Duração do teste de germinação de Brachiaria brizantha cv. marandu (Hochst. ex A. Rich.) Stapf

Gaspar-Oliveira, Carolina Maria; Martins, Cibele Chalita; Nakagawa, João; Cavariani, Cláudio

doi:10.1590/s0101-31222008000300005

Cited by 17 publications

(9 citation statements)

References 10 publications

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“…Thus, we can reduce the evaluation time prescribed by Brasil (2009), in which the first count is made after four days and the final count after 14 days. The possibility of reducing the germination test duration was also observed for Brachiaria brizantha cultivar Marandu (Gaspar-Oliveira et al, 2008) and for Tanzania grass (Tomaz et al, 2010), similarly to that observed in the present study. Figure 3 -Distribution of the relative frequency of Carthamus tinctorius seed germination from lot 5 on substrates between sand, on paper, between paper, and paper roll.…”

Section: Characteristicssupporting

confidence: 90%

“…The standards and procedures of the Rules for Seed Analysis (Brasil, 2009) are periodically reviewed by a committee of researchers and practitioners, but modifications can only be made based on research results (Tomaz et al, 2016). Research on this matter was conducted with forage turnip (Nery et al, 2009), brachiaria grass (Gaspar-Oliveira et al, 2008), and humidicola grass (Tomaz et al, 2016).…”

Section: Introductionmentioning

confidence: 99%

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Substrates and duration for conducting the safflower seed germination test

Gama¹,

Machado²,

Silva³

et al. 2019

Científica

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Safflower (Carthamus tinctorius) is an annual, rustic plant that has multiple uses. Seed laboratory analysis showed discrepancies in germination depending on the substrate used in a given lot. Therefore, studies are needed to determine the best substrate and the time required to perform the first and final count of the safflower seed germination test. Five lots were used, which were characterized by moisture degree and thousand seed weight. These lots were evaluated on four substrates (between paper, on paper, paper roll, and between sand). The five lots and four substrates were distributed in a 5x4 factorial scheme in a randomized block design with four replicates of 25 seeds. The influence of the factors was evaluated by daily germination count until stabilization, determining the percentage of normal and abnormal seedlings and dead seeds; germination speed index; initial, mean, and final germination time; synchrony and relative frequency; and the date of the first and final germination count. After obtaining the data, analysis of variance was performed. When there was a significant effect, the means were compared using the Tukey test at 5% and 1% probability. Therefore, it is recommended that the safflower seed germination test be conducted on the substrate between paper, with the first and final count being performed at 3 rd and 8 th days, respectively.

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Section: Characteristicssupporting

confidence: 90%

Section: Introductionmentioning

confidence: 99%

Substrates and duration for conducting the safflower seed germination test

Gama¹,

Machado²,

Silva³

et al. 2019

Científica

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“…De modo geral, o uso da escarificação química proporcionou uma rápida germinação das sementes pois, aos sete dias, 88% das sementes escarificadas (viáveis) estavam germinados; em contrapartida, somente 40% das sementes sem escarificação (viáveis) haviam germinado; ainda se salienta que quase a totalidade das sementes germinou por volta dos 14 dias. Gaspar- Oliveira et al (2008) verificaram que os tratamentos de escarificação com H 2 SO 4 e a temperatura de 20-35 °C resultaram na maior germinação em menor tempo, possibilitando o encerramento do teste de sementes de B. brizantha cv. Marandu aos 11 dias após a semeadura.…”

Section: Resultsunclassified

Tratamentos pré-germinativos em sementes de Brachiaria

Binotti

Junior

Cardoso

et al. 2014

Agraria

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RESUMOAvaliaram-se, neste trabalho, o efeito da escarificação química com ácido sulfúrico (H 2 SO 4 ) e períodos de pré-embebição (PPe) em solução de nitrato de potássio (KNO 3 ), na superação de dormência de sementes e no desempenho inicial de plântulas de Brachiaria brizantha cv. MG-5. O estudo foi desenvolvido no Laboratório de Análise de Sementes da UUC/UEMS localizado no município de Cassilândia -MS, em 2010, em delineamento experimental inteiramente ao acaso. As sementes foram submetidas aos tratamentos pré-germinativos de escarificação química com H 2 SO 4 e imersão direta em solução de KNO 3 (0,2%) por 0, 2, 4, 6 e 8 h. As avaliações realizadas foram: determinação do grau de umidade, testes de germinação e vigor (índice de velocidade de germinação, comprimento da parte aérea, fitomassa fresca e seca de plântulas e teste de tetrazólio em sementes remanescentes do teste de germinação). A escarificação química é uma técnica eficiente para superar dormência em sementes de Brachiaria brizantha cv. MG-5, porém pode interferir negativamente no desempenho inicial de plântulas. Já o tratamento pré-germinativo das sementes em solução de nitrato de potássio (0,2%) por 3,4 h, tem efeitos benéficos na qualidade fisiológica das sementes. Palavras-chave:Brachiaria brizantha, imersão em nitrato de potássio, superação de dormência, vigor de sementes Brachiaria seeds pre-germination treatments ABSTRACTWe evaluated the effect of chemical scarification with sulfuric acid (H 2 SO 4 ) and periods of pre-soaking (PPe) in a solution of potassium nitrate (KNO 3 ), to overcome dormancy of seed and initial seedlings performance of Brachiaria brizantha cv. MG-5. The study was conducted at the Laboratory of Seeds Analysis UUC / UEMS located in the municipality of Cassilândia -MS in 2010. The experimental design was completely randomized (DIC). Seeds were submitted to pre-germination treatments of chemical scarification with H 2 SO 4 and immersion in a solution of KNO 3 for 0, 2, 4, 6 and 8 h. The following evaluations were performed: determination of moisture content, germination tests and vigor tests (index of germination rate, shoot length, fresh and dry weight of seedlings and tetrazolium remaining seeds in the germination test). The results showed that the chemical scarification is an effective technique to overcome seed dormancy in Brachiaria brizantha MG-5, but can negatively impact the performance of initial seedlings. Already pre-germination treatment of seeds in a solution of potassium nitrate (0.2%) for 3.4 h, has beneficial effects on seed quality.

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“…Although B. brizantha seeds are sometimes dormant (BRASIL, 2009) this has not been observed nowadays in commercial lots of seeds of this species, this being probably due to the fact that the harvested seeds are those which have naturally fallen from the plant and are swept to 575 Evaluation the physiological… SILVA, G. Z. et al be collected, or, in other words, only the physiologically mature seeds are harvested, that is, the seeds which have had the time to complete the maturation process (MASCHIETTO et al, 2003;GASPAR-OLIVEIRA et al, 2008;TOMAZ et al, 2015). Seedling emergence in the field data were used as a reference for the selection of the vigor tests.…”

Section: Resultsmentioning

confidence: 99%

Evaluation the physiological quality of Brachiaria brizantha cv. BRS ‘Piatã’ seeds

Silva¹,

Martins²,

Cruz³

et al. 2017

Biosci. J.

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ABSTRACT:In a quality control program, seed vigor evaluation is of fundamental importance for the success of the program. The objective of this project was to evaluate the efficiency of several vigor tests to evaluate the physiological quality of Brachiaria brizantha cv. 'BRS Piatã' seed lots and to preview seedling emergence in the field. Ten grass seed lots of the B. brizantha cv. 'BRS Piatã' were evaluated by the following tests: germination, first count of germination, accelerated aging (43 °C/48 hours), cold test (seeds rolled in paper towel), seed water content before and after accelerated aging, electrical conductivity (50 and 75 mL, 25 °C and readings made 2, 4, 6, 8, and 24 hours after beginning the test), speed of germination index, and seedling emergence in sand substratum in the laboratory (26 ± 3 °C) and daily seedling counts between the 7th and the 21th day after sowing. The treatment replications were distributed in the laboratory according to a completely random design with four replications. Seedling emergence in the field data were analyzed according to a randomized complete block design. Treatment means were compared by the Scott Knott test, at the 5% level of probability. The tests for germination and first germination count, seedling emergence and first emergence count in the sand, and accelerated aging are useful to assess the vigor of seed batches of the piatã grass, and provide similar evidence to the seedling emergence in the field.

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Duração do teste de germinação de Brachiaria brizantha cv. marandu (Hochst. ex A. Rich.) Stapf

Cited by 17 publications

References 10 publications

Substrates and duration for conducting the safflower seed germination test

Substrates and duration for conducting the safflower seed germination test

Tratamentos pré-germinativos em sementes de Brachiaria

Evaluation the physiological quality of Brachiaria brizantha cv. BRS ‘Piatã’ seeds

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