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Molecular mapping of the centromeres of tomato chromosomes 7 and 9

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Abstract

The centromeres of two tomato chromosomes have been precisely localized on the molecular linkage map through dosage analysis of trisomic stocks. To map the centromeres of chromosomes 7 and 9, complementary telo-, secondary, and tertiary trisomic stocks were used to assign DNA markers to their respective chromosome arms and thus to localize the centromere at the junction of the short and long arms. It was found that both centromeres are situated within a cluster of cosegregating markers. In an attempt to order the markers within the centric clusters, genetic maps of the centromeric regions of chromosomes 7 and 9 were constructed from F2 populations of 1620Lycopersicon esculentum × L. pennellii (E × P) plants and 1640L. esculentum × L. pimpinellifolium (E × PM) plants. Despite the large number of plants analyzed, very few recombination events were detected in the centric regions, indicating a significant suppression of recombination at this region of the chromosome. The fact that recombination suppression is equally strong in crosses between closely related (E × PM) and remotely related (E × P) parents suggests that centromeric suppression is not due to DNA sequence mismatches but to some other mechanism. The greatest number of centromeric markers was resolved in theL. esculentum × L. pennellii F2 population. The centromere of chromosome 7 is surrounded by eight cosegregating markers: three on the short arm, five on the long arm. Similarly, the centric region of chromosome 9 contains ten cosegregating markers including one short arm marker and nine long arm markers. The localization of centromeres to precise intervals on the molecular linkage map represents the first step towards the characterization and ultimate isolation of tomato centromeres.

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Authors and Affiliations

  1. Department of Plant Breeding and Biometry, Cornell University, 252 Emerson Hall, 14853, Ithaca, NY, USA

    A. Frary, G. G. Presting & S. D. Tanksley

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  1. A. Frary
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  2. G. G. Presting
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  3. S. D. Tanksley
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Communicated by R. G. Herrmann

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Frary, A., Presting, G.G. & Tanksley, S.D. Molecular mapping of the centromeres of tomato chromosomes 7 and 9. Molec. Gen. Genet. 250, 295–304 (1996). https://doi.org/10.1007/BF02174387

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  • DOI: https://doi.org/10.1007/BF02174387

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