Genetic base of Brazilian irrigated rice cultivars

Rabelo, Hudson de Oliveira; Guimarães, João Filipi Rodrigues; Pinheiro, José Baldin; Silva, Edson Ferreira da

doi:10.1590/1984-70332015v15n3a26

Cited by 9 publications

(10 citation statements)

References 14 publications

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“…However, this will only be possible as long as genetic variability is maintained. In Brazilian irrigated rice breeding programs, genotypic variability is restricted (Rabelo, Guimarães, Pinheiro, & Silva, 2015;Streck, Aguiar, Magalhães Júnior, Facchinello, & Oliveira, 2017); therefore, investigating the genetic diversity of rice genotypes is critical.…”

Section: Introductionmentioning

confidence: 99%

Self-organizing maps in the study of genetic diversity among irrigated rice genotypes

et al. 2018

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This study presents self-organizing maps (SOM) as an alternative method to evaluate genetic diversity in plant breeding programs. Twenty-five genotypes were evaluated in two environments for 11 phenotypic traits. The genotypes were clustered according to the SOM technique, with variable topology and numbers of neurons. In addition to the SOM analysis, unweighted pair group method with arithmetic mean clustering (UPGMA) was performed to observe the behavior of the clustering when submitted to these techniques and to evaluate their complementarities. Genotype ordering according to SOM was consistent with UPGMA results, evidenced by the basic structure of UPGMA groups being preserved in each group of the maps. Regarding genotype arrangement and the group neighbors, maps involving five neurons presented inferior organization efficiency compared to the six-map arrangements in both environments. It was observed that the organization pattern among the rice genotypes evaluated by the maps was complementary to the UPGMA approach, as observed in all scenarios. It can be concluded that self-organizing maps have the potential to be useful for genetic diversity studies in breeding programs.

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Section: Introductionmentioning

confidence: 99%

Self-organizing maps in the study of genetic diversity among irrigated rice genotypes

et al. 2018

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“…Thus, this release does not follow mentioned by Rabelo et al (2015) who found that the irrigated rice Brazilian cultivars have narrow genetic base. This result can be explained mainly by the intrinsic characteristics regarding the type of grain and plant architecture, the BRS AG neither has grains of the indica subspecies type nor modern-Philippine architecture.…”

Section: Performance Characteristicsmentioning

confidence: 68%

BRS AG: first cultivar of irrigated rice used for alcohol production or animal feed

Júnior

Fagundes

Franco

et al. 2017

Crop Breed. Appl. Biotechnol.

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“…Similar evidence was described by Reig-Valiente et al (2016), who showed that breeding for a specific region even tends to genetically isolate the germplasm regarding adaptability. The second reason is probably more important, as studies have named the causes for the narrowing of the genetic base of rice by genealogy records, showing that few ancestors represent the base of practically all breeding programs, and that in addition, over decades, few parents were used repeatedly in crosses, affecting the resulting variability (Rangel et al 1996, Raimondi et al 2014, Rabelo et al 2015. Regarding the datasets used in this study, it is possible to assume that the results of SNP markers are the most refined.…”

Section: Resultsmentioning

confidence: 99%

“…more than 80% of all Brazilian rice (SOSBAI 2018). In fact, studies have reported evidence for the gradual narrowing of the genetic variability among the elite cultivars grown in southern Brazil (Rangel et al 1996, Raimondi et al 2014, Rabelo et al 2015, Streck et al 2018, Streck et al 2019. However, it is important to emphasize that these studies may have applied datasets and methods with somehow restricted efficiency to evaluate the genetic variability.…”

Section: Introductionmentioning

confidence: 99%

Is the genetic variability of elite rice in southern Brazil really disappearing?

Busanello

Venske

Stafen

et al. 2020

Crop Breed. Appl. Biotechnol.

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There is a worldwide concern about a possible narrowing of the genetic base of most crops, as e.g. that of rice (Oryza sativa L.), as a result of the modern breeding practices. Thus, the purpose of this study was to investigate this phenomenon in the germplasm of elite paddy rice in southern Brazil, including frequently used accessions in crosses. The panel consisted of 91 accessions. Data of morphological traits, SNP markers and mineral content of husked and polished grain were analyzed by hierarchical clustering and principal component analysis. The SNP markers and hierarchical clustering proved most appropriate to assess the genetic variability. A narrowing of the genetic base of rice was confirmed, although a certain level of genetic variability was still found in the germplasm of elite paddy rice in south Brazilian rice, particularly for grain mineral content.

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Genetic base of Brazilian irrigated rice cultivars

Abstract: - (1965-1980, 1981-1990, 1991-2000 and 2001-2012). For each grouping, the previously described factors were also estimated. A total of 110 cultivars were studied and it was concluded that the genetic base of Brazilian irrigated rice cultivars is narrow.

Cited by 9 publications

References 14 publications

Self-organizing maps in the study of genetic diversity among irrigated rice genotypes

Self-organizing maps in the study of genetic diversity among irrigated rice genotypes

BRS AG: first cultivar of irrigated rice used for alcohol production or animal feed

Is the genetic variability of elite rice in southern Brazil really disappearing?

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