Germination of seeds from herbaceous plants artificially stored in cerrado soil

Sassaki, Regina Miyuki; Rondon, Josimara Nolasco; Zaidan, Lilian Beatriz Penteado; Felippe, G. M.

doi:10.1590/s0034-71081999000200011

Cited by 24 publications

(36 citation statements)

References 7 publications

(7 reference statements)

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“…Similar results were obtained by Sassaki et al (1999), who stored Psychotria barbiflora fruit in cerrado soil for up to 7 months and reported that, the longer the period of storage in soil the lower the germination of exhumed seeds, with a decrease of seed viability. In exhumed Psychotria vellosiana seeds from 5 cm depth both in an open and shaded environment, the decrease of the seed germination was not accompanied by a reduction in the seed viability, whereas in seeds retrieved from 15 cm depth, both viability and germination decreased with storage time, although viability diminished less sharply as compared to germination.…”

Section: Assaysupporting

confidence: 86%

“…Such results are compatible with Paz et al (1999) who reported that the germination of the tree species, Psychotria limonensis and Psychotria simiarum sowed in the field in a tropical rain forest was similar in gaps and shaded habitats. A reason for the higher germination of exhumed seeds may be that they were partially hydrated in the cerrado soil as shown by Sassaki et al (1999) who reported that the water content of Psychotria barbiflora seeds was higher (11 -17%) in seeds stored in cerrado soil than the seeds dry-stored at 4 °C. The moisture levels of the soil stored Psychotria barbiflora seeds (11 -17%) were similar to the Psychotria vellosiana seeds soaked in distilled water (15% -20%).…”

Section: Assaymentioning

confidence: 99%

See 1 more Smart Citation

Storage in cerrado soil and germination of Psychotria vellosiana (Rubiaceae) seeds

Araújo

Cardoso²

2006

Braz. J. Biol.

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The regeneration of plant communities from seed depends, to a large extent, on the capacity of the seed remaining viable in the soil. The viability and germination of artificially buried Psychotria vellosiana seeds in cerrado soil were studied, with the purpose of discovering some physio-ecological aspects of dispersed seeds and evaluating their potential to constitute a soil seed bank. Seed samples were placed in nylon envelopes and buried in the soil of a Cerrado reserve at two different depths and sites. Buried seeds were retrieved periodically and tested for germination along with dry-stored seeds. In general, there was a reduction in seed germination with storage time, both in soil and dry stored conditions, and in some assays exhumed seeds germinated faster than dry stored ones. In general the soil storage favoured seed viability of ungerminated seeds as compared to dry stored ones, with the seeds remaining partially viable after 10 months of storage. The lack of germination of viable seeds suggests that seeds showed true dormancy and/or required an extended time to germinate. It was observed that some seeds had germinated while buried and such in situ germination tended to increase with rainfall. The water availability in the soil might be a limiting factor for successful germination of P. vellosiana in the field, and the seeds may constitute a persistent soil seed bank in the cerrado as dispersed seeds remain viable in the soil until the following period of seed dispersal.Keywords: Psychotria vellosiana, dormancy, physio-ecology, dispersal units. RESUMO

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Section: Assaysupporting

confidence: 86%

Section: Assaymentioning

confidence: 99%

Storage in cerrado soil and germination of Psychotria vellosiana (Rubiaceae) seeds

Araújo

Cardoso²

2006

Braz. J. Biol.

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“…In apparently viable achenes of E. elaeagnus E. glomerulatus, about 91% and 70%, respectively, had no embryos (Velten and Garcia, 2005). In V. herbacea, 15% of the achenes did not have viable embryos according to the tetrazolium test (Sassaki et al, 1999a).…”

Section: Herbaceous Speciesmentioning

confidence: 95%

“…The period of storage, both in the soil and in refrigerator at 4°C, affected the photoblastism of the seeds of Psychotria barbiflora DC. In this species, newly collected seeds are positively photoblastic but become indifferent to light during storage (Sassaki et al, 1999a).…”

Section: Herbaceous Speciesmentioning

confidence: 97%

Seed germination in Cerrado species

Zaidan

Carreira

2008

Braz. J. Plant Physiol.

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The aim of this review is to comment on the available data about germination of seeds from herb, shrub and tree species of the Cerrado after the publication of the review written by Felippe and Silva in 1984. Studies on seed germination of herbaceous species focused mainly on the responses of seeds to light, different ranges of temperature and storage in the soil. The majority of seeds from herb species germinate between 20°C and 30°C, and are photoblastic. Alternate temperatures favored germination in some seeds, but changed light sensitivity of the achenes of Bidens gardneri. Seeds of most of the shrub species of Melastomataceae are positive photoblastic; among the Velloziaceae, germination in the dark was observed in some species. Other shrub species show dormancy caused by impermeability of the seed tegument, as described for seeds of some species of Bauhinia. Their dormancy is broken by chemical scarification using sulphuric acid. Seeds of Heteropterys pteropetala are sensitive to very high temperatures, similar to those registered during burnings. Some species were considered to have allelopathic effects and could inhibit the germination of seeds of other species and the establishment of plantlets. Seeds of most tree species do not require light to germinate and the focus of the studies were on methods of dormancy breaking. Sulphuric acid and incisions in the tegument proved to be the most efficient methods to break dormancy. In general, the studies are limited to three major aspects: responses to light, effects of different temperatures and dormancy breaking. More studies are necessary to understand the physiological and biochemical aspects of reserve compounds and their mobilization during germination, as well as the effects of fire in these seeds. Key words: dormancy, photoblastism, soil seed bank, temperature Germinação de sementes de espécies de Cerrado: O objetivo desta revisão é comentar dados disponíveis sobre a germinação de sementes de espécies herbáceas, arbustivas e arbóreas do Cerrado, desde a publicação da revisão feita por Felippe e Silva na década de 1980. Estudos de germinação de sementes de espécies herbáceas do Cerrado enfatizam as respostas das sementes à luz, temperatura e armazenamento no solo. A maioria dessas sementes germina entre 20ºC e 30ºC e são fotoblásticas. Temperaturas alternadas nem sempre favoreceram a germinação das sementes, no entanto, alteraram a sensibilidade à luz em aquênios de Bidens gardneri. A maioria das sementes das espécies arbustivas de Melastomataceae estudadas apresentaram fotoblastismo positivo; entre as Velloziaceae, foi observada germinação no escuro em algumas espécies. Sementes de algumas espécies arbustivas possuem dormência causada pela impermeabilidade do tegumento, quebrada com imersão em ácido sulfúrico, como no gênero Bauhinia. Sementes de Heteropterys pteropetala são sensíveis a temperaturas altas, similares àquelas registradas durante as queimadas. Plantas de algumas espécies têm efeitos alelopáticos e podem inibir a germinação de sementes de o...

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“…Felippe (1990) showed that the species presents light sensitivity when germination is studied at 25°C; with a long storage period in dry conditions at 4°C (up to 14 months) the achenes lose their light sensitivity and readily germinate in darkness. Lon-gevity of achenes stored at 4°C lasted for a long time; when stored for up to eight years 6% of the achenes did germinate (Sassaki et al 1999b). B. gardneri presents heteroblastism, producing long and short achenes; germination in light was high when long achenes were used and very low with short achenes (Felippe 1990).…”

Section: Introductionmentioning

confidence: 99%

Effects of moisture content and temperature during storage on germination of the achenes of Bidens gardneri Baker

Rondon¹,

Sassaki²,

Zaidan³

et al. 2001

Rev. bras. Bot.

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-(Effects of moisture content and temperature during storage on germination of the achenes of Bidens gardneri Baker). Bidens gardneri is a herbaceous species of the cerrados, whose seeds are light sensitive at 25°C, but they become indifferent to light when stored in soil. In this work the effects of moisture content, temperature and light (during storage) upon light sensitivity during germination were studied. Ripe achenes were collected in the cerrados of Itirapina and Moji Guaçu, State of São Paulo, Brazil. The storage conditions of the achenes varied in each experiment. Achenes were stored in darkness or light, in closed bottles, at 4°C, 20/30°C or 25°C. Achenes were imbibed for 24 h at 4°C, 25°C or 20/30°C (in darkness) and then stored for 1, 10, 20, 30 and 40 days (40 days only for 4°C and 25°C). Germination tests were conducted at 25°C and 20/30°C. The achenes not previously imbibed showed sensitivity to light during germination. High moisture content did not affect light sensitivity of the achenes during germination but high moisture content together with storage temperatures of 25°C and 20/30°C had a deleterious effect upon the longevity of the achenes. Alternate temperatures during germination did not change the light sensitivity of newly collected achenes from Itirapina but changed the light sensitivity of the achenes stored imbibed at 4°C in darkness. Alternate temperatures during storage of achenes with low moisture content did not change their photoblastism when germination was carried out at 25°C. Alternate temperatures during storage of achenes with high moisture content followed by alternate temperatures during germination changed the light sensitivity of the achenes.RESUMO -(Efeito do conteúdo de água e temperatura durante o armazenamento na germinação dos aquênios de Bidens gardneri Baker). Bidens gardneri é uma espécie herbácea dos cerrados, cujas sementes são fotoblásticas positivas a 25°C, mas tornam-se indiferentes à luz quando armazenadas em solo. Neste trabalho, foram estudados os efeitos do conteúdo de água dos aquênios, da temperatura e da luz (durante o armazenamento) na sensibilidade à luz durante a germinação. Os aquênios foram coletados nos cerrados de Itirapina e de Moji Guaçu, estado de São Paulo, Brasil. As condições de armazenamento variaram em cada experimento. Os aquênios foram armazenados no escuro ou em luz, em vidros fechados a 4°C, 25°C e 20/30°C. Os aquênios foram embebidos por 24 horas a 4°C, 25°C e 20/30°C (no escuro) e então armazenados por 1, 10, 20, 30 e 40 dias (40 dias somente para 4°C e 25°C). Os testes de germinação foram conduzidos a 25°C e 20/30°C. Os aquênios que não foram embebidos apresentaram sensibilidade à luz durante a germinação. O conteúdo alto de água durante o armazenamento não afetou a resposta à luz dos aquênios durante a germinação, mas o conteúdo alto de água em temperaturas de armazenamento de 25°C e 20/30°C tiveram efeito deletério na longevidade dos mesmos. As temperaturas alternadas durante a germinação não alteraram a resposta à lu...

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Germination of seeds from herbaceous plants artificially stored in cerrado soil

Cited by 24 publications

References 7 publications

Storage in cerrado soil and germination of Psychotria vellosiana (Rubiaceae) seeds

Storage in cerrado soil and germination of Psychotria vellosiana (Rubiaceae) seeds

Seed germination in Cerrado species

Effects of moisture content and temperature during storage on germination of the achenes of Bidens gardneri Baker

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