Germinação de sementes de Matelea maritima (Jack.) Woods (Asclepiadaceae)

Cuzzuol, Geraldo Rogério Faustini; Lucas, Neide Maria

doi:10.1590/s0100-84041999000100001

Cited by 7 publications

(5 citation statements)

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“…A narrow temperature range and optimal mild temperature of 20°C have also been detected for the sympatric cacti Pilosocereus ulei and Cereus fernambucensis (L. S. T. Martins and A. C. S. de Andrade, unpubl. data, 2009) and for some perennial succulents in hot semideserts (Baskin & Baskin 2001), but this result is rather unusual for the origin and distribution of other restinga species (Cuzzuol & Lucas 1999;Pinheiro & Borghetti 2003). This contrast is reinforced by measurements of soil temperatures (0-5 cm) made by Sá (2002) on restinga vegetation of Jacarepia Ecological Reserve (15 km away from Arraial do Cabo).…”

Section: Discussionmentioning

confidence: 95%

Seed germination of Pilosocereus arrabidae (Cactaceae) from a semiarid region of south‐east Brazil

Martins

Pereira

Carvalho

et al. 2012

Plant Species Biology

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We evaluated the effect of temperature regimes (six constant and four alternating temperatures), light qualities (five red : far red ratios) and water potentials (YW; seven NaCl and polyethylene glycol 6000 [PEG] solutions) on the percentage and germination rate, as well as the post-seminal development morphology, that allow Pilosocereus arrabidae seeds to germinate in a hot semiarid climate on the south-eastern Brazilian coast. The results showed that seeds germinated similarly between constant and alternating temperatures, with an optimal germination at 25/20°C and 20°C. Pilosocereus arrabidae seeds were photoblastic positive and the final germination percentage was inhibited at low red : far red ratios. Maximum germination was obtained in distilled water (0 MPa) and decreases of YW in the solutions reduced the germination, which was lower in NaCl than in iso-osmotic PEG solutions. Germination inhibition appears to be osmotic because the recovery response was high when non-germinated seeds from both iso-osmotic solutions were transferred to water. Seeds of P. arrabidae are small and germination is phaneroepigeal. Despite the slow growth typically seen in seedlings and adults of Cactaceae, germination in this species depends on the ability of the seeds to appropriately sense and react to environmental cues that correlate with times and places under low-risk growth conditions.

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Section: Discussionmentioning

confidence: 95%

Seed germination of Pilosocereus arrabidae (Cactaceae) from a semiarid region of south‐east Brazil

Martins

Pereira

Carvalho

et al. 2012

Plant Species Biology

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“…Assim, as sementes de monjoleiro mantiveram a sensibilidade à luz, para a germinação, nas diferentes condições de acondicionamento e de armazenamento testadas. Esse comportamento difere do apresentado por sementes de algumas espécies, em que o requerimento de luz diminui com o tempo de armazenamento, como Urera caracasana (Orozco-Segovia et al, 1987), Matelea maritima (Cuzzuol & Lucas, 1999) e Guazuma ulmifolia (Araújo Neto et al, 2002b). O regime de temperatura também não alterou o comportamento germinativo das sementes de monjoleiro em função da luz, tal TABELA 1.…”

Section: Resultsunclassified

“…Assim, sementes de Matelea maritima acondicionadas em sacos de papel e armazenadas em ambiente normal de laboratório perderam o fotoblastismo positivo após três meses (Cuzzuol & Lucas, 1999). Sementes recém-colhidas de Guazuma ulmifolia tiveram a germinação promovida pelas luzes branca e vermelha e inibida na ausência de luz e sob luz vermelhaextrema, enquanto que as acondicionadas em sacos plásticos e armazenadas em câmara seca por um ano perderam a sensibilidade à luz, germinando da mesma forma quando submetidas às quatro qualidades de luz testadas (Araújo Neto et al, 2002b).…”

Section: Introductionunclassified

Armazenamento e requerimento fotoblástico de sementes de Acacia polyphylla DC

Neto

Aguiar

Ferreira

et al. 2005

Rev. bras. sementes

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Acacia polyphyla (Mimosaceae) é uma espécie arbórea nativa do Brasil, importante para a recuperação de áreas degradadas. Sementes dessa espécie foram armazenadas em condições naturais e artificiais, com os objetivos de avaliar a longevidade das sementes no solo, conservar a sua qualidade fisiológica pelo período correspondente a duas colheitas e verificar o requerimento fotoblástico das sementes armazenadas. Em condições naturais, as sementes foram enterradas em clareira, sob dossel ralo e sob dossel denso. As sementes deterioraram rapidamente, revelando-se incapazes de compor o banco de sementes do solo. Em condições artificiais, as sementes foram acondicionadas em diferentes embalagens e armazenadas por dois anos em ambiente não controlado e em câmara fria. Periodicamente, as sementes foram colocadas para germinar a 25ºC, na ausência de luz e sob fotoperíodo de oito horas sob luzes branca e de sombreamento. Durante todo o período de armazenamento, a germinação no escuro foi inferior à constatada sob luzes branca e de sombreamento. A qualidade fisiológica foi conservada por dois anos, quando as sementes foram acondicionadas em embalagem impermeável e armazenadas em câmara fria. O comportamento germinativo das sementes armazenadas por dois anos foi comparado com o de sementes recém-colhidas, em temperaturas constante e alternada, não sendo constatado efeito da idade e do regime de temperatura no requerimento fotoblástico das sementes.

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“…Seeds of Asclepias tuberosa and Asclepias viridiflora germinate well at 21°C and light is not an influencing factor (Norman, 1993). Seeds of Matelea maritima germinate at an optimum temperature of 25°C in light, the process being optimized by alternating temperatures of 25/35°C (Cuzzuol and Lucas, 1999). Also, light requirement for germination can vary with temperature (Smith, 1982).…”

mentioning

confidence: 99%

Seed Germination and Early Seedling Growth of Cynanchum bungei Decne (Asclepiadaceae) in Response to Photoperiod, Temperature, and Seed Size

Zhang¹

2012

horts

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Cynanchum bungei Decne is a rare, endemic, and important medicinal plant species in China. Seed germination and early seedling growth of large seeds (greater than 7 mm) and small seeds (smaller than 7 mm) were investigated at three temperatures (15, 20, and 25 °C) in both continuous light and alternating light/dark photoperiods to determine seed propagation requirements. Photoperiod significantly affected seed germination and early seedling growth. Germination and seedling growth at a 12:12-h photoperiod performed better than in continuous light. Temperature had a significant effect on germination index (GI), vigor index (VI), germination velocity (GV), mean germination time (MGT), shoot biomass (SB), root biomass (RB), and taproot length (TL), but no significant effect on final germination percentage (FGP). A temperature of 20 °C was the optimum temperature for seed germination and early seedling growth. Average growth height (AGH) and relative growth rate (RGR) of shoots at 15 °C were greater than that at 20 °C. Large seeds had better germination and seedling performance than small seeds. However, small-seeded seedlings had greater biomass allocated to roots (BAR) and root-to-seedling ratio (RSR) than seedlings from large seeds. Small seeds of C. bungei could be more competent in unfavorable soil and light conditions than large seeds.

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Germinação de sementes de Matelea maritima (Jack.) Woods (Asclepiadaceae)

Cited by 7 publications

References 0 publications

Seed germination of Pilosocereus arrabidae (Cactaceae) from a semiarid region of south‐east Brazil

Seed germination of Pilosocereus arrabidae (Cactaceae) from a semiarid region of south‐east Brazil

Armazenamento e requerimento fotoblástico de sementes de Acacia polyphylla DC

Seed Germination and Early Seedling Growth of Cynanchum bungei Decne (Asclepiadaceae) in Response to Photoperiod, Temperature, and Seed Size

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