Períodos de pré-esfriamento na superação da dormência de sementes de azevém-anual (Lolium multiflorum Lam.)

Eichelberger, L.; Maia, M.S.; Camacho, J.C.B.

doi:10.17801/0101-3122/rbs.v23n1p212-218

Cited by 5 publications

(5 citation statements)

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“…As expected, the use of overcoming dormancy resulted in fewer dormant seeds and a greater number of normal seedlings in the genotypes. Similar results were found in annual ryegrass, where the percentage of dormant seeds immediately after harvest without overcoming dormancy was 84% (Eichelberger, Maia & Camacho, 2001). This indicates that overcoming dormancy immediately after harvest (zero days) promotes an increase in normal seedlings.…”

Section: Resultssupporting

confidence: 81%

Characterization of Brazilian black oat genotypes regarding seed dormancy

Kehl,

Carvalho,

Sacon

et al. 2023

Rev. DELOS

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The objective of this work was to characterize 30 black oat genotypes regarding seed dormancy. The experiment was carried out in the 2018 and 2019 seasons in a completely randomized design with three factors, being 30 black oat genotypes, two methods of seed germination analysis (with and without dormancy breaking) and five evaluation periods (0, 30, 60, 90 and 120 days after harvest), distributed in four replicates. In each postharvest period, the variables: normal seedlings, abnormal seedlings, number of dormant seeds and number of dead seeds were analyzed. There was significant interaction between factors during the two years of experimentation. In the 2018 season, the percentage of dormant seeds at period zero ranged from 47 to 3% in the method with overcoming dormancy, 86 to 33% in the method without overcoming dormancy. The genotypes ALPHA 1629 and IAPAR 61- Ibiporã presented highest dormancy. In the 2019 season, the percentage of dormant seeds at period zero ranged from 56 to 3% with overcoming dormancy and 85 to 12% without overcoming dormancy. There is variability of dormancy among genotypes and this is overcome after 60 days of harvest. The IAPAR 61-Ibiporã genotype have highest of dormancy seeds.

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Section: Resultssupporting

confidence: 81%

Characterization of Brazilian black oat genotypes regarding seed dormancy

Kehl,

Carvalho,

Sacon

et al. 2023

Rev. DELOS

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“…Importantly, many methods employed to break seed dormancy immediately after harvest are not completely effective for several forage seeds, resulting in a high percentage of dormant seeds after the germination test, as noted by Eichelberger et al (2001) for ryegrass seeds and confirmed by the results obtained in this study. Thus, after 90 days of storage, although all methods were equally effective to break seed dormancy (except for predrying at 45°C for 96 h, which damaged the physiological quality of seeds in all storage periods), it was observed that the expression of the maximum germination potential of the seeds was not achieved.…”

Section: Resultssupporting

confidence: 81%

“…This behavior has been highlighted by Eichelberger et al (2001) for ryegrass seeds subjected to pre-cooling. The authors state that, because of dormancy, the germination test conducted soon after harvest may underestimate the quality of seeds even after the adoption of pre-cooling as a method to break seed dormancy.…”

Section: Resultsmentioning

confidence: 80%

Methods for breaking seed dormancy of ryegrass during storage periods

Martins¹,

Radke²,

Monteiro³

et al. 2016

Afr. J. Agric. Res.

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The presence of dormant seeds makes it difficult to evaluate physiological quality and requires the use of appropriate methods in order to break seed dormancy. The objective of this study was to evaluate the effectiveness of different methods to break the dormancy of ryegrass seeds stored under environment conditions in different periods. Ryegrass seeds, BRS Ponteio cultivar, produced in two locations were used and evaluated after 60, 90, 120, 150 and 180 days of storage under environment conditions. Seeds were submitted to the following methods to break dormancy: sowing at 20 to 30°C without applying any method to break dormancy (control); pre-cooling (5°C) for 3 days + KNO 3 followed by sowing at 15 to 25°C; pre-drying (45°C) for 96 h followed by sowing at 20-30°C; immersing the seeds in sodium hypochlorite (NaClO) at 0.5% for 24 h, followed by drying at 45°C for 6 h and sowing at 15 to 25°C. At 60 days after harvest, the most effective method was immersion of seeds in a NaClO solution followed by drying at 45°C. From 90 days after harvest, all methods were equally effective to break seed dormancy, except pre-drying (45°C) for 96 h, which negatively affected the physiological quality of seeds. There is a difference in the effectiveness of the methods employed to break the dormancy of ryegrass seeds depending on the type of post-harvest storage.

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“…Almeida et al (1979) mostrou que a resposta ao calor seco oscila muito entre espécies, pois encontraram uma redução no número de sementes duras em calopogônio (Calopogonio mucunoides) e siratro (Macroptilium atropurpureum), não verificando o mesmo em cudzu-tropical (Pueraria phaseoloides). Eichelberger et al (2001) trabalhando com períodos de armazenagem e superação de dormência de azevém-anual (Lolium multiflorum Lam. ), concluíram que as sementes reagem diferentemente à duração do período de pré-esfriamento, resposta que se verificou neste trabalho; assim se poderia esperar que a diferença entre o percentual de sementes duras entre os lotes, além do componente genético se pode atribuir também ao manejo diferenciado dos cultivos, desde o pastejo passando pela colheita, especialmente o método de colheita, e os demais processamentos pós-colheita no que tange as operações que envolvem atrito das sementes.…”

Section: Resultsunclassified

Tratamentos para superação de dormência em sementes de cornichão anual

Meneghello¹,

Melo²

2004

Rev. bras. sementes

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RESUMO -Sementes viáveis de muitas espécies de plantas, freqüentemente não absorvem água e, portanto, não germinam, mesmo que as condições ambientais sejam favoráveis, sendo comumente chamadas impermeáveis ou duras. Portanto, existe a necessidade de se utilizar métodos pré-germinativos que permitam superar a dormência, possibilitando a expressão da máxima germinação do lote. O objetivo do experimento foi identificar os métodos mais eficientes para a superação da dormência tegumentar de sementes de cornichão anual (Lotus subbflorus L.), que sejam rápidos, seguros e de fácil padronização. O experimento foi conduzido no Laboratório Didático de Sementes da Faculdade de Agronomia "Eliseu Maciel", na Universidade Federal de Pelotas. Foram utilizados dois lotes de sementes provenientes da região de Herval do Sul, RS. Os tratamentos realizados foram: teste de germinação (testemunha), pré-esfriamento por 4, 7 e 10 dias (7 ºC), pré-aquecimento por 1, 4, e 7 dias (50 ºC) e escarificação por lixa mecânica por 30, 60 e 90 segundos, a 1750 rpm. Com base nos resultados obtidos, concluiu-se que a escarificação por lixa mecânica por 30, 60 e 90 segundos, a 1750 rpm apresentam as melhores respostas na superação da dormência expressas pela relação plântulas normais com plântulas anormais e sementes mortas.Termos para indexação: Lotus subbflorus L., forrageira, leguminosa, escarificação. PRETREATMENT OF SEEDS TO OVERCOME DORMANCY IN ANNUAL LOTUSABSTRACT -Viable seeds of many plant species do not imbibe water and, therefore, do not germinate, even under favorable environmental conditions and are commonly called impermeable or hard seeds. Thus, there is a need for using pre-germinating methods, which allow surpassing the dormancy, enabling the maximum germination expression of the lot. The study aims to identify the most efficient methods for surpassing the tegument dormancy of annual lotus (Lotus subbflorus L.) seeds, which are also fast, safe and easy to standardize. The experiment was developed at the Seed Didactic Laboratory in the Agronomy College "Eliseu Maciel" at the Federal University of Pelotas. Two lots of seeds from the Herval (RS) area were used. The tests performed were: standard germinating (pre cold for 4, 7 and 10 days (7 ºC), pre heating for 1, 4 or 7 days (50 ºC), escarification for 30, 60 and 90 seconds (1750 rotations by minute), and with no treatment). According to the evaluations made, it was observed that the pre escarification by mechanical sandpaper at 1750 rpm for 30, 60 and 90 seconds was efficient in surpassing the seed dormancy, expressed by better relations among normal and abnormal seedlings and dead seeds

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Períodos de pré-esfriamento na superação da dormência de sementes de azevém-anual (Lolium multiflorum Lam.)

Cited by 5 publications

References 0 publications

Characterization of Brazilian black oat genotypes regarding seed dormancy

Characterization of Brazilian black oat genotypes regarding seed dormancy

Methods for breaking seed dormancy of ryegrass during storage periods

Tratamentos para superação de dormência em sementes de cornichão anual

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