Marcador isoenzimático de dormência em sementes de arroz

Vieira, Antônio Rodrigues; Oliveira, João Almir; Guimarães, Renato Mendes; Pinho, Édila Vilela de Resende Von; Pereira, Carlos Eduardo; Clemente, Aline da Consolação Sampaio

doi:10.1590/s0101-31222008000100011

Cited by 14 publications

(16 citation statements)

References 7 publications

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“…For the seeds of this cultivar stored under natural conditions, breaking dormancy has occurred early, at 3.5 months of storage ( Figure 2); probably the alternating temperatures and the storage average maximum temperatures near 25 °C (Figure 1) have accelerated the process of breaking dormancy. Natural environment Vieira et al (2008) also found that rice seeds of irrigated cultivar Rio Grande stored in conventional environment in Lavras, MG, with a temperature between 15 and 28 °C and relative humidity ranging between 60 and 72%, have broken dormancy more rapidly during storage than stored seeds in a cold and dry room. These results show that seed dormancy decreases over the storage period, especially with increasing temperature.…”

Section: Resultsmentioning

confidence: 95%

“…A small percentage of dormancy observed in the seeds of cultivars (Table 1), 17% in the seeds of BRS Ourominas and 5% in BRSMG Caravera, may be the reason for the high activity of α-amylase in the beginning of the storage period. Livesley and Bray (1991);Vieira et al (2008) have reported that in seeds with high dormancy, the activity of α-amylase has been little. Shaw and Ou-Lee, cited by Das and Sen-Mandi (1992), have reported that the α-amylase activity is essential for the germination of the rice seeds.…”

Section: Resultsmentioning

confidence: 99%

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Dormancy and enzymatic activity of rice cultivars seeds stored in different environments

Marques

Araújo

et al. 2014

J. Seed Sci.

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-The objective of this study was to assess the dormancy and the enzymatic activity of seeds of rice cultivars during storage in different environments. After harvesting, the seeds of two rice cultivars (BRS Ourominas and BRSMG Caravera) were dried in the sun, to reach a moisture content around 13%. Then, they were packed in paper and stored in four environments: 5 ± 2 °C / 70 ± 5% RH, 12 ± 2 °C / 70 ± 5% RH, 18 ± 2 °C / 65 ± 5% RH and in a natural condition. Germination and enzymatic activity were assessed at the beginning and at 3, 6, 9 and 12 months of storage. The experiment was conducted in split subplots in a completely randomized design with three replications. The dormancy of seeds stored in the natural environment was exceeded in a shorter time than the dormancy of seeds stored in cold. Catalase and ascorbate peroxidase activity increased during the storage period, the most obviously in storage in natural environment to cultivate BRSMG Caravera. The activity of the enzyme α-amylase decreased during the storage period.Index terms: enzymes, germination, Oryza sativa L. Dormência e atividade enzimática de sementes de cultivares de arroz armazenadas em diferentes ambientes RESUMO -O objetivo deste trabalho foi avaliar a dormência e a atividade enzimática de sementes de cultivares de arroz durante o armazenamento em diferentes ambientes. Após a colheita, as sementes das cultivares de arroz BRS Ourominas (várzea) e BRSMG Caravera (terras altas) foram secadas ao sol, até atingirem teor de água em torno de 13%. Em seguida, foram acondicionadas em embalagem de papel e armazenadas em quatro ambientes: 5 ± 2 °C/70 ± 5% UR, 12 ± 2 °C/70 ± 5% UR, 18 ± 2 °C/65 ± 5% UR e em condição natural. A germinação e a atividade enzimática foram avaliadas no início e aos 3, 6, 9 e 12 meses de armazenamento. O experimento foi realizado no esquema de parcelas subdivididas no delineamento inteiramente casualizado com três repetições. A dormência das sementes armazenadas em ambiente natural foi superada em menor tempo do que as sementes armazenadas em câmara fria. Houve aumento da atividade das enzimas catalase e ascorbato peroxidase, com maior evidência no armazenamento em ambiente natural, para a cultivar BRSMG Caravera. A atividade da enzima α-amilase diminuiu durante o período de armazenamento.Termos para indexação: enzimas, germinação, Oryza sativa L.

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Section: Resultsmentioning

confidence: 95%

Section: Resultsmentioning

confidence: 99%

Dormancy and enzymatic activity of rice cultivars seeds stored in different environments

Marques

Araújo

et al. 2014

J. Seed Sci.

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“…Em Oryza sativa, a dormência está relacionada a fatores intrínsecos, sendo variável entre as cultivares, os lotes de sementes, ano de produção, entre outros, e sua superação pode ser influenciada pelas condições de armazenamento, especialmente em temperaturas mais elevadas, como apresentado por Vieira et al (2008), proporcionando o aumento significativo no percentual germinativo. Ainda, Menezes et al (2009) ressaltam que a dormência em sementes de arroz varia entre cultivares, lotes, sementes, de ano para ano, situações que dificultam o estabelecimento de um método único e eficiente para a sua superação.…”

Section: Resultsunclassified

Relações entre as variáveis das análises de sementes de espécies agrícolas

Brunes

Lúcio

2017

Agraria

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RESUMOOs objetivos do trabalho foram avaliar as relações diretas e indiretas entre a germinação de plântulas normais e as demais variáveis das análises de sementes, identificar a contribuição relativa das variáveis das sementes, e promover o agrupamento das análises dentro de cada espécie agrícola. Foram usados resultados de 1.332 análises de sementes analisadas entre 2007 e 2014 obtidos dos arquivos do laboratório de sementes da Universidade Federal de Santa Maria. A análise de trilha confirmou a verdadeira associação e influência de sementes mortas na redução da germinação de Oryza sativa, Avena strigosa, Lolium multiflorum e Triticum aestivum. Houve inexistência de relação casual e de efeitos diretos do percentual de material inerte, outras sementes e sementes duras/dormente sobre a germinação. A germinação apresenta maior representabilidade na explicação da variabilidade existente em Lolium multiflorum e Triticum aestivum. A análise de agrupamento discriminou as análises de sementes quanto à sua qualidade de lotes de sementes. Os grupos formados diferiram significativamente pela germinação, percentual de sementes mortas e de outras sementes em Oryza sativa, Glycine max e Lolium multiflorum, respectivamente.Palavras-chave: análise multivariada; forrageiras; germinação; leguminosas; pureza How the variables in crop species seed analysis are interrelated ABSTRACTThe aim of this study was to evaluate the direct and indirect relationships between normal seedling germination and other crop seed analysis variables, to identify the relative contributions of seed variables and combine analyses for each crop species. The study was based on the results of 1.332 seed analyses carried out between 2007 and 2014 obtained from the seed laboratory archives of the Universidade Federal de Santa Maria. Path analysis confirmed the true association and influence of dead seeds on the reduction of the germination of Oryza sativa, Avena strigosa, Lolium multiflorum e Triticum aestivum. There was no casual relationship and direct effects of percentage of inert material, other seeds and dormant seed on germination. Germination is more representative in explaining the variability in Lolium multiflorum and Triticum aestivum. The cluster analysis of seed analysis discriminated against regarding your quality of seed lots. The groups differed significantly by germination, percentage of dead seeds and other seeds in Oryza sativa, Glycine max and Lolium multiflorum, respectively.

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“…6-benzylaminopurine acted on the control of the hydrolysis of the rhizomes reserves being necessary for induction of α-amylase to hydrolyze starch. According to Vieira et al (2008) the development of amylase activity is an important event and can be detected during early germination, and its main function available substrates used for seedling until it becomes photosynthetically selfsufficient. These nutritional reserves, digested by the enzyme accumulated in the form of sugars, amino acids and nucleic acids are then transported to the lateral buds in the rhizomes.…”

Section: Discussionmentioning

confidence: 99%

Growth regulators and carving on breakage of apical dominance in tannia [Xanthosoma sagittifolium (L.) Schott] rhizomes

Souza¹,

Ferreira²,

Finger³

2016

Aust J Crop Sci

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Specific clones of tannia are commonly used as cooking leaves in some Brazilian states. The crop is propagated exclusively as exually by planting the rhizomes usually after a few years of production. Because of that, there is the need to establish strategies to propagate healthy plantlets with higher sprouting rate for leaf production. This work had the goals to evaluate the influence of growth regulators and carving of the rhizomes sprouting and growth of tannia. Cured rhizomes from the clone 'Caipira' were stored for three months at 5ºC and 89% relative humidity. Afterward, the top of half of the rhizomes were carved in a V shape at the top (carving), to stimulate lateral sprouting. The rhizomes were submerged for 30 minutes in solutions containing 6-benzylaminopurine (BAP) and/or 2-chloroethylphosphonic acid (ethephon), and the respective control. The production of new leaves and expansion of leaf area were stimulated by treating the rhizomes with 500 mg L

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Marcador isoenzimático de dormência em sementes de arroz

Cited by 14 publications

References 7 publications

Dormancy and enzymatic activity of rice cultivars seeds stored in different environments

Dormancy and enzymatic activity of rice cultivars seeds stored in different environments

Relações entre as variáveis das análises de sementes de espécies agrícolas

Growth regulators and carving on breakage of apical dominance in tannia [Xanthosoma sagittifolium (L.) Schott] rhizomes

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