Genetics, Vol 141, 683-708, Copyright © 1995

INVESTIGATIONS

Two-Dimensional Spreads of Synaptonemal Complexes from Solanaceous Plants. VI. High-Resolution Recombination Nodule Map for Tomato (Lycopersicon esculentum)

J. D. Sherman and S. M. Stack
Department of Biology, Cell and Molecular Biology Program, Colorado State University, Fort Collins, Colorado 80523

We have produced a high-resolution physical recombination map for tomato chromosomes by determining the frequency and distribution of recombination nodules (RNs) on tomato synaptonemal complexes (SCs). We present evidence that there is a 1:1 relationship between RNs and chiasmata. Every SC has at least one RN. There are no RNs at the ends of SCs, in kinetochores, or in the heterochromatic short arm of SC 2 that carries the nucleolus organizer. RNs are more common per unit length of SC in euchromatin compared with SC in heterochromatin. The average number of RNs per SC and the average number of RNs per SC arm are directly correlated with the length of SC in euchromatin. When SCs have only one RN, that RN occurs on the long arm more frequently than predicted based on SC arm length. Patterns of multiple RNs on SCs indicate RN (crossover) interference. RNs probably can occur anywhere on SCs in euchromatin, but RNs are not distributed randomly along SCs in euchromatin or in heterochromatin. The lengths of tomato's physical recombination (RN) map, classical genetic linkage map, and molecular linkage map all differ from each other for a variety of reasons.

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