Efeito de diferentes substratos e condições ambientais na germinação de sementes de Euterpe edulis Mart. e Geonoma schottiana Mart

Aguiar, Francismar Francisco Alves

doi:10.1590/s0102-33061990000300001

Cited by 6 publications

(5 citation statements)

References 2 publications

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“…It should be stressed that jussara palm is a native non-domesticated species and therefore possess a larger genetic variability than usually found in horticultural plants. The lowest germination level (53%) observed in this experiment, carried out under variable climatic conditions, was similar to and higher than what was reported by Aguiar (1990), respectively in a seed germinator, with 12-hour photoperiod and 25ºC, and in greenhouse (10% germination).…”

Section: Resultssupporting

confidence: 82%

Jussara palm seed germination under different shade levels

et al. 2008

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Jussara palm (Euterpe edulis) is a native plant of the Atlantic rainy forest, with large economic interest. The species is shade-tolerant and currently it is restricted to certain areas of difficult access. The most effective way to reintroduce it into the environment or increase the population density for conservation and commercial exploitation is promoting seed propagation. Considering that the jussara palm is an ombrophylous species, this experiment aimed to simulate forest conditions, with different shade levels, to analyze its influence on seed germination. After processing the seeds (depulping), 500 seeds were sown in containers (20 x 30 x 8 cm) filled with forest ground and grown in five shade levels (0, 20, 40,60, and 80%, simulated using black shadenet). The experimental design was blocks at random, with four 25-seed replications. We evaluated the percentage of seed germination and the Emergence Speed Index (ESI). Seed germination started 103 days after sowing. Although the percentage of germinated seeds in the different treatments varied between 53 (0% shade) and 72% (60% shade), there was no significant shade influence over percentage of seed germination and ESI.

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Section: Resultssupporting

confidence: 82%

Jussara palm seed germination under different shade levels

et al. 2008

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“…Light and water are important environmental factors for seed germination, and species have distinct requirements in this regard (Baskin & Baskin ). G. schottiana seeds showed high germination rates (72%) at Ψ = 0 MPa under light conditions, similar to the results reported by Aguiar (). However, a high proportion of the seeds covered by a thick litter layer or buried in forest soil may also germinate given the only slight relative decrease in seed germination (7%) of this palm under dark conditions; in addition, our light requirement index findings indicate that G. schottiana seeds are non‐photoblastic.…”

Section: Discussionsupporting

confidence: 90%

“…In the Ψ = −0.8 MPa treatment, the experiment was terminated after 300 days only in the Petri dishes showing nil seed germination. This time period was selected because seed germination in G. schottiana starts after a period of 206 days at Ψ = 0 MPa under light (Aguiar 1990). Once the experiment finished, ungerminated seeds that were subjected to water deficits (Ψ = −0.4 and −0.8 MPa) and flooding were transferred to deionized water at Ψ = 0 MPa under light conditions to test the proportion of seeds that maintained germinability.…”

Section: Seed Germination Under Different Light Conditions and Water ...mentioning

confidence: 99%

Ample germination ability under wide‐ranging environmental conditions in a common understory tropical palm

Braz

Ferreira

Portela

et al. 2015

Plant Species Biology

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Although palms play an important ecological role in tropical forests, characteristics related to their germinative niche remain largely unknown. We evaluated the seed germination characteristics of Geonoma schottiana, an abundant palm in the understory of different ecosystems of the Atlantic Rain Forest biome and the gallery forests of the Cerrado biome. We conducted experiments under light and dark conditions at Ψ = 0 MPa, and under two low-water-potential conditions and a flooded condition. Seed germination was highest at Ψ = 0 MPa under light (72%) and dark (67%) conditions. We observed moderate (51%) and low (18%) seed germination at Ψ = −0.4 and −0.8 MPa. About 20% of ungerminated seeds subjected to low water potentials for 300 days remained viable. No seeds germinated under flooded conditions; however, 23% of them maintained germinability. A delay in seed germination time was observed at low water potentials and an increase in synchrony occurred at Ψ = −0.8 MPa. G. schottiana seeds did not require specific light conditions to germinate, and the species possesses germinative characteristics to cope with deficit and excess of water. Probably, this wide germination niche allows for its seeds to germinate over a wide range of habitats in different types of ecosystems.

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“…Em relação à umidade, os substratos terra vegetal e vermiculita têm alta capacidade de retenção de água e isso pode explicar a germinação das sementes da espécie exótica (leucena) no grupo controle devido a sua baixa exigência fisiológica para superar a dormência. Entretanto, a terra vegetal, ao reter umidade, fica também mais suscetível à proliferação de microorganismos e agentes patogênicos, que podem atacar o embrião e degradar as substâncias de reservas da semente, impedindo sua germinação (Aguiar, 1990). A vermiculita é um mineral capaz de armazenar água e nutrientes do solo.…”

Section: Fonte: Autores a Partir Dos Dados Analisados (2020)unclassified

Avaliação do potencial de germinação de sementes de duas espécies, exótica e nativa, de Fabaceae como estratégia de colonização em ambiente degradado

Dantas

Rodrigues

Alves

et al. 2021

RSD

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O potencial de germinação de sementes de duas espécies de Fabaceae foi avaliado como estratégia de colonização de ambiente degradado. Sementes das espécies exótica Leucaena leucocephala (leucena) e nativa Enterolobium contortisiliquum (tamboril) foram tratadas por escarificação física (cocção a 100ºC, 10 min) e química (H2SO4 conc., 15 min), cultivadas em terra vegetal e vermiculita. Para ambas as espécies vegetais, a alta temperatura inviabilizou as sementes, mas a escarificação por ácido foi eficiente. Apesar de baixo, o potencial de germinação da espécie nativa, 30% e 40%, foi o dobro da espécie exótica, 15% e 20%, respectivamente em terra vegetal e vermiculita. O resultado do grupo controle mostrou que o tipo de substrato não influenciou o processo de germinação e apenas as sementes da espécie exótica germinaram nos dois substratos. Espécies exóticas são invasoras agressivas pela baixa exigência para germinação e consequente eficiência de colonização em áreas degradadas. Em condições naturais, a superação da dormência e a germinação de sementes podem ocorrer após tratamento ácido no estômago dos dispersores, como aves e mamíferos terrestres, e o contato com a umidade do solo. O potencial de germinação da espécie nativa E. contortisiliquum, superior ao da exótica L. leucocephala, configura uma vantagem estratégica da espécie nativa (pioneira longeva/secundária inicial) de floresta semidecídua e confirma seu papel ecológico para recuperação de áreas degradadas do domínio Mata Atlântica no estado da Bahia (Brasil).

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Efeito de diferentes substratos e condições ambientais na germinação de sementes de Euterpe edulis Mart. e Geonoma schottiana Mart

Cited by 6 publications

References 2 publications

Jussara palm seed germination under different shade levels

Jussara palm seed germination under different shade levels

Ample germination ability under wide‐ranging environmental conditions in a common understory tropical palm

Avaliação do potencial de germinação de sementes de duas espécies, exótica e nativa, de Fabaceae como estratégia de colonização em ambiente degradado

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