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Falqueto,Antelmo Ralph; Cassol,Daniela; Magalhães Júnior,Ariano Martins de; Oliveira,Antônio Costa de; Bacarin,Marcos Antonio. |
The objective of this work was to evaluate the physiological changes that occur in different leaves during the early and late grain-filling stages of two rice genotypes (Oryza sativa subsp. indica , BRS Pelota cultivar, and O. sativa subsp. japonica , BRS Firmeza cultivar), which present differences in grain yield potential. The plants were cultivated in greenhouse. Pigment content, chlorophyll fluorescence, electron transport and oxygen evolution rate were determined in the grain-filling stage, from the first to the forth leaf (top to bottom). Pigment content, photochemical efficiency of photosystem II and electron transport decreased significantly according to the position of leaves in 'BRS Pelota'. The BRS Firmeza cultivar shows higher pigment content... |
Tipo: Info:eu-repo/semantics/article |
Palavras-chave: Oryza sativa; Oxygen evolution rate; Photochemical quenching; Photosystem II; Photochemicol efficiency; Stay green. |
Ano: 2009 |
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0100-204X2009000700007 |
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Streck,Eduardo Anibele; Magalhães Júnior,Ariano Martins de; Aguiar,Gabriel Almeida; Facchinello,Paulo Henrique Karling; Perin,Lais; Fagundes,Paulo Ricardo Reis; Oliveira,Antônio Costa de. |
Abstract: The objective of this work was to determine the genetic progress of grain quality attributes of flooded irrigated rice (Oryza sativa) cultivars in the state of Rio Grande do Sul, Brazil, between 1972 and 2016. The genetic estimates followed an approach based on the comparative analysis of 25 cultivars released by Embrapa’s breeding program over this period. The experiment was implemented in four producing regions of the state of Rio Grande do Sul: Sul, Campanha, Planície Costeira Interna, and Planície Costeira Externa. The following significant genetic gains were observed: 0.20% per year, for percentage of whole grains after processing; -1.38% per year, for percentage of chalky kernels and white-core grains; -0.77% per year, for total chalky... |
Tipo: Info:eu-repo/semantics/article |
Palavras-chave: Oryza sativa; Breeding; Chalky area; Chalky kernels; Genetic gain; Industrial yield. |
Ano: 2018 |
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0100-204X2018000400453 |
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Streck,Eduardo Anibele; Magalhães Júnior,Ariano Martins de; Fagundes,Paulo Ricardo Reis; Aguiar,Gabriel Almeida; Facchinello,Paulo Henrique Karling; Oliveira,Antônio Costa de. |
Abstract: The objective of this work was to estimate the effects of genotype x environment interaction and the genetic potential of flood-irrigated rice cultivars, released between 1972 and 2017, for the state of Rio Grande do Sul, Brazil. The experiments were carried out in the field, in all agroclimatic regions of flood-irrigated rice crop in the state, between the 2005/2006 and 2015/2016 crop years, totaling 60 environments (trials), with 1,961 experimental units. Twenty-five cultivars of irrigated rice were evaluated for the traits grain yield, plant height, days to flowering, and whole grain quality after milling. The values of adaptability and stability were estimated with the aid of mixed models. The rice cultivars BRS Pampa, BRS Pampeira, and... |
Tipo: Info:eu-repo/semantics/article |
Palavras-chave: Oryza sativa; Genotype x environment interaction; Mixed models; Plant breeding; Zoning of cultivars. |
Ano: 2018 |
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0100-204X2018001001140 |
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Streck,Eduardo Anibele; Magalhães Júnior,Ariano Martins de; Aguiar,Gabriel Almeida; Facchinello,Paulo Henrique Karling; Fagundes,Paulo Ricardo Reis. |
ABSTRACT There is an increasing demand for special types of rice that have black or red pericarp, low amylose (subspecie japonica) or aromatic. However, intense breeding process for obtaining and indicating genetically promising new cultivars and adapted to cultivation environments are demanded. In this sense, for evaluating the special types of irrigated rice genotypes, and determining the adaptability and stability of these using mixed models. First, a preliminary agronomic evaluation of genotypes for special types of irrigated rice was performed, and later, the agronomically promising genotypes were evaluated in multi-site trials, aiming at verifying the interactions with the environment. Statistical analyzes were performed considering mixed models,... |
Tipo: Info:eu-repo/semantics/article |
Palavras-chave: Oryza sativa; Black rice; Red rice; Aromatic rice; Japanese rice. |
Ano: 2019 |
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S1806-66902019000100066 |
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Falqueto,Antelmo Ralph; Cassol,Daniela; Magalhães Júnior,Ariano Martins de; Oliveira,Antônio Costa de; Bacarin,Marcos Antonio. |
Foram estudados o crescimento, a partição de assimilados e a produção de grãos nas cultivares de arroz BRS Pelota (maior produtividade) e BRS Firmeza (menor produtividade). O experimento foi realizado em casa de vegetação, com plantas cultivadas em vaso. Utilizou-se o delineamento experimental inteiramente casualizado, com duas cultivares, nove coletas e quatro repetições por tratamento. Com a cultivar BRS Pelota houve maior acúmulo de matéria seca total (Wt), principalmente no fim do ciclo, bem como maior área foliar (Af). A matéria seca alocada para o colmo + bainha e às panículas também foi maior em BRS Pelota. Porém, a porcentagem de Wt destinada às panículas aos 125 DAE foi semelhante entre as cultivares. Em BRS Firmeza, o aumento em Wt nas raízes... |
Tipo: Info:eu-repo/semantics/article |
Palavras-chave: Matéria seca; Análise de crescimento; Área foliar; BRS Firmeza; BRS Pelota. |
Ano: 2009 |
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0006-87052009000300002 |
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