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Upland rice: phenotypic diversity for drought tolerance
Lanna, Anna Cristina; Coelho, Gesimária Ribeiro Costa; Moreira, Alécio Souza; Terra, Thiago Gledson Rios; Brondani, Claudio; Saraiva, Gabriel Rios; Lemos, Frederico da Silva; Guimarães, Paulo Henrique Ramos; Morais Júnior, Odilon Peixoto; Vianello, Rosana Pereira.
Afiliação
  • Lanna, Anna Cristina; Embrapa Arroz e Feijão. Santo Antônio de Goiás. BR
  • Coelho, Gesimária Ribeiro Costa; Embrapa Arroz e Feijão. Santo Antônio de Goiás. BR
  • Moreira, Alécio Souza; Embrapa Mandioca e Fruticultura. Araraquara. BR
  • Terra, Thiago Gledson Rios; Universidade Federal do Tocantins. Lab. de Plantas Infestantes. Gurupi. BR
  • Brondani, Claudio; Embrapa Arroz e Feijão. Santo Antônio de Goiás. BR
  • Saraiva, Gabriel Rios; Uni-Ahanguera. Centro Universitário de Goiás. Depto. de Ciência Exatas, Biológicas e da Saúde. Goiânia. BR
  • Lemos, Frederico da Silva; Uni-Ahanguera. Centro Universitário de Goiás. Depto. de Ciência Exatas, Biológicas e da Saúde. Goiânia. BR
  • Guimarães, Paulo Henrique Ramos; Universidade Federal de Goiás. Depto. de Genética e Melhoramento de Plantas. Goiânia. BR
  • Morais Júnior, Odilon Peixoto; Universidade Federal de Goiás. Depto. de Genética e Melhoramento de Plantas. Goiânia. BR
  • Vianello, Rosana Pereira; Embrapa Arroz e Feijão. Santo Antônio de Goiás. BR
Sci. agric ; 78(5): 1-14, 2021. tab, graf
Article em En | VETINDEX | ID: biblio-1497971
Biblioteca responsável: BR68.1
ABSTRACT
Upland rice is cultivated mostly in Latin America and Africa by small farmers and in areas with risk of dry spells. This study evaluated morphophysiological mechanisms of upland rice associated to drought adaptation. A set of 25 upland rice genotypes were grown in a plant phenotyping platform during 2015 and 2017 under regular irrigation and water restriction. We evaluated morphophysiological traits in shoots (vegetative structures growth, gas exchange, water use efficiency, carboxylation efficiency, water status) and roots (length, surface area, volume and diameter), as well as agronomic traits (grain yield and its components). There was a reduction in grain yield by up to 54 % and 58 % in 2015 and 2017, respectively, under water deficit. Five upland rice genotypes with the best yield performances in both water treatments applied were recommended to the upland rice-breeding program Bico Ganga, BRS Esmeralda, BRSMG Curinga, Guarani, and Rabo de Burro. In this study, morphophysiological traits associated to drought tolerance concerned the plant high capacity to save water in the leaves, low leaf water potential, high ability to reduce vegetative structures, high water use efficiency, high photosynthetic capacity, and improved capacity to absorb water from drying soil, either by osmotic adjustment or additional investment into the root system. Therefore, we concluded that different secondary traits contributed to drought tolerance and should be evaluated along with grain yield to improve efficiency of breeding selection.
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Texto completo: 1 Base de dados: VETINDEX Assunto principal: Oryza / Estiagem Idioma: En Revista: Sci. agric Ano de publicação: 2021 Tipo de documento: Article

Texto completo: 1 Base de dados: VETINDEX Assunto principal: Oryza / Estiagem Idioma: En Revista: Sci. agric Ano de publicação: 2021 Tipo de documento: Article