Estresse hídrico e reguladores de crescimento na germinação de sementes de canafístula

Botelho, Beatriz Amoroso; Gualtieri, Sônia Cristina Juliano

doi:10.1590/s0103-90162001000100008

Cited by 20 publications

(15 citation statements)

References 14 publications

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“…Still with Passifl ora alata, Ferreira (1998) observed that GA 3 at 100 mg L -1 promoted better germination, while with Passifl ora nitida Passos et al (2004) reported that for in vitro germination the most suitable gibberellic acid concentration was 1000 mg L -1 , with or without luminosity. Botelho and Perez (2001) reported signifi cant effects on the germination percentage and speed with seeds of Peltophorum dubium Spreng (Taubert). With seeds of Jatropha elliptica, Añez et al (2006) found higher germination percentages in treatments using gibberellic acid at concentrations of 300 to 500 ppm.…”

Section: Malavasi M De M Et Almentioning

confidence: 99%

Effect of gibberellic acid and temperature on germination of Vitex montevidensis Cham

Malavasì

Dias²,

Malavasi

2011

CERNE

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This work aims to evaluate treatments that may help improve speed and uniformity of germination in fruit tree species tarumã. Data were obtained from pyrenes (stones) of ripe fruits which in turn were picked from adult trees in the municipality of Vera Cruz do Oeste-PR. Treatments consisted of applying GA 3 solutions at various concentrations (zero, 50 mg L -1 , 100 mg L -1 or 200 mg L -1 ) to pyrenes via immersion for 47 hours, and thermoperiods of alternate 20ºC and 30ºC (8 hours at 20ºC in light conditions, and 16 hours at 30ºC in dark conditions) and constant 30ºC with the same photoperiod. The combination of alternate temperatures of 20ºC and 30ºC with a 200 mg L -1 GA 3 solution resulted in an increase both in germination percentage, from 19.2% to 56.2%, and in the germination speed index, from 0.19 to 3.12, with resulting normal, uniform seedlings.

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Section: Malavasi M De M Et Almentioning

confidence: 99%

Effect of gibberellic acid and temperature on germination of Vitex montevidensis Cham

Malavasì

Dias²,

Malavasi

2011

CERNE

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“…Seeds of P. dubium are temperature-resistent: exposition for 24 hours at 45ºC is sufficient to break the mechanical dormancy imposed by the tegument (Perez et al, 1998). Gibberellic acid allows an increase in the maximum tolerance to water stress especially in the presence of putrescin and espermidin, growth regulating substances that modulate some biological process such as cell division, responses to stressing factors and developmental processes (Botelho and Perez, 2001). Seeds of P. nitens are resistant to water stress and to several salt solutions (Nassif and Perez, 1997a).…”

Section: Tree Speciesmentioning

confidence: 99%

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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“…The authors recommend, in order to choose the best dose, to analyze to which market segment the product will be directed. present in the formula of Stimulate, cytokinin promotes cell division and differentiation, stimulating lateral buddings and greater leaf expansion (Reghin et al, 2000), auxin stimulates elongation and cellular differentiation of phloem and xylem, also favoring formation and development of floral organs (Davies, 2004), and gibberellin favors germination and growth by lengthening (Botelho et al, 2001).…”

Section: Introductionmentioning

confidence: 99%

Physiological and agronomic traits of cabbage plants hybrid Fuyutoyo ® sprayed with plant growth regulators

et al. 2017

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In this study we aimed to evaluate the effect of using the mixture of plant growth regulators auxin, gibberellin and cytokinin in the physiological behavior and productive components of cabbage plants hybrid Fuyutoyo®. The experimental design was completely randomized, with four replications, evaluating five doses of the mixture of plant growth regulators, in the form of the commercial product Stimulate® (0, 50, 100, 150 and 200 mL p.c./100 L H2O). The spray applications of plant growth regulators started when the plants presented 7-8 expanded leaves, carried out fortnightly, totaling five applications along the cycle. The authors evaluated gas exchange measures; fresh mass, diameter and firmness of “heads”; and number of leaves. The study concluded that applications of 200 mL of the mixture of plant growth regulators p.c/100 L H2O promoted higher photosynthetic yield (21.40 µmol CO2/m2/s), and fresh mass (3.46 kg), vertical and horizontal diameter (13.23 and 16.61 cm), number of leaves (30.95) and firmness of the “head” (54.48 N). The authors recommend, in order to choose the best dose, to analyze to which market segment the product will be directed.

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Estresse hídrico e reguladores de crescimento na germinação de sementes de canafístula

Cited by 20 publications

References 14 publications

Effect of gibberellic acid and temperature on germination of Vitex montevidensis Cham

Effect of gibberellic acid and temperature on germination of Vitex montevidensis Cham

Seed germination in Cerrado species

Physiological and agronomic traits of cabbage plants hybrid Fuyutoyo ® sprayed with plant growth regulators

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