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Integrated genetic map of citrus based on RAPD markers

Published online by Cambridge University Press:  15 September 2005

Roberto Pedroso de Oliveira,
Mariângela Cristofani and
Marcos Antonio Machado
Roberto Pedroso de Oliveira
Affiliation:
Embrapa-Centro de Pesquisa Agropecuária de Clima Temperado (CPACT), PO Box 403, 96001-970, Pelotas-RS, Brazil
Mariângela Cristofani
Affiliation:
Centro APTA Citros ‘Sylvio Moreira’ / IAC, PO Box 04, 13490-970, Cordeirópolis-SP, Brazil
Marcos Antonio Machado
Affiliation:
Centro APTA Citros ‘Sylvio Moreira’ / IAC, PO Box 04, 13490-970, Cordeirópolis-SP, Brazil
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Abstract

Introduction. The citrus industry is one of the main activities of Brazilian agriculture. Several pests and diseases have threatened citrus culture in recent years. Genetic mapping is one of the most efficient strategies for conducting advanced genetic studies by facilitating plant selection guided by markers. The objective of this study was to construct an integrated genetic map between Citrus sinensis (L.) Osbeck cv. ‘Pêra’ and C. reticulata Blanco cv. ‘Cravo’ using two different types of segregation of markers. Materials and methods. The linkage analyses were conducted with segregation data obtained from 256 RAPD markers in a population of 94 hybrids. Analyses were performed through the software JoinMap, LOD ≥ 6.0, θ ≤ 0.25, and the Kosambi function. Results and discussion. The linked map between the two cultivars had 217 markers defined by 15 linkage groups, covering 527 cM. This map had five linkage groups with common markers of ‘Pêra’ and ‘Cravo’. The inclusion of new markers would increase the number of linkage groups with markers from both parents, thus making their number equal to the haploid chromosome number. The alterations in the order and in the distances among the markers, due to the presence or absence of bridging markers in the linkage map, are discussed.

Keywords

Citrus reticulataCitrus sinensisgenetic mapsgenetic markersRAPDCitrus reticulataCitrus sinensiscarte génétiquemarqueur génétiqueRAPD

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Type
Research Article
Information
Fruits , Volume 60 , Issue 3 , May 2005, pp. 187 - 193
Copyright
© CIRAD, EDP Sciences

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