Crossover Interference in Arabidopsis

Corresponding author: F. W. Stahl, 1229 University of Oregon, 1370 Franklin Blvd., Eugene, OR 97403-1229., fstahl{at}molbio.uoregon.edu (E-mail)

Communicating editor: M. E. ZOLAN

The crossover distribution in meiotic tetrads of Arabidopsis thaliana differs from those previously described for Drosophila and Neurospora. Whereas a chi-square distribution with an even number of degrees of freedom provides a good fit for the latter organisms, the fit for Arabidopsis was substantially improved by assuming an additional set of crossovers sprinkled, at random, among those distributed as per chi square. This result is compatible with the view that Arabidopsis has two pathways for meiotic crossing over, only one of which is subject to interference. The results further suggest that Arabidopsis meiosis has >10 times as many double-strand breaks as crossovers.

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