Teor de proteína e qualidade fisiológica de sementes de arroz

Bortolotto, Rafael Pivotto; Menezes, Nilson Lemos de; Garcia, Danton Camacho; Mattioni, Nilson Matheus

doi:10.1590/s0006-87052008000200028

Cited by 12 publications

(9 citation statements)

References 11 publications

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“…The results for dry mass allowed for the separation of lots according to vigor levels, where lots 1 and 2 were the highest quality and lot 5 was the lowest, confirming the results found for the tests of field emergence, electrical conductivity and length of shoot. Bortolotto et al (2008) also observed that lots of two cultivars of rice seeds were able to be stratified using the dry mass test. Conversely, Braz and Rossetto (2009) observed that the dry mass test was not able to differentiate between five lots of sunflower seeds, however, lots were able to be differentiated in other tests, such as the field emergence test.…”

Section: Resultsmentioning

confidence: 91%

Respiratory activity in wheat seeds as related to physiological quality

Dode¹,

Almeida²,

Deuner³

et al. 2016

Biosci. J.

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Seeds are a very important input for crops, and the use of low quality seeds and/or inadequate management affects the germination and hampers seedling emergence, which reduces the plant stand. There is a critical need for the development of rapid methods, which are both reliable and easy to perform, for evaluating the physiological potential of seeds. This would streamline the decision-making process regarding the management of lots and allow for the identification of seed lots of inadequate quality in the seed processing unit, which could then be discarded, and would consequently result in reduced costs associated with unnecessary processing. However, it is important that these methods are low cost and quick to perform. The aim of this study was to evaluate the correlation of respiratory activity of wheat seed, through Pettenkofer test, with tests that evaluate seeds physiological quality. We selected a seed lot of high physiological quality, then subjected the seeds to adverse temperature and relative humidity conditions to obtain different vigor levels. The adverse conditions used were 42ºC and 100% relative humidity, for periods of 6, 36, 66 and 96 hours. This process obtained seeds of five vigor levels which were subjected to the following tests: germination, field emergence, electrical conductivity, shoot and root length, total dry mass and respiratory activity. The results showed a negative correlation between respiratory activity and germination, emergence, shoot and root length and dry weight, whereas germination and emergence were strongly correlated with respiratory activity, r = -0.86 and r = -0.81, respectively. There was a significant positive correlation between conductivity and respiratory activity. Therefore, the respiratory activity test using the Pettenkofer method was correlated with other vigor tests, and allowed the classification of wheat seeds into lots of different levels of quality.

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Section: Resultsmentioning

confidence: 91%

Respiratory activity in wheat seeds as related to physiological quality

Dode¹,

Almeida²,

Deuner³

et al. 2016

Biosci. J.

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“…According to Carvalho and Nakagawa (2012), because the first biochemical event known to occur upon exposure to unfavorable environmental conditions is a decrease in protein synthesis, seeds with higher physiological quality have higher protein content. Studying the relationship between protein content and physiological quality of rice seeds, Bortolotto et al (2008) observed that measurements of protein content can identify differences in quality between seed lots with different levels of physiological potential and can be correlated with seed emergence in the field. The authors further reported protein assessment as a promising finding for association with conventional tests.…”

Section: Resultsmentioning

confidence: 99%

Space Distribution of Soybean Seed Storage Potential

2019

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The objective of this study was to identify the spatial distribution of the physiological quality of soybean seeds during storage from a production field of 39 hectares using geostatistical techniques in the 2012/2013 harvest. Seeds were sampled at geo-referenced points for the determination of physiological quality and spatial dependence analysis. The results were submitted to analysis of descriptive statistics, Pearson's linear correlation and geostatistics. The grid of one point per hectare and a georeferenced sampling mesh with spacing of 100 meters between points was efficient in the evaluation of the spatial variability. It was verified the existence of a negative correlation between the variable protein content and bed bug attack and a significant correlation between the intensity of bed bug damage and the protein content with the variables related to seed quality. Physiological quality is not uniform, particularly in relation to vigor, providing better diagnosis through interpolation maps. Precision agriculture, coupled with the monitoring of seed quality during storage, indicated spatial variability of quality from harvest to the end of storage. Areas with high rates of bedbug and unit damage presented low quality physiology and reduced protein levels. The geostatistics allows to determine the spatial distribution of the physiological quality of soybean seeds in the area of seed production, facilitating the decision making, regarding the areas to be harvested. DISTRIBUIÇÃO ESPACIAL DO POTENCIAL DE ARMAZENAMENTO DE SEMENTES DE SOJARESUMO -Objetivou-se identificar a distribuição espacial da qualidade fisiológica de sementes de soja durante o armazenamento, provenientes de campo de produção de 39 hectares por meio de técnicas de geoestatística na safra 2012/2013. Realizou-se amostragem de sementes em pontos georreferenciados, para a determinação da qualidade fisiológica e análise da dependência espacial. Os resultados foram submetidos às análises de estatística descritiva, correlação linear de Pearson e geoestatística. O grid de um ponto por hectare e uma malha de amostragem georreferenciada com espaçamento de 100 metros entre pontos foi eficiente na avaliação da variabilidade espacial. Constatou-se a existência de correlação negativa entre a variável teor de proteína e ataque de percevejos e correlação significativa entre a intensidade de dano por percevejo e o teor de proteína com as variáveis relacionadas a qualidade de sementes. A qualidade fisiológica não é uniforme, particularmente em relação ao vigor, proporcionando melhor diagnóstico por meio de mapas de interpolação. A agricultura de precisão, associada ao monitoramento da qualidade de sementes durante o armazenamento, indicou variabilidade espacial da qualidade desde a colheita até o fim do armazenamento. Áreas com altos índices de danos por percevejo e unidade apresentaram baixa qualidade fisiologia e reduzidos teores de proteína. A geoestatística possibilita determinar a distribuição espacial da qualidade fisiológica de sementes de soja em área ...

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“…Diferenças no vigor, associadas às características das sementes, são, geralmente, atribuídas à composição química, principalmente com relação à quantidade de reservas, ou à eficiência no metabolismo (Bortolotto et al 2008).…”

Section: Key-wordsunclassified

“…Lotes com maior qualidade fisiológica apresentam maior teor de proteína bruta, visto que o primeiro evento bioquímico verificado, quando as sementes são expostas a condições desfavoráveis de ambiente, é o dano à síntese de proteínas (Carvalho & Nakagawa 2000, Bortolotto et al 2008.…”

Section: Key-wordsunclassified

Temperaturas de secagem na integridade física, qualidade fisiológica e composição química de sementes de arroz

Menezes

Pasqualli

Barbieri

et al. 2012

Pesqui. Agropecu. Trop.

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INTRODUÇÃOO Brasil é o principal produtor de arroz, no continente americano, destacando-se entre os dez maiores produtores mundiais, com produção superior a 12 milhões de toneladas, o que representa, aproximadamente, 1,8% do total mundial e cerca de 50% da produção das Américas (Embrapa 2009 A secagem de sementes é uma operação indispensável no processo de produção, porém, a temperatura utilizada pode afetar a qualidade das sementes produzidas. Este trabalho objetivou avaliar o efeito de diferentes temperaturas de secagem na integridade física, qualidade fisiológica e composição química de sementes de arroz irrigado. Formaram-se quatro lotes de cada cultivar, os quais foram secos pelo método estacionário, utilizando-se as seguintes temperaturas: 32ºC, 38ºC, 44ºC e 50ºC. Após os tratamentos de secagem, avaliou-se a integridade física das sementes, por meio do teor de umidade e da percentagem de fissuras. A qualidade fisiológica foi determinada com o auxílio de teste de germinação, primeira contagem, condutividade elétrica, envelhecimento acelerado, teste de frio, comprimento total e fitomassa seca de plântula. A composição química das sementes foi avaliada por meio das frações massa seca, proteína e fibra bruta e extrato etéreo das sementes. As temperaturas de secagem afetaram a qualidade das sementes, e o aumento da temperatura, na secagem (32-50ºC), aumentou, também, a percentagem de fissuras nas sementes de arroz irrigado. As temperaturas de 32ºC e 38ºC, na secagem, permitiram a expressão da qualidade das sementes, enquanto a temperatura de 50ºC reduziu o seu potencial fisiológico. PALAVRAS-CHAVE:Oryza sativa L.; composição química de sementes; vigor de sementes. Drying temperatures on physical integrity, physiological quality and chemical composition of rice seedsThe drying of seeds is essential for its production process, however, the temperature used can affect seeds quality. This study aimed at evaluating the effect of different temperatures on physical integrity, physiological quality and chemical composition of rice seeds. Four lots were arranged for each cultivar, being dried with the aid of the stationary method, by using the following temperatures: 32ºC, 38ºC, 44ºC and 50ºC. After each drying treatment, the physical integrity of seeds was analyzed, by evaluating its moisture content and fissures percentage. Physiological quality was evaluated with the aid of the germination test, first counting, electrical conductivity, accelerated aging, cold test, total length and dry mass of seedlings. The chemical composition of seeds was determined by evaluating their dry mass, crude protein and fiber and ethereal extract. The drying temperatures affected seeds quality, and when they increased (32-50ºC), the percentage of fissures in irrigated rice seeds also increased. Drying temperatures of 32ºC and 38ºC allowed the expression of seed quality, while the temperature of 50ºC reduced its physiological potential. KEY-WORDS:Oryza sativa L.; seeds chemical composition; seeds vigor.

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Teor de proteína e qualidade fisiológica de sementes de arroz

Cited by 12 publications

References 11 publications

Respiratory activity in wheat seeds as related to physiological quality

Respiratory activity in wheat seeds as related to physiological quality

Space Distribution of Soybean Seed Storage Potential

Temperaturas de secagem na integridade física, qualidade fisiológica e composição química de sementes de arroz

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