Genetic parameters and QTL for tolerance to flooded soils in maize



Document title: Genetic parameters and QTL for tolerance to flooded soils in maize
Journal: CBAB. Crop breeding and applied biotechnology
Database: PERIÓDICA
System number: 000242831
ISSN: 1518-7853
Authors: 1

2

Institutions: 1Empresa Brasileira de Pesquisa Agropecuaria, Porto Velho, Rondonia. Brasil
2Universidade Federal de Pelotas, Pelotas, Rio Grande do Sul. Brasil
Year:
Season: Sep
Volumen: 5
Number: 3
Pages: 287-293
Country: Brasil
Language: Inglés
Document type: Artículo
Approach: Experimental
English abstract Flooding tolerance is important for maize in southern Brazil. Polypeptides involved in glycolysis and fermentation are generally tolerance-related. Objective of this work was to associate markers for tolerance to flooding in maize. One hundred and seventeen F3 families were phenotyped for shoot (SDM) and root (RDM) dry matter and 74 were selectively genotyped with 44 microsatellite markers. A single marker analysis was performed to detect QTL. Analysis of variance indicated the presence of significant genetic variability for both traits. Three markers were associated to SDM and two to RDM. For SDM the loci involved were glutamine synthetase (chromosome 5, R2=0.16), zein (chromosome 4, R2=0.15), and triosephosphate isomerase (chromosome 3, R2=0.14). For RDM, zein (chromosome 4, R2=0.11) and triosephosphate isomerase (chromosome 3, R2=0.11) were associated. Multiple loci analysis indicated R2=0.32 for SDM and R2=0.19 for RDM, indicating that a fraction of the genetic variation present in F2 was explained by the analyzed markers
Portuguese abstract Tolerância ao encharcamento em milho é importante no sul do Brasil. Geralmente, polipeptídios envolvidos na glicólise e fermentação estão relacionados à tolerância. O objetivo deste trabalho foi associar marcadores à tolerância ao encharcamento em milho. Cento e dezessete famílias F3 foram fenotipadas para matéria seca da parte aérea (SDM) e da raiz (RDM) e 74 genotipadas com 44 microsatélites. Uma análise com marcas simples foi realizada para a detecção de QTL. A análise de variância indicou variabilidade genética para ambos os caracteres. Três microsatélites foram associados à SDM e dois à RDM. Para SDM os locos envolvidos foram glutamina sintetase (cromossomo 5, R2 =0,16), zeína (cromossomo 4, R2 =0,15) e triosefosfato isomerase (cromossomo 3, R2 =0,14). Para RDM, zeína (cromossomo 4, R2 =0,11) e triosefosfato isomerase (cromossomo 3, R2 =0,11) foram associadas. A análise múltipla apresentou R2 =0,32 para SDM e R2 =0,19 para RDM, indicando que uma fração da variância genética presente na F2 foi explicada pelos marcadores analisados
Disciplines: Agrociencias
Keyword: Fitotecnia,
Plantas para uso industrial,
Genética,
Maíz,
Zea mays,
Parámetros genéticos,
Microsatélites
Keyword: Agricultural sciences,
Crop husbandry,
Plants for industrial use,
Genetics,
Maize,
Zea mays,
Genetic parameters,
Microsatellites
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