Genealogia dos cultivares brasileiros de arroz-de-sequeiro

Silva, Edson Ferreira da; Montalván, Ricardo; Ando, Akihiko

doi:10.1590/s0006-87051999000200007

Cited by 8 publications

(8 citation statements)

References 3 publications

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“…Apesar de grande número de cultivares estarem disponíveis para essa condição de cultivo no Brasil, pesquisas realizadas na década de 1990 revelaram que a base genética do arroz de terras altas era bastante estreita (Montalván et al, 1998;Silva et al, 1999), pois apenas dez ancestrais contribuíram com mais de 72% dos genes de todas as cultivares. Para o arroz, assim como para outras grandes culturas, existe uma preocupação em relação ao estreitamento da base genética, fator que pode incorrer em vulnerabilidade às doenças e pragas.…”

Section: Introductionunclassified

“…Estudos que determinam a relação entre genótipos elites de arroz têm sido feitos por meio das genealogias (Guimarães, 1993;Rangel et al, 1996;Montalván et al, 1998;Silva et al, 1999;Silva et al, 2002), por meio de caracteres agronômicos (Morais et al, 1998) e também por meio de marcadores moleculares (Brondani et al, 2006a;Brondani et al, 2006b;Borba et al, 2009a;Borba et al, 2009b). Utilizando-se matrizes de divergência entre genótipos é possível realizar análises de agrupamento, na qual se adotam critérios para agrupar os genótipos de modo que haja homogeneidade dentro e heterogeneidade entre os grupos.…”

Section: Introductionunclassified

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Divergência fenotípica entre genótipos de arroz de terras alta

Silva

Guimarães

et al. 2011

Agraria

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RESUMOInformações sobre a divergência fenotípica entre cultivares permitem evitar a homogeneidade de cultivo, que pode resultar em vulnerabilidade a doenças e pragas. Nos programas de melhoramento genético, tais conhecimentos facilitam a escolha de genitores divergentes, os quais, quando cruzados, proporcionam maior efeito heterótico e maior variabilidade nas populações segregantes. No presente trabalho foi avaliada a divergência fenotípica entre 12 genótipos de arroz de terras altas em dois locais na Zona da Mata do Estado de Pernambuco com base em caracteres agronômicos. Foram constatadas diferenças significativas entre os genótipos para nove dos 12 caracteres estudados, sendo que para três, verificou-se interação genótipo x ambiente. A divergência variou de 0,083 a 0,583 considerando-se os genótipos dois a dois, e entre os que podem ser mais amplamente utilizados, as duas combinações com maior divergência em ambos os locais foram Rio Parnaíba x BRSMG (curinga) e Rio Parnaíba x BRS (primavera). O agrupamento mostrou maior separação do PB 5 em relação aos demais, tendo sido formados outros dois grupos bem definidos principalmente em relação ao comportamento dos genótipos em Vitória de Santo Antão.Palavras-chave: Arroz de sequeiro, caracteres agronômicos, dissimilaridade. Phenotypic divergence among upland rice genotypes ABSTRACTInformation about the genetic divergence among cultivars could be used in order to avoid the homogeneity in cultivation and the consequent vulnerability to diseases and plagues. On breeding programs, this information facilitates the choice of dissimilar parents that, when crossed, provide higher variability on segregating populations. The aim of this work was to evaluate the divergence among 12 genotypes of upland rice in two sites of Zona da Mata region in Pernambuco, Brazil, using agronomic characters. There were significant differences among the genotypes for nine of the 12 characters studied, while genotype x environmental interaction was observed for three characters. The genetic divergence ranged from 0.083 to 0.583 considering each pair of genotypes and for the genotypes that could be more widely used in both places. The highest divergence was found between Rio Parnaíba x BRSMG (curinga) and Rio Parnaíba x BRS (primavera). The genotypes clustering showed higher PB 5 separation than the other genotypes, while two other well defined groups were formed, mainly in relation to the behavior of the genotypes in Vitoria de Santo Antão, Pernambuco, Brazil.

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Section: Introductionunclassified

Divergência fenotípica entre genótipos de arroz de terras alta

Silva

Guimarães

et al. 2011

Agraria

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“…The purpose was to construct the genealogy of each cultivar for the identification of divergent ancestors. During the preparation of the genealogies, it was considered information obtained from marketing folders of varieties, websites, genealogical records of research institutes, such as the IRRI (1985IRRI ( , 1998 and CIAT (2005), and scientific articles (Dilday 1990, Rangel et al 1996, Montalván et al 1998, Silva et al 1999, Châteal and Guimarães 2002, Cutrim and Rangel 2002 , Rangel et al 2007, Cordeiro and Medeiros 2010a. Hybrid cultivars and a large part of the cultivars developed by private companies were not evaluated since their genealogical records are not disclosed.…”

Section: Methodsmentioning

confidence: 99%

“…This is estimated from the sum of the individual contributions of each ancestor in all the cultivars, according to the methodology used by Rangel et al (1996), Montalván et al (1998) and Silva et al (1999). The ancestors were classified in decreasing order of the RGC values, and the Accumulated Genetic Contribution (AGC) was estimated from the successive sum of the RGC of each ancestor.…”

Section: Methodsmentioning

confidence: 99%

Genetic base of Brazilian irrigated rice cultivars

Rabelo

Guimarães

Pinheiro

et al. 2015

Crop Breed. Appl. Biotechnol.

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“…World rice production has doubled over the past 25 years due to the use of advanced technologies such as new varieties with higher yields and better management practices (IRRI, 2017). However, estimates from the Food and Agriculture Organization of the United Nations indicate that rice production is expected to double with the aim to fulfil the world population needs over the next 50 years (Santos et al, 2006). The need for development of cultivars with greater productive potential stability of production is, therefore, evidenced.…”

Section: Introductionmentioning

confidence: 99%

Genetic diversity of high performance cultivars of upland and irrigated Brazilian rice.

Coelho¹,

Brondani²,

Hoffmann³

et al. 2017

gmr

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The objective of this study was to analyze the diversity and discrimination of high-performance Brazilian rice cultivars using microsatellite markers. Twenty-nine rice cultivars belonging to EMBRAPA Arroz e Feijão germplasm bank in Brazil were genotyped by 24 SSR markers to establish their structure and genetic discrimination. It was demonstrated that the analyzed germplasm of rice presents an expressive and significant genetic diversity with low heterogeneity among the cultivars. All 29 cultivars were differentiated genetically, and were organized into two groups related to their upland and irrigated cultivation systems. These groups showed a high genetic differentiation, with greater diversity within the group that includes the cultivars for irrigated system. The genotyping data of these cultivars, with the morphological e phenotypical data, are valuable information to be used by rice breeding programs to develop new improved cultivars.

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Genealogia dos cultivares brasileiros de arroz-de-sequeiro

Cited by 8 publications

References 3 publications

Divergência fenotípica entre genótipos de arroz de terras alta

Divergência fenotípica entre genótipos de arroz de terras alta

Genetic base of Brazilian irrigated rice cultivars

Genetic diversity of high performance cultivars of upland and irrigated Brazilian rice.

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