmentioning

confidence: 99%

Physiological, morphological and biochemical characteristics of the sexual propagation of Piper aduncum (Piperaceae)

Dousseau¹,

Alvarenga²,

Alves³

et al. 2011

Rev. bras. Bot.

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-(Physiological, morphological and biochemical characteristics of the sexual propagation of Piper aduncum (Piperaceae)). In this work we attempted to characterize the diaspores and the germination process of Piper aduncum L., as well as to verify the influence of the interaction between presence and absence of light (photoperiod of 12 hours and dark) and temperature (25 °C, 30 °C and 20-30 °C) and also of gibberellin (0, 50, 100, 200 and 400 mg L -1 ) on the root protrusion and normal seedlings formation. The diaspores are very small with a thousand seed weight of 0.3645 g, 13% moisture and protein reserve. Diaspores are strict positively photoblastic in the tested temperature range and the optimum temperature for root protrusion was 30 °C, while for normal seedlings was 25 °C. The previous permanence in the dark led to an increase in the speed of root protrusion and percentage and speed of seedling formation. The application of gibberellic acid negatively interfered with the protrusion and growth of the radicle while favoring the elongation of hypocotyls.Key words -germination, gibberellin, light, post-germination, temperature RESUMO -(Características fisiológicas, morfológicas e bioquímicas da propagação sexual de Piper aduncum (Piperaceae)). Buscou-se neste trabalho efetuar a caracterização dos diásporos maduros e do processo germinativo de Piper aduncum L., bem como verificar a influência da interação entre presença e ausência de luz (fotoperíodo de 12 horas e escuro) e temperaturas (25 °C, 30 °C e 20-30 °C) e do ácido giberélico (0, 50, 100, 200 e 400 mg L -1 ) sobre a germinabilidade e o vigor, considerando a protrusão radicular e as plântulas normais. Os diásporos são diminutos com peso de 0,3645 g para mil sementes, 13% de umidade e reserva protéica. São fotoblásticos positivos estritos, na faixa de temperatura testada e a temperatura ótima para a protrusão radicular foi 30 °C, enquanto que para a formação de plântulas normais foi 25 °C. A prévia permanência no escuro levou a um aumento na velocidade de protrusão radicular, e, principalmente, a porcentagem e velocidade de formação de plântulas foram favorecidas. A aplicação de ácido giberélico influenciou negativamente na protrusão e no crescimento da radícula e favoreceu o alongamento do hipocótilo.

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“…Sand has been reported as an excellent substrate to maintain viability of stored seeds of B. excelsa (Silva et al, 2009) and germination of many tree species (Dionisio et al, 2017;Marques et al, 2018a).…”

Section: /6mentioning

confidence: 99%

Production of Bertholletia excelsa Humb. & Bonpl., (Lecythidaceae) seedlings in microenvironments under different substrates

Dionísio

Auca

Lozano³

et al. 2019

Agraria

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The lack of technological options for forest concessionaires to produce seedlings of native tree species in the Peruvian Amazon is a bottleneck for reforestation in the region. In this study, a new technology for seedlings production of low cost and accessible to producers was developed. Thus, the objective of this study was to evaluate the efficiency of using buckets as microenvironments under different substrates for the initial growth of Bertholletia excelsa seedlings. Forty days after germinating, the seedlings were transplanted to 115 cm³ tubes containing a standard substrate composed by sand + sawdust + charred sawdust in the proportion of 1:1:1 v/v. Afterwards, the tubes were settled in buckets (microenvironments) under a 100% shade net. The experimental design used in this study was fully randomized and the treatments were T1 = sand, T2 = sand + sawdust, T3 = decomposed Brazil nut shell and T4 = forest soil. The substrate T2 promoted the shoot length, root length, leaves number, shoot dry mass, root dry mass, total dry mass, and slenderness index in B. excelsa seedlings. Quality of B. excelsa seedlings produced in microenvironments was similar among treatments, regardless of the used substrate.Produção de mudas de Bertholletia excelsa Humb. & Bonpl., (Lecythidaceae) em microambientes e diferentes substratos RESUMO: A falta de opções tecnológicas de concessionários de florestas para a produção de mudas de espécies nativas na Amazônia peruana é um gargalo para o reflorestamento na região. Neste estudo, uma nova tecnologia de produção de mudas de baixo custo e acessível a produtores foi desenvolvida. Assim, o objetivo neste trabalho foi avaliar a eficiência do uso de baldes como microambientes e substratos para o crescimento inicial de plântulas de Bertholletia excelsa. Aos 40 dias após a emergência, as plântulas foram repicadas para tubetes com capacidade de 115 cm³, contento um substrato padrão composto por areia + serragem + serragem carbonizada na proporção (1:1:1 v/v). Posteriormente, os tubetes foram acondicionadas em baldes (microambientes) com telado a 100% de sombra. O delineamento experimental foi inteiramente ao acaso e os tratamentos foram: T1 = areia, T2 = areia + serragem, T3 = casca de castanha decomposta e T4 = solo de floresta. O substrato T2 favoreceu o comprimento de parte aérea, raiz, número de folhas, massa seca da parte aérea, raízes e total, além do índice de esbeltez de mudas de B. excelsa. A qualidade das mudas de B. excelsa produzidas em microambientes foi semelhante entre os tratamentos, independente do substrato utilizado.Palavras-chave: castanheira-do-brasil; concessionários florestais; Amazônia peruana; reflorestamento; qualidade de mudas Production of Bertholletia excelsa Humb. & Bonpl., (Lecythidaceae) seedlings in microenvironments under different substrates Rev. Bras.

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Germinação de sementes de castanheira-do-pará armazenadas em areia úmida

Cited by 11 publications

References 13 publications

Seedling production of Bertholletia excelsa in response to seed origin and position inside fruit

Seedling production of Bertholletia excelsa in response to seed origin and position inside fruit

Physiological, morphological and biochemical characteristics of the sexual propagation of Piper aduncum (Piperaceae)

Production of Bertholletia excelsa Humb. & Bonpl., (Lecythidaceae) seedlings in microenvironments under different substrates

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