Integration of cytogenetic and genetic linkage maps unveils the physical architecture of tomato chromosome 2

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Title
Integration of cytogenetic and genetic linkage maps unveils the physical architecture of tomato chromosome 2
Author(s)
Dal Hoe Koo; Sung-Hwan Jo; J W Bang; H M Park; Sanghyeob Lee; D Choi
Bibliographic Citation
Genetics, vol. 179, no. 3, pp. 1211-1220
Publication Year
2008
Abstract
We report the integration of the linkage map of tomato chromosome 2 with a high-density bacterial artificial chromosome fluorescence in situ hybridization (BAC-FISH)-based cytogenetic map. The euchromatic block of chromosome 2 resides between 13 and 142 cM and has a physical length of 48.12 μm, with 1 μm equivalent to 540 kb. BAC-FISH resolved a pair of loci that were 3.7-3.9 Mb apart and were not resolved on the linkage map. Most of the regions had crossover densities close to the mean of ∼200 kb/cM. Relatively hot and cold spots of recombination were unevenly distributed along the chromosome. The distribution of centimorgan/micrometer values was similar to the previously reported recombination nodule distribution along the pachytene chromosome. FISH-based physical maps will play an important role in advanced genomics research for tomato, including map-based cloning of agronomically important traits and whole-genome sequencing.
ISSN
0016-6731
Publisher
Genetics Society America
DOI
http://dx.doi.org/10.1534/genetics.108.089532
Type
Article
Appears in Collections:
1. Journal Articles > Journal Articles
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