scholarly journals Gibberellic acid promotes dormancy-breaking of rice seeds and the formation of abnormal seedlings

2021 ◽  
Vol 20 (4) ◽  
pp. 278-285
Author(s):  
Jaquelini Garcia ◽  
Camile Thais Castoldi ◽  
Gisiane Camargo de Andrade ◽  
Cileide Maria Medeiros Coelho ◽  
Virgílio Gavicho Uarrota
Keyword(s):  
Gibberellic Acid ◽  
Dormancy Breaking ◽  
Rice Seeds

O arroz é uma das espécies que apresenta dormência após a colheita, podendo esta ser prolongada durante o armazenamento das sementes. Este trabalho teve por objetivo determinar se o ácido giberélico (GA3) é um promotor eficiente da superação de dormência em sementes de arroz e avaliar mudanças nas estruturas biológicas via histoquímica. A cultivar utilizada foi a SCS122 Miura submetida a 0 mg L-1, 500 mg L-1 e 1000 mg L-1 de GA3. Foram realizadas análises de germinação, viabilidade, comprimento de raiz, parte aérea e plântula, microscopia óptica do amido e quantificação dos açúcares solúveis totais. A utilização de 500 mg L-1 e 1000 mg L-1 de GA3 foi eficiente para a superação da dormência de sementes de arroz, reduzindo o percentual de sementes dormentes para 4% e 1% respectivamente. Apesar de reduzir o percentual dormência, a presença de GA3 provoca aumento do percentual de plântulas anormais, e por isso, nas concentrações utilizadas, não pode ser recomendado como método de superação em sementes de arroz. A microscopia óptica é eficiente para verificar que com a superação de dormência, ocorre a degradação dos grânulos de amido, aumentando a disponibilidade de açúcares solúveis totais para o crescimento e desenvolvimento de plântulas.

Germination response to phytochrome depends on specific dormancy states in wild oat (Avena fatua)

1993 ◽  
Vol 71 (11) ◽  
pp. 1528-1532 ◽  
Author(s):  
J. Q. Hou ◽  
G. M. Simpson
Keyword(s):  
Relative Humidity ◽  
Gibberellic Acid ◽  
Red Light ◽  
Avena Fatua ◽  
Mechanical Injury ◽  
Wild Oat ◽  
Dormancy Breaking ◽  
Negative Effects ◽  
Germination Response ◽  
Genetic Origins

Effects of brief red and far-red light on germination of seeds from dormant lines of wild oat (Avena fatua L.) were studied in combination with mechanical injury to the seed coat, application of gibberellin A3, or changes in relative humidity during afterripening. Aberrant germination responses to phytochrome action were observed in the mechanically injured seeds in some of the lines, i.e., brief red light inhibited or delayed germination induced by injury, and immediately following far-red light cancelled the negative effects. Phytochrome action influenced germination of the gibberellin-treated seeds in a normal fashion, although effects of the gibberellic acid and brief red light on germination were not additive. Brief red light inhibited germination of seeds afterripened in zero relative humidity; the same light promoted germination of those in 30 and 60% relative humidity. Germination response to phytochrome in wild oat depends on specific seed dormancy states, illustrated by genetic origins, dormancy-breaking methods and afterripening conditions. Key words: Avena fatua, dormancy, mechanical injury, gibberellin A3, phytochrome, relative humidity.

scholarly journals Gibberellic Acid-Enhanced Synthesis and Excretion of Phosphatase lsozymes by Embryoless Rice Seeds

1970 ◽  
Vol 83 (980-981) ◽  
pp. 82-85 ◽  
Author(s):  
Shoho SUZUKI ◽  
Saheye NAKAMURA ◽  
Kazutosi NISIZAWA
Keyword(s):  
Gibberellic Acid ◽  
Rice Seeds

scholarly journals Effect of chemical treatments used for dormancy breaking on the number of stems and tubers of Hungarian potato varieties

2020 ◽  
Vol 24 (2) ◽  
Author(s):  
Ádám Esztergályos ◽  
Zsolt Polgár
Keyword(s):  
Gibberellic Acid ◽  
Vegetation Period ◽  
Climatic Conditions ◽  
Dormancy Breaking ◽  
Tuber Dormancy ◽  
Potato Varieties ◽  
Chemical Treatments ◽  
Dormancy Period ◽  
Breaking Dormancy ◽  
Number Of Stems

The length of tuber dormancy of potato varieties is an important factor in the profitability of the potato sector. Under temperate climatic conditions longer dormancy is more advantageous. However, in case of multiple planting within one growing season, in seed multiplication programs or during rapid post-harvest disease testing, breaking or shortening of dormancy is often needed. Numerous ways for chemical regulation of dormancy period were developed, but the efficiency of such methods is strongly genotype dependent. Recently a comparative study of chemical treatments for breaking tuber dormancy of some new Hungarian potato varieties was carried out. Continuing this work, here we report about the effects of chemical treatments used for breaking dormancy on the number of stems and tubers of progeny plants. The experiment was conducted in three consecutive vegetation period, with three varieties having different maturity type and different dormancy period: Balatoni rózsa, Botond and Démon. Treatments were performed using gibberellic-acid, benzyl-adenine and Rindite in different concentrations and combinations. After the dormancy period, tubers were planted into pots and grown under controlled conditions. Number of developed stems and tubers was counted. According to the results, applied treatments had a large effect on the number of developing stems and tubers of the progeny plants. Combined treatments of Rindite+gibberellic-acid, and gibberellic-acid at 100 ppm increased significantly the number of stems and tubers. Correlation between the efficiency of dormancy breaking and the number of developed tubers was found. Based on our data, Rindite and gibberellic-acid have an important role not only in breaking dormancy, but also in increasing the tuber number/plant. This positive effect could be utilized in seed potato production.

scholarly journals CHEMICAL MANIPULATION OF GRAPE DORMANCY UNDER SIMULATED TROPICAL CONDITIONS

HortScience ◽  
1995 ◽  
Vol 30 (3) ◽  
pp. 435g-436
Author(s):  
Frank B. Matta ◽  
Obadiah M. Njue
Keyword(s):  
Gibberellic Acid ◽  
Dormancy Breaking ◽  
Ammonium Thiosulfate ◽  
Tropical Conditions ◽  
Concord Grapes

Defoliating chemicals (ammonium thiosulfate, ethrel, and thidiazuron) were evaluated on 8-month-old `Canadice' and `Concord' grapes. The effectiveness of chemical defoliators was determined 20 days after application. Vines were pruned after defoliation and dormancy breaking chemicals (thiourea, cyanamide, and gibberellic acid (GA3) were applied 4 days later. All treatments were applied as sprays. All chemicals were effective in defoliating the vines of both cultivars. Generally, the higher concentrations (ammonium thiosulfate, ethrel, and thidiazuron at 15.15, 3.0, and 0.35 g·liter–1, respectively) were more effective. All chemicals reduced days to maximum budbreak of both cultivars. The higher concentrations (thiourea, cyanamide, and GA3 at 30.3, 15.15, and 0.75 g·liter–1, respectively) resulted in greater reductions in days to maximum budbreak. `Concord' was later in reaching maximum budbreak. Total percent budbreak of both cultivars was increased by all chemicals at the higher concentrations. Cyanamide resulted in greater total percent budbreak in both cultivars.

scholarly journals Comparative Evaluation of the Effects of Gibberellic Acid Concentrations on Dormancy Break in Tubers of Solanum chacoense

2020 ◽  
Vol 30 (1) ◽  
pp. 76-81
Author(s):  
Christian T. Christensen ◽  
Lincoln Zotarelli ◽  
Kathleen G. Haynes ◽  
Charles Ethan Kelly
Keyword(s):  
Gibberellic Acid ◽  
Solanum Chacoense ◽  
Alternative Methods ◽  
Average Weight ◽  
Dormancy Breaking ◽  
Tuber Dormancy ◽  
Department Of Agriculture ◽  
Time Treatment ◽  
Sprout Length ◽  
Breaking Dormancy

Solanum chacoense is a wild relative of potato (Solanum tuberosum) that is of interest because of its many desirable traits, but it exhibits variations in tuber dormancy across accessions. The objective of this study was to determine an appropriate gibberellic acid (GA3) concentration and soak time treatment to encourage sprout development across four accessions of S. chacoense (A, B, C, and D) from the 174 accessions of the U.S. Department of Agriculture Potato Genebank. Twelve treatments were created by using four concentrations of GA3 (0, 50, 100, and 150 μg·mL−1) across three soak periods (5, 45, and 90 minutes). Small (average weight, 1.4 g), medium (2.6 g), and large (5.6 g) tubers were distributed among all treatments. Percentage of tubers sprouted, time to sprouting, sprout length, and sprout number per tuber were analyzed to determine the effectiveness of GA3 treatments on dormancy breaking. GA3 concentrations of 50, 100, and 150 μg·mL−1 partially broke dormancy within accessions B and C. None of the tested treatments were effective for breaking dormancy in accession D within 46 days after treatment. Accession A showed weaker dormancy, thus producing a similar percentage of sprouted tubers across all GA3 treatments. Soak time had no significant effect on all parameters measured. Larger tubers produced greater sprout number per tuber and percentages of sprouted tubers. Soaking tubers in 50 μg·mL−1 of GA3 may be an effective treatment for S. chacoense accessions with mild dormancy, but alternative methods to break dormancy may be required for S. chacoense accessions with stronger dormancy.

scholarly journals Expression of abscisic and gibberellic acid signalling factors in Fagus sylvatica L. seeds during dormancy breaking and germination

Dendrobiology ◽  
2019 ◽  
Vol 81 ◽  
pp. 22-30
Author(s):  
Aleksandra Maria Staszak ◽  
Emilia Pers-Kamczyc ◽  
Ewelina Anna Klupczyńska ◽  
Tomasz Andrzej Pawłowski
Keyword(s):  
Gibberellic Acid ◽  
Fagus Sylvatica ◽  
Dormancy Breaking ◽  
Fagus Sylvatica L

scholarly journals Techniques for breaking seed dormancy of rainforest species from genus Acronychia

2020 ◽  
Vol 48 (2) ◽  
pp. 159-165
Author(s):  
Ganesha S. Liyanage ◽  
Catherine A. Offord ◽  
Karen D. Sommerville
Keyword(s):  
Gibberellic Acid ◽  
Seed Dormancy ◽  
Seed Coat ◽  
Similar Pattern ◽  
Dormancy Breaking ◽  
Eastern Australia ◽  
Radicle Emergence ◽  
Breaking Seed Dormancy ◽  
Impermeable Seed Coat

We tested for dormancy in three species of Acronychia (Rutaceae) occurring in the rainforest in eastern Australia, A. imperforata, A. laevis and A. oblongifolia, by incubating fresh intact seeds on 0.8% water agar for one month at 25/10°C. Four different techniques were then tested for their effect on dormancy: (i) incubation of intact seeds on agar incorporating gibberellic acid (GA3); (ii) seed coat removal (decoating); (iii) scarification near the radicle emergence point (scarification-emergence point); and (iv) scarification opposite the radicle emergence point (scarification-back). Imbibition tests were performed to determine whether dormancy was due to an impermeable seed coat. Germination differed among treatments, but all three species showed a similar pattern. Intact seeds showed < 6% germination after one month indicating the presence of dormancy. Highest germination (> 65%) was observed following scarification-emergence point treatment. Seed coat removal also resulted in increased germination (40-47%), in comparison with intact seeds, but GA3 and scarification-back treatments did not (< 12%). Though the seedcoats of all species were permeable, increased germination responses to decoating and scarification-emergence point treatments suggest scarification is required to clear the radicle emergence point. This may be a useful dormancy-breaking technique for Acronychia spp. and may be suitable for related Rutaceae species.

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