Sulphuric acid scarification effects on Brachiaria brizantha, B. humidicola and Panicum maximum seed dormancy release

Usberti, Roberto; Martins, Leila

doi:10.1590/s0101-31222007000200020

Cited by 30 publications

(32 citation statements)

References 3 publications

(4 reference statements)

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“…With the removal of the superficial layers a greater respiratory activity was detected, that is, a greater gas exchange occurred, intensifying the deterioration of the seeds. This reinforces what was observed by Previero et al (1998), Usberti and Martins (2007) and Santos et al (2011), for Brachiaria seeds, which state that one of the causes of dormancy is gas impermeability, provided by the envelope layers of the seeds. Since the enveloping layers do not allow wide gas exchange, less is the action of free radicals in the embryonic tissues, justifying the low expression of the antioxidant enzymes.…”

Section: Resultssupporting

confidence: 91%

“…For seeds of Brachiaria, chemical scarification with sulfuric acid has been recommended , but it presents operational risks to workers, pollutes the environment and, in addition, can promote qualitative damage to seeds (Usberti and Martins, 2007). Thus, mechanical scarification presents advantages by removing the external structures of the seeds, facilitating gas exchange by the seeds (Zuffo et al, 2014).…”

Section: Introductionmentioning

confidence: 99%

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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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Section: Resultssupporting

confidence: 91%

Section: Introductionmentioning

confidence: 99%

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

et al. 2017

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“…For chemical treatment, seeds can be soaked in concentrated grade H 2 SO 4 and for mechanical treatment, for example, dried seeds are taken and placed in metal container with gravels. The container is vigorously shaken so that the gravels scratch the seed epicarp (Usberti and Martines, 2007). In nature, scarification often occurs by fall seeding.…”

Section: Introductionmentioning

confidence: 99%

Effect of Different Treatments on Seed Germination of Honey Locust (Gleditschia triacanthos)

Asl¹,

Sharivivash²,

Rahbari³

2011

MAS

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Honey-locust (Gleditschia triacanthos) seeds, like those of many leguminous species, have hard and impermeable coats. Germination is thought to be enhanced when seeds are scarified or soaked in concentrated sulfuric acid or hot water. This experiment was separated into two parts: Scarification methods and stratification investigation. The result from the first experiment showed that acid scarification treatment for 1 hour was the best method for breaking their dormant period. However in the second experiment it was found that the honey locust seeds like those of many leguminous species do not have dormant embryo, because stratification did not affect seed germination and there was no significant difference between stratification treatment and control. It can be concluded that acid scarification without stratification is optimized in breaking honey-locust seed dormancy.

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“…Circa 20% of that total is exported to South and Central America, Africa and the United States. Pasture seeds are estimated to represent a market of around 600 million dollars per year (VERZIGNASSI, 2013).…”

Section: Introductionmentioning

confidence: 99%

“…Developments experienced in this market have made possible the production of grass seed lots of higher germination in terms of speed and uniformity of germination (VERZIGNASSI, 2013).…”

Section: Introductionmentioning

confidence: 99%

Period of time taken by Brachiaria humidicola (Rendle) Scheweick seed to complete germination

et al. 2016

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The period of 21 days suggested by the Brazilian Rules for Seed Testing for the germination test of B. humidicola seeds seems too long for seed producing companies and laboratories since they depend on the results for decisions concerning the storage or the commercialization of the seed lots. So, the objective of this work was to evaluate the possibility of getting germination results of B. humidicola seeds in a shorter period. The procedures consisted in submitting the seeds to a dormancy breaking treatment and to alternating temperatures during the germination test. Seed samples of nineteen S1 and S2 seed lots were submitted to the following treatments: moistening the germination substratum with 1) deionized water (check treatment), 2) a KNO 3 (0.2%) solution, and 3) scarifying the seeds with sulfuric acid for 10 minutes. The germination test was conducted under the conditions of 1) alternating temperatures of 20 and 35 °C and 2) alternating temperatures of 15 and 35 °C both with 8 hours of light. Normal seedlings were evaluated in daily countings. The results showed that the germination test of B. humidicola seeds may be carried out under alternating temperatures of 15 and 35 °C without breaking seed dormancy with a final evaluation of the germination 10 days after the sowing of the seeds. Key words: Dormancy. Forage grass. Pasture. Temperature. ResumoO período de 21 dias recomendado pelas Regras para Análise de Sementes para o teste de germinação de sementes de B. humidicola é considerado excessivo por produtores, comerciantes e laboratórios de análise de sementes, que dependem dos resultados do teste para o controle de qualidade e a comercialização. Desta forma, o objetivo do trabalho foi avaliar a possibilidade de reduzir o período necessário para a condução do teste de germinação de sementes de B. humidicola, estabelecendo o método para superação da dormência e a temperatura ideal. Dezenove lotes de sementes comerciais S1 e S2 recém-recebidos na unidade de beneficiamento foram avaliados quanto à germinação, em quatro subamostras de 100 sementes por tratamento, constituído de: substrato umedecido com água deionizada (testemunha), substrato umedecido com KNO 3 (0,2%) e escarificação com ácido sulfúrico por 10 minutos. Para o teste de germinação, foram avaliadas duas condições de temperaturas alternadas (20-

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Sulphuric acid scarification effects on Brachiaria brizantha, B. humidicola and Panicum maximum seed dormancy release

Abstract: -Most tropical forage grass species have dormant seeds, which reduce percentages in germination tests. The objective of this study was to evaluate H 2 SO 4 scarification effects on seed dormancy releasing, through germination time (T 50

Cited by 30 publications

References 3 publications

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

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

Effect of Different Treatments on Seed Germination of Honey Locust (Gleditschia triacanthos)

Period of time taken by Brachiaria humidicola (Rendle) Scheweick seed to complete germination

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