H<scp>OW</scp>G<scp>IBBERELLIN</scp>R<scp>EGULATES</scp>P<scp>LANT</scp>G<scp>ROWTH AND</scp>D<scp>EVELOPMENT</scp>: A Molecular Genetic Analysis of Gibberellin Signaling

Richards, Donald E.; King, Kathryn E.; Aït-Ali, Tahar; Harberd, Nicholas P.

doi:10.1146/annurev.arplant.52.1.67

Cited by 478 publications

(372 citation statements)

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“…Gibberellin induces seed germination and promotes hypocotyl and stem elongation (PENG; HARBERD, 2000;RICHARDS et al, 2001). The use of growth regulators…”

Section: Introductionmentioning

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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“…Gibberellin induces seed germination and promotes hypocotyl and stem elongation (PENG; HARBERD, 2000;RICHARDS et al, 2001). The use of growth regulators…”

Section: Introductionmentioning

confidence: 99%

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

Malavasì

Dias²,

Malavasi

2011

CERNE

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“…Specific roles of GA include the induction of seed germination, promotion of hypocotyls, stem elongation, regulation of pollen development and flower initiation, and wood formation (Mauriat and Moritz 2009;Richards et al 2001;Ritchie and Gilroy 1998). Many previous studies have shown that exogenous GA reduces the minimum effective exposure time to the germination stimulant and promotes seed germination (Chae et al 2004;Song et al 2005a, b).…”

Section: Introductionmentioning

confidence: 99%

Germination, osmotic adjustment, and antioxidant enzyme activities of gibberellin-pretreated Picea asperata seeds under water stress

et al. 2009

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Germination of dragon spruce (Picea asperata Mast.) seeds pretreated with gibberellin (GA) in response to water stress and changes in the levels of osmotic adjustments as well as in activities of antioxidant enzymes were investigated. With decreasing water potential caused by increasing concentrations of PEG 6000, germination percentage and germination index decreased gradually; the decrease was especially prominent under the serious water stress from PEG -0.6 MPa. In contrast, osmotic regulation substances (free proline and soluble sugar contents), lipid peroxidation (MDA), and activities of antioxidant enzyme (ascorbate peroxidase, catalase, and peroxidase) increased markedly with decreased water potential. Similarly, the values in all parameters under -0.6 MPa PEG treatment were markedly higher than the control and -0.2 MPa PEG treatment. These results suggested that P. asperata seed germination was insensitive to water stress. In addition, seeds pretreated with GA had increased tolerance to water stress as measured by germination percentage and germination index, osmotic regulation substance, and antioxidant enzyme activities.

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“…A giberelina, importante regulador endógeno de crescimento, produz diversos efeitos sobre o crescimento e desenvolvimento, destacando-se indução da germinação em sementes, promoção do alongamento do hipocótilo e caule e regulação do desenvolvimento do pólen e indução floral (Peng e Harberd, 2000;Richards et al, 2001). Respostas variadas à aplicação de ácido giberélico (GA 3 ) na germinação de sementes foram verificadas por Perez-Garcia e Durán (1990) em Onopordum nervosum Boiss.…”

Section: Introductionunclassified

Efeito da pré-embebição e aplicação de ácido giberélico na germinação de sementes de macela

Bezerra

Filho

Bruno

et al. 2006

Rev. bras. sementes

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RESUMO -O trabalho teve o objetivo de avaliar o efeito da ação conjunta da pré-embebição e da aplicação de ácido giberélico na germinação de sementes de macela (Egletes viscosa (L.) Less.). Os tratamentos foram dispostos em arranjo fatorial 3x3 (pré-embebição das sementes em água por 0, 24 e 48h e, umedecimento do substrato com ácido giberélico-GA 3 nas concentrações de 0, 100 e 300ppm) no delineamento inteiramente casualizado, com quatro repetições. As sementes foram colocadas para germinar sobre papel, em placas de Petri, de 9cm de diâmetro, forradas com dois discos de papel de filtro (50 sementes/repetição), com quantidade inicial de água (0ppm de GA 3 ) ou solução aquosa de GA 3 (100 e 300ppm) equivalente a duas vezes o peso do papel. As placas foram colocadas em uma câmara de germinação, a temperatura alternada de 20-30°C e fotoperíodo de 8h de luz e 16h de escuro, efetuando-se contagens diárias, do 5° até o 40° dia após a semeadura, para determinação da porcentagem, velocidade e tempo médio de germinação. A pré-embebição das sementes em água (24 e 48h) ou o umedecimento do substrato com GA 3 (100 ou 300ppm) aumenta a porcentagem e velocidade de germinação e reduz o tempo médio de germinação.Termos para indexação: Egletes viscosa, planta medicinal, pré-tratamento, qualidade fisiológica. EFFECT OF PRE-SOAKING AND GIBERELIC ACID APPLICATION ON Egletes viscosa SEEDS GERMINATIONABSTRACT -. The experiment was the simultaneous evaluation of the effect of pre-soaking with water and giberelic acid application on macela (Egletes viscosa) seed germination. The treatments were disposed in a factorial arrangement 3x3 (pre-soaking of the seeds with water for 0, 24 and 48 hours and moistening of the substract with giberelic acid -GA 3 , at the concentrations of 0, 100 and 300ppm) in a completely randomized design, with four replications. The seeds were sown for germination on filter paper, in 9 cm diameter Petri plates, lined with two filter paper disks (50 seeds per plate), with a initial amount of water (0ppm of GA 3 ) or aqueous GA 3 solution (100 and 300ppm), equivalent to two times the paper weight. The plates were stored in a germination chamber, with alternated temperature of 20-30°C and photoperiod of 8 hours under light, 30°C, and 16 hours of darkness, 20°C. Daily countings were made for 40 days after the sowing in order to determine the percentage, rate and the average time of germination. The analysis of the obtained results permitted the conclusion that pre-soaking the seeds in the water (24 and 48h) and the substrate humidification with GA 3 (100 and 300ppm) increased the germination percentage and rate and reduced the average germination time.

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HOWGIBBERELLINREGULATESPLANTGROWTH ANDDEVELOPMENT: A Molecular Genetic Analysis of Gibberellin Signaling

Cited by 478 publications

References 103 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

Germination, osmotic adjustment, and antioxidant enzyme activities of gibberellin-pretreated Picea asperata seeds under water stress

Efeito da pré-embebição e aplicação de ácido giberélico na germinação de sementes de macela

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