Superação de dormência em sementes de Zeyheria montana Mart.

Dousseau, Sara; Alvarenga, Amauri Alves de; Castro, Evaristo Mauro de; Arantes, Lúcio de Oliveira; Nery, Fernanda Carlota

doi:10.1590/s1413-70542007000600021

Cited by 20 publications

(18 citation statements)

References 12 publications

(13 reference statements)

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“…These authors mentioned that field observations point to the hypothesis of an allelopathic effect on other plant species, considering that plants of the same species form homogenous groups and could inhibit the germination of certain seeds and the establishment of others. Dousseau et al (2007) observed a kind of embryonary dormancy in seeds of Zeyera montana Mart. and discussed the possible presence of germination inhibitors, although the authors failed to isolate this inhibiting agent.…”

Section: Shrub/subshrub Speciesmentioning

confidence: 98%

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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Section: Shrub/subshrub Speciesmentioning

confidence: 98%

Seed germination in Cerrado species

Zaidan

Carreira

2008

Braz. J. Plant Physiol.

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“…Devido a escassez de estudos referentes à germinação das sementes dessa espécie, e aliado a crescente demanda pela propagação de espécies medicinais do cerrado (DOUSSEAU et al, 2007;ZAIDAN & CARREIRA, 2008) são necessários maiores esclarecimentos quanto aos fatores que influenciam no processo germinativo. Neste contexto objetivou-se avaliar a influência de diferentes temperaturas, substratos e condições de luminosidade e da secagem na qualidade fisiológica de sementes de gabiroba de arbusto.…”

Section: Introductionunclassified

Ecofisiologia da germinação de sementes de Campomanesia pubescens

et al. 2011

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“…Marçal et al (2014) studied the effect of shading on the emergence and growth of seedlings of Cleopatra mandarin, and found that there was an increase in leaf area when there was increased shading with estimated point of maximum efficiency equal to 50.51 cm 2 in response to shading 61.43%. Dousseau et al (2007) studied the behavior of Tapirira guianensis Alb. subjected to different levels of shading, recording the highest values for leaf area in shading of 30% to 70%.…”

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Seedling emergence of five varieties of citric rootstocks grown in environments with different levels of shading

Martins¹,

Coelho²,

Marçal³

et al. 2014

Plant Sci Today

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The emergence of citrus seedlings is influenced by several factors. One is the degree of brightness. The objective of the experiment was to evaluate the influence of four environments in the emergence of seedlings of five citrus varieties rootstocks. The work was carried out on private property located in the city of Alegre-ES, located at 20° 49' south latitude and 41° 32' west longitude and 322 m altitude. The experimental design was completely randomized in a split plot, with four rooms consisting of 0, 30, 50 and 80% shading in the plot and five varieties of rootstocks subplots, with four repetitions and twenty-five seeds per replicate. The rootstocks used were the Rangpur lime, lemon Volkameriano, Poncirus trifoliata, 'Swingle' citrumelo and Flying Dragon. After 60 days of sowing, emergence rate index, emergence percentage, leaf number and height were evaluated. At 124 days, leaf area, total chlorophyll (a + b), root dry mass and shoot were evaluated. The citric rootstocks tested responded differently when subjected to shading, and can use physiological and morphological mechanisms to maintain or even improve the emergence and seedling vigor. It was observed that the P. trifoliata rootstock obtained better performance when compared to others and that 50% shading can be adopted in this stage of citrus seedling production since it reduces seedling time in the tubes and does not affect the seedling quality.

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Superação de dormência em sementes de Zeyheria montana Mart.

Cited by 20 publications

References 12 publications

Seed germination in Cerrado species

Seed germination in Cerrado species

Ecofisiologia da germinação de sementes de Campomanesia pubescens

Seedling emergence of five varieties of citric rootstocks grown in environments with different levels of shading

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