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Genetic progress of grain quality of flooded-irrigated rice cultivars in the state of Rio Grande do Sul, Brazil

Authors :
Eduardo Anibele Streck
Ariano Martins de Magalhães Júnior
Gabriel Almeida Aguiar
Paulo Henrique Karling Facchinello
Lais Perin
Paulo Ricardo Reis Fagundes
Antônio Costa de Oliveira
Source :
Pesquisa Agropecuária Brasileira, Vol 53, Iss 4, Pp 453-463 (2018)
Publication Year :
2018
Publisher :
Embrapa Informação Tecnológica, 2018.

Abstract

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 area; -0.08% per year, for total whiteness; and -0.82% per year, for non-vitreous grain whiteness. Most cultivars released have high amylose content and a low gelatinization temperature. Therefore, the breeding program presented significant annual genetic progresses between 1972 and 2016 for the main attributes of grain quality, and made cultivars available according to the national demand for grain quality in the several segments of the rice production industry.

Details

Language :
English, Spanish; Castilian, Portuguese
ISSN :
16783921 and 0100204x
Volume :
53
Issue :
4
Database :
Directory of Open Access Journals
Journal :
Pesquisa Agropecuária Brasileira
Publication Type :
Academic Journal
Accession number :
edsdoj.9b99acb5b1f9489fbb0032890ca6feb0
Document Type :
article
Full Text :
https://doi.org/10.1590/s0100-204x2018000400007