Rice Breeding in Latin America

Martínez, César; Torres, Edgar; Châtel, Marc; Mosquera, Gloria; Duitama, Jorge; Ishitani, Manabu; Selvaraj, Michael Gomez; Dedičová, Beata; Tohmé, Joe; Grenier, Cécile; Lorieux, Mathias; Cruz, Maribel; Berrio, Luis E.; Corredor, Edgar; Martin, Gonzalo Zorrilla de San; Breseghello, F.; Peixoto, Orlando; Filho, J. M. Colombari; Castro, Adriano Pereira de; Lopes, Sérgio Iraçu Gindri; Barbosa, M. C.; Funck, Gustavo Rodrigo Daltrozzo; Blanco, Pedro; Vida, Fernando Pérez de; Molina, Federico; Rosas, Juan; Martínez, Sebastián; Bonnecarrère, Victoria; Garaycochea, Silvia; Carracelas, Gonzalo; Marin, A. R.; Correa-Victoria, F. J.; Camargo, Ismael; Bruzzone, C.

doi:10.1002/9781118916865.ch05

Cited by 25 publications

(41 citation statements)

References 71 publications

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“…In both methods, the first three generations are conducted in a single location under good environmental conditions (Santo Antonio de Goi as, GO). Currently, the modified pedigree method achieves a yield gain of 2.66% per cycle (Martinez et al, 2014), but it has a tendency to reduce drought tolerance (Pinheiro et al, 2006;Silveira et al, 2015). This implies in exposing the progenies to different local weather conditions, including F I G U R E 6 Cumulative probability density function (CDF) and frequencies of occurrence for upland rice stress profiles (SP) in the historical period (top row) and in 2,050 for RCP 2.6 (middle row) and RCP 8.5 (bottom row) for all three environment groups: least favorable environment (LFE, left column), favorable environment (FE, middle column), and highly favorable environment (HFE, right column).…”

Section: Breeding Implications Of Changes In Environment Groups Andmentioning

confidence: 99%

“…Primavera) occurred in the breeding program, whereas in the late 1990s, wide hybridizations were carried out, introducing indica genes into a predominant japonica background with a significant increase in yield potential especially under highly favorable conditions (Martinez et al, 2014). While Primavera is currently used as a check cultivar in the conventional breeding program and is hence representative of genotypes released to the public, clearly, as a result of the breeding process at Embrapa, changes have occurred and will continue to occur in the characteristics of the germplasm released and grown by farmers in the last 30-40 years, leading to the changes in the environments and stress patterns.…”

Section: Breeding Implications Of Changes In Environment Groups Andmentioning

confidence: 99%

“…This strategy aims to select high-yielding elite lines with the capacity to respond favorably to changes in the environment (i.e., with wide adaptation) and at the same time to have a highly predictable performance in different environmental conditions (Colombari Filho et al, 2013). Currently, the modified pedigree method achieves a yield gain of 2.66% per cycle (Martinez et al, 2014), but it has a tendency to reduce drought tolerance (Pinheiro et al, 2006;Silveira et al, 2015).…”

Section: Shifted Growing Conditions and Breeding Priorities For Uplmentioning

confidence: 99%

“…Douradão) to releasing modern cultivars (e.g., cv. Primavera) occurred in the breeding program, whereas in the late 1990s, wide hybridizations were carried out, introducing indica genes into a predominant japonica background with a significant increase in yield potential especially under highly favorable conditions (Martinez et al, 2014). These activities have resulted in cultivars with longer growing cycle and lower root length density, but generally less drought tolerance (Breseghello et al, 2011;Pinheiro et al, 2006).…”

Section: Breeding Implications Of Changes In Environment Groups Andmentioning

confidence: 99%

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Breeding implications of drought stress under future climate for upland rice in Brazil

Ramírez-Villegas

Heinemann

Castro

et al. 2018

Global Change Biology

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Rice is the most important food crop in the developing world. For rice production systems to address the challenges of increasing demand and climate change, potential and on-farm yield increases must be increased. Breeding is one of the main strategies toward such aim. Here, we hypothesize that climatic and atmospheric changes for the upland rice growing period in central Brazil are likely to alter environment groupings and drought stress patterns by 2050, leading to changing breeding targets during the 21st century. As a result of changes in drought stress frequency and intensity, we found reductions in productivity in the range of 200-600 kg/ha (up to 20%) and reductions in yield stability throughout virtually the entire upland rice growing area (except for the southeast). In the face of these changes, our crop simulation analysis suggests that the current strategy of the breeding program, which aims at achieving wide adaptation, should be adjusted. Based on the results for current and future climates, a weighted selection strategy for the three environmental groups that characterize the region is suggested. For the highly favorable environment (HFE, 36%-41% growing area, depending on RCP), selection should be done under both stress-free and terminal stress conditions; for the favorable environment (FE, 27%-40%), selection should aim at testing under reproductive and terminal stress, and for the least favorable environment (LFE, 23%-27%), selection should be conducted for response to reproductive stress only and for the joint occurrence of reproductive and terminal stress. Even though there are differences in timing, it is noteworthy that stress levels are similar across environments, with 40%-60% of crop water demand unsatisfied. Efficient crop improvement targeted toward adaptive traits for drought tolerance will enhance upland rice crop system resilience under climate change.

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Section: Breeding Implications Of Changes In Environment Groups Andmentioning

confidence: 99%

Section: Breeding Implications Of Changes In Environment Groups Andmentioning

confidence: 99%

Section: Shifted Growing Conditions and Breeding Priorities For Uplmentioning

confidence: 99%

Section: Breeding Implications Of Changes In Environment Groups Andmentioning

confidence: 99%

See 2 more Smart Citations

Breeding implications of drought stress under future climate for upland rice in Brazil

Ramírez-Villegas

Heinemann

Castro

et al. 2018

Global Change Biology

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“…Since the end of the 1980s, Empresa Brasileira de Pesquisa Agropecuária (Embrapa) has used this method in its rice breeding program (Martínez et al, 2014). For autogamous species, most breeding programs develop endogamic lines (cultivars) originating from biparental populations, so that self-fertilization from F 2 allows a limited recombination; therefore, some favorable genic combinations are maintained at very low frequencies, which makes selection impossible (Ramalho et al, 2012).…”

Section: Introductionmentioning

confidence: 99%

Genetic variability during four cycles of recurrent selection in rice

Júnior

Melo

Morais

et al. 2017

Pesq. agropec. bras.

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-The objective of this work was to estimate genetic and phenotypic parameters among progenies of the CNA6 population of upland rice (Oryza sativa) for grain yield and plant height in four cycles of recurrent selection, in order to evaluate the genetic variability and the genotype × location interaction. The experimental data were obtained from yield trials of S 0:2 progenies, which were carried out in the experimental design of Federer's augmented blocks, without replications for progenies within each location. The effect of S 0:2 progenies was significant in all cycles for grain yield and in the first three cycles for plant height, indicating the maintenance of the population's genetic potential to generate transgressive progenies. The participation of the component of the progeny × location interaction in phenotypic variance was of high magnitude. The genetic variability of the CNA6 population of upland rice is maintained for grain yield and plant height during the four cycles of recurrent selection.Index terms: Oryza sativa, genotype × environment interaction, population improvement, quantitative genetics, variance components. Variabilidade genética durante quatro ciclos de seleção recorrente em arrozResumo -O objetivo deste trabalho foi estimar parâmetros genéticos e fenotípicos entre progênies da população CNA6 de arroz (Oryza sativa) de terras altas para os caracteres produtividade de grãos e altura de plantas, em quatro ciclos de seleção recorrente, para análise da variabilidade genética e da interação genótipo × local. Os dados experimentais foram obtidos de ensaios de rendimentos de progênies S 0:2 , conduzidos em delineamento experimental de blocos aumentados de Federer, sem repetição para progênies por local. O efeito de progênies S 0:2 foi significativo em todos os ciclos para produtividade de grãos e nos três primeiros ciclos para altura de plantas, o que é indicativo da manutenção do potencial genético da população em gerar progênies transgressivas. A participação do componente da interação progênie × local na variância fenotípica foi de alta magnitude. A variabilidade genética da população CNA6 de arroz de terras altas quanto à produtividade de grãos e à altura de plantas é mantida durante os quatro ciclos de seleção recorrente.Termos para indexação: Oryza sativa, interação genótipo × ambiente, melhoramento populacional, genética quantitativa componentes de variância.

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CGIAR modeling approaches for resource‐constrained scenarios: I. Accelerating crop breeding for a changing climate

et al. 2020

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Crop improvement efforts aiming at increasing crop production (quantity, quality) and adapting to climate change have been subject of active research over the past years. But, the question remains 'to what extent can breeding gains be achieved under a changing climate, at a pace sufficient to usefully contribute to climate adaptation, mitigation and food security?'. Here, we address this question by critically reviewing how model-based approaches can be used to assist breeding activities, with

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Rice Breeding in Latin America

Cited by 25 publications

References 71 publications

Breeding implications of drought stress under future climate for upland rice in Brazil

Breeding implications of drought stress under future climate for upland rice in Brazil

Genetic variability during four cycles of recurrent selection in rice

CGIAR modeling approaches for resource‐constrained scenarios: I. Accelerating crop breeding for a changing climate

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