Superação da dormência de sementes de Brachiaria brizantha cv. “Marandu”

Lacerda, Maria Juliana Ribeiro; Cabral, Juliana Silva Rodrigues; Sales, Juliana de Fátima; Freitas, Karina Rocha; Fontes, Antônio João

doi:10.5433/1679-0359.2010v31n4p823

Cited by 17 publications

(17 citation statements)

References 5 publications

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“…However, there is still a lack sufficient clarity regarding this dormancy imposed on the seeds of most brachiaria, in terms of its characteristics, potency and persistence over time. Besides, it must be emphasized that the efficiency of the methods employed to overcome dormancy varies, depending on several factors (LACERDA et al, 2010).…”

Section: Introductionmentioning

confidence: 99%

Potassium nitrate on overcoming dormancy in Brachiaria humidicola ‘BRS Tupi’ seeds

et al. 2017

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Section: Introductionmentioning

confidence: 99%

Potassium nitrate on overcoming dormancy in Brachiaria humidicola ‘BRS Tupi’ seeds

et al. 2017

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“…Marandu, a quebra da dormência foi mais significativa quando utilizou acido giberélico. Discordando de Lacerda et al (2010) que observaram que a imersão em água fervente foi mais eficientes para superar a dormência de Urochloa brizantha cv. Marandu do que o ácido giberélico e ácido sulfúrico.…”

Section: Resultsunclassified

AVALIAÇÃO DA DORMÊNCIA DE Urochloa humidicola CV. LLANERO SOB DIFERENTES DOSES DE ÁCIDO GIBERÉLICO E PACLOBUTRAZOL

Sorigotti¹,

Garcia²,

Custódio³

et al. 2016

COLLOQ AGRARIAE

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RESUMOO objetivo foi avaliar a germinação e dormência das sementes de U. humidicola cv. Llanero em diferentes concentrações de ácido giberélico e paclobutrazol, utilizando sementes intactas e sementes nuas (cariopses). Utilizou-se diferentes soluções para embebição do substrato. As soluções de ácido giberélico (GA 3 ) foram: 0 (água pura); álcool 5%; 0,50 mM L -1 ; 1,0 mM L -1 ; 2,0 mM L -1 e 4,0 mM L -1 e de paclobutrazol (PBZ): 0; 0,05 g L -1 ; 0,100 g L -1 e 0,200 g L -1 . Avaliou-se a germinação por protrusão de raiz primária, índice de velocidade de germinação e a porcentagem de dormência das sementes. Os dados foram analisados pelo teste F e o teste de Tukey para comparação de médias. O GA 3 favorece a germinação das sementes intactas, porém para a germinação do cariopse não há influência do ácido giberélico. O PBZ não inibe a germinação das sementes nuas. A germinação esta relacionada à outros fatores, além do balanço de giberelinas nas sementes. Palavras-chave: Germinação; Giberelina; Inibidor da giberelina; Triazol; Urochloa. EVALUATION DORMANCY Urochloa humidicola CV. LLANERO UNDER DIFFERENT ACID DOSES GIBBERELLIC AND PACLOBUTRAZOLThe objective was to evaluate the germination and dormancy of U. humidicola seeds cv. Llanero in different concentrations of gibberellic acid and paclobutrazol using intact seeds and naked seeds (caryopses). Different solutions are used for soaking the substrate. The solution of gibberellic acid (GA3) were: 0 (pure water) ; 5% alcohol; 0.50 mM L-1; 1.0 mM L-1; 2.0 mM L-1 and 4.0 mM L-1 and paclobutrazol (PBZ): 0; 0.05 g L-1 ; 0.100 g L-1 and 0.200 g L-1 . We evaluated the germination protrusion of primary root, germination speed index and the percentage of seed dormancy. Data were analyzed by F test and Tukey test to compare means. The GA3 favors the germination of intact seeds, but for the germination of caryopses there is no influence of gibberellic acid. The PBZ does not inhibit the germination of naked seeds. Germination is related to other factors and the balance of gibberellins in the seeds.

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“…Thus, mechanical scarification presents advantages by removing the external structures of the seeds, facilitating gas exchange by the seeds (Zuffo et al, 2014). In addition to the scarification methodologies, researches that evaluates the dormancy overcoming process of forage grass seeds, has considered the action of high temperatures and high humidity (Pereira et al, 2014;Lacerda et al, 2010). It has beneficial effect, as can be observed by the results obtained to overcome dormancy in seed lots of Brachiaria brizantha cv.…”

Section: Introductionmentioning

confidence: 82%

Physiological changes in hybrid Brachiaria cv. Mulato II after accelerated aging to overcome dormancy

et al. 2017

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-To evaluate the effect of accelerated aging to overcome dormancy of hybrid Brachiaria cv. Mulato II (U. brizantha x U. decumbens x U. ruziziensis), seeds were collected from two lots with and without scarification, submitted to 42 °C and high humidity (98%) for different periods (0, 24, 48, 72 and 96 h) and then dried at 30 °C to the humidity of 9.1%. The physiological changes were evaluated by tetrazolium, germination, electrical conductivity, respiratory activity and enzymatic evaluation. The exposure of the hybrid Brachiaria cv. Mulato II to accelerated aging at 42 °C and 98% relative air humidity for up to 96 hours does not alter its viability by the tetrazolium test. Accelerated aging at 42 °C and 98% of humidity for up to 48 hours favors the germination of the scarified seeds of hybrid Brachiaria cv. Mulato II, with increased expression of α-amylase enzyme and reduction of electrical conductivity values. Loss of vigor occurs in scarified seeds of hybrid Brachiaria cv. Mulato II when exposed to accelerated aging at 42 °C and 98% of humidity from 96 hours with consequent changes in enzymatic systems and increased of the respiratory rate. o C e 98% de umidade relativa do ar a partir de 96 h, com consequentes alterações nos sistemas enzimáticos e aumento da taxa respiratória.Termos para indexação: sementes de forrageira, germinação, condutividade elétrica, respiração, isoenzimas.

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Superação da dormência de sementes de Brachiaria brizantha cv. “Marandu”

Cited by 17 publications

References 5 publications

Potassium nitrate on overcoming dormancy in Brachiaria humidicola ‘BRS Tupi’ seeds

Potassium nitrate on overcoming dormancy in Brachiaria humidicola ‘BRS Tupi’ seeds

AVALIAÇÃO DA DORMÊNCIA DE Urochloa humidicola CV. LLANERO SOB DIFERENTES DOSES DE ÁCIDO GIBERÉLICO E PACLOBUTRAZOL

Physiological changes in hybrid Brachiaria cv. Mulato II after accelerated aging to overcome dormancy

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