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Mapping of yield-related QTLs in pepper in an interspecific cross of Capsicum annuum and C. frutescens

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Abstract

An advanced backcross QTL study was performed in pepper using a cross between the cultivated species Capsicum annuum cv. Maor and the wild C. frutescens BG 2816 accession. A genetic map from this cross was constructed, based on 248 BC2 plants and 92 restriction fragment length polymorphism (RFLP) markers distributed throughout the genome. Ten yield-related traits were analyzed in the BC2 and BC2S1 generations, and a total of 58 quantitative trait loci (QTLs) were detected; the number of QTLs per trait ranged from two to ten. Most of the QTLs were found in 11 clusters, in which similar QTL positions were identified for multiple traits. Unlike the high percentage of favorable QTL alleles discovered in wild species of tomato and rice, only a few such QTL alleles were detected in BG 2816. For six QTLs (10%), alleles with effects opposite to those expected from the phenotype were detected in the wild species. The use of common RFLP markers in the pepper and tomato maps enabled possible orthologous QTLs in the two species to be determined. The degree of putative QTL orthology for the two main fruit morphology traits—weight and shape—varied considerably. While all eight QTLs identified for fruit weight in this study could be orthologous to tomato fruit weight QTLs, only one out of six fruit shape QTLs found in this study could be orthologous to tomato fruit shape QTLs.

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Acknowledgements.

This research was supported by The Israel Science Foundation (Grant no. 643/00) and by Hazera Genetics.

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Authors and Affiliations

  1. Department of Plant Genetics and Breeding, Agricultural Research Organization, The Volcani Center, P.O. Box 6, Bet Dagan 50250, Israel

    G. U. Rao, A. Ben Chaim, Y. Borovsky & I. Paran

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  1. G. U. Rao
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  2. A. Ben Chaim
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  3. Y. Borovsky
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  4. I. Paran
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Correspondence to I. Paran.

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Communicated by J. Dvorak

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Rao, G.U., Ben Chaim, A., Borovsky, Y. et al. Mapping of yield-related QTLs in pepper in an interspecific cross of Capsicum annuum and C. frutescens . Theor Appl Genet 106, 1457–1466 (2003). https://doi.org/10.1007/s00122-003-1204-5

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  • DOI: https://doi.org/10.1007/s00122-003-1204-5

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