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Cytogenet Genome Res 2010;129:24–34

Structural Differences in Chromosomes Distinguish Species in the Tomato Clade

Anderson L.K. · Covey P.A. · Larsen L.R. · Bedinger P. · Stack S.M.

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Department of Biology and Program in Plant Molecular Biology, Colorado State University, Fort Collins, Colo., USA

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Lorinda Anderson

Department of Biology and Program in Plant Molecular Biology

Colorado State University

Fort Collins, CO 80523-1878 (USA)

Tel. +1 970 491 4856, Fax +1 970 491 0649, E-Mail lorinda.anderson@colostate.edu

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The tomato clade of Solanaceae is composed of 12 species that are all diploid with the same chromosome number and morphology. Species in the tomato clade are considered to have evolved primarily by genic changes rather than large-scale chromosomal rearrangements because pachytene chromosomes in F1 hybrids synapse normally along their lengths and linkage maps of intra- and inter-specific hybrids are co-linear. However, small inversions have been reported between tomato and some of its wild relatives. Therefore, we reevaluated 5 F1 hybrids using high-resolution, electron microscopic examination of pachytene chromosome (= synaptonemal complex) spreads to determine whether any minor structural changes had occurred among species in the tomato clade, which were not easily visible using light microscopic analysis of conventional chromosome squashes. Our study revealed a number of unexpected synaptic configurations such as mismatched kinetochores, inversion loops and reciprocal translocations. Most of these structural differences were in or close to heterochromatin that has comparatively few genes and little recombination, so they would be expected to have little effect on the evident colinearity of linkage maps, especially in euchromatin. However, these results demonstrate that substantial changes in chromosome structure have occurred among species within the tomato clade.

© 2010 S. Karger AG, Basel

Article / Publication Details

First-Page Preview
Abstract of Chromosomal Diversity

Published online: June 11, 2010

Number of Print Pages: 11
Number of Figures: 5
Number of Tables: 2

ISSN: 1424-8581 (Print)
eISSN: 1424-859X (Online)

For additional information: http://www.karger.com/CGR

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