Quimio e termoterapia em sementes e aplicação de fungicidas em Brachiaria brizantha como estratégias no manejo do carvão

Marchi, Carlos Eduardo; Fernandes, C. D.; Anache, Fábio Coutinho; Jerba, Vanessa de Fátima; Fabris, Larissa Rodrigues

doi:10.1590/s0100-54052008000400004

Cited by 6 publications

(5 citation statements)

References 3 publications

(1 reference statement)

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“…Differences in germination values between scarified and non-scarified Brachiaria seeds were also observed by Marchi et al (2008) and Santos et al (2011) for U. brizantha cv. Piatã and U. dictyoneura (Almeida and Silva, 2004).…”

Section: Resultssupporting

confidence: 66%

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: 66%

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

et al. 2017

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“…The presence of contaminating microorganisms in storage or after the point of physiological maturity also presents a major threat to seed health (Marchi et al, 2007;Marchi et al, 2008;Marchi et al, 2010), therefore it is important to study pathogen transmission via seed to seedling.…”

Section: Introductionmentioning

confidence: 99%

Physiological and sanitary quality, and transmission of fungi associated with Brachiaria brizantha (Hochst. ex. A. Rich.) Stapf seeds submitted to thermal and chemical treatments

2014

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-The Brazilian pastures establishment success depends on the use of seeds with high physiological and sanitary quality. The aim of this study was to evaluate the effect of thermal and chemical treatments on quality of Brachiaria brizantha, cv. BRS Piatã and pathogen transmission via seed. The treatments included the use of fungicides, detergent, sodium hypochlorite, sulfuric acid and alcohol, as well as thermal treatments. In addition to seeds without treatment, nine treatments were tested.The tests used to assess the physiological quality of the seeds were first and final count of germination test and root protrusion; germination and root protrusion speed index. A transmitting test and filter paper method had been performed for sanitary quality. Fungal lower incidence was observed in seeds treated with alcohol, however, this treatment reduced the physiological quality of the seeds and higher frequency of fungi transmission from seeds to seedlings was observed for Bipolaris sp., Fusarium sp. and Phoma sp. Treatment with sulfuric acid provided a better seed germination performance and reduced the incidence of fungi.Index terms: germination, vigor, seed-seedling, incidence, forage.Qualidade fisiológica, sanitária e transmissão de fungos associados às sementes de Brachiaria brizantha (Hochst. ex. A. Rich.) Stapf submetidas a tratamentos térmicos e químicos RESUMO -O sucesso no estabelecimento das pastagens brasileiras depende da utilização de sementes com boa qualidade fisiológica e sanitária. Objetivou-se com o trabalho avaliar o efeito de tratamentos térmicos e químicos sobre a qualidade fisiológica e sanitária de sementes de Brachiaria brizantha, cultivar BRS Piatã e a transmissão de patógenos via semente. Os tratamentos incluíram o uso de fungicidas, detergente, hipoclorito de sódio, álcool e ácido sulfúrico, além de tratamentos térmicos. Os testes utilizados para a avaliação da qualidade fisiológica das sementes foram primeira contagem e contagem final do teste de germinação e de protrusão radicular; índice de velocidade de germinação e de protrusão radicular. Para a qualidade sanitária foi realizado o método de papel de filtro e o teste de transmissão. Menor incidência fúngica foi observada nas sementes tratadas com álcool, no entanto, esse tratamento reduziu a qualidade fisiológica das sementes e maior frequência de transmissão de fungos das sementes para as plântulas foi observada para Bipolaris sp., Fusarium sp. e Phoma sp. O tratamento com ácido sulfúrico proporcionou melhor desempenho germinativo das sementes e reduziu a incidência de fungos.Termos para indexação: germinação, vigor, semente-plântula, incidência, forrageira.

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“…The effectiveness of reducing fungal contamination considering these treatments differs from the results of Marchi et al (2008) using treatments of 27, 40, 50 and 60 °C for 5 and 10 min in the thermotherapy of Brachiaria brizantha (Hochst.) Stapf seeds for control of Ustilago operta Syd., P. Syd.…”

Section: +mentioning

confidence: 87%

Thermotherapy as a Microbial Contaminant-Reducing Agent in Micropropagation of Bamboo

et al. 2019

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The aim of the research was to evaluate the effectiveness of thermotherapy by humid heat of nodal segments to reduce the incidence of microbial contaminants in the introduction phase of the in vitro propagation of Bambusa vulgaris. Two independent experiments were carried out in a completely randomized design using a 4 × 2 factorial arrangement, four levels of temperature (25, 30, 40 and 50 °C) versus two treatment time intervals (5 or 10 min). Each treatment was composed of nine replications, corresponding to one single-nodal segment obtained from primary or secondary branches, in sucrose-free Murashige and Skoog medium with half the concentration of salts, supplemented with 6.5 g L-1 agar, 50 mg L-1 citric acid, 50 mg L-1 ascorbic acid, 200 mg L-1 chloramphenicol and 2 mg L-1 N6-benzylaminopurine. Isolation of prevalent mold fungi per repetition was conducted, and identification at genus level obtained from microcultures. The treatments corresponding to 50 °C for 5 or 10 min reduced significantly the fungal contamination that occurred at 11% and 0%, respectively, in nodal segments from primary branches, and 0% and 11%, respectively, in those from secondary ones. Fungi of genera Alternaria, Bipolaris and Curvularia were isolated from both types of segment, and Cladosporium from secondary branches only. The lowest percentages of mycelial growth detected in nodal segments submitted to both binomials demonstrated the effectiveness of the technique to reduce fungal contamination despite negative interference on sprouting.

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Quimio e termoterapia em sementes e aplicação de fungicidas em Brachiaria brizantha como estratégias no manejo do carvão

Cited by 6 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

Physiological and sanitary quality, and transmission of fungi associated with Brachiaria brizantha (Hochst. ex. A. Rich.) Stapf seeds submitted to thermal and chemical treatments

Thermotherapy as a Microbial Contaminant-Reducing Agent in Micropropagation of Bamboo

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