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THE PLANT CELL, Vol 9, Issue 9 1633-1646, Copyright © 1997 by American Society of Plant Biologists

RESEARCH ARTICLE

Recombination Occurs Uniformly within the bronze Gene, a Meiotic Recombination Hotspot in the Maize Genome

H. K. Dooner and I. M. Martinez-Ferez
The Waksman Institute, Rutgers University, Piscataway, New Jersey 08855

The bronze (bz) gene is a recombinational hotspot in the maize genome: its level of meiotic recombination per unit of physical length is >l00-fold higher than the genome's average and is the highest of any plant gene analyzed to date. Here, we examine whether recombination is also unevenly distributed within the bz gene. In yeast genes, recombination (conversion) is polarized, being higher at the end of the gene where recombination is presumably initiated. We have analyzed products of meiotic recombination between heteroallelic pairs of bz mutations in both the presence and absence of heterologies and have sequenced the recombination junction in 130 such Bz intragenic recombinants. We have found that in the absence of heterologies, recombination is proportional to physical distance across the bz gene. The simplest interpretation for this lack of polarity is that recombination is initiated randomly within the gene. Insertion mutations affect the frequency and distribution of intragenic recombination events at bz, creating hotspots and coldspots. Single base pair heterologies also affect recombination, with fewer recombination events than expected by chance occurring in regions of the bz gene with a high density of heterologies. We also provide evidence that meiotic recombination in maize is conservative, that is, it does not introduce changes, and that meiotic conversion tracts are continuous and similar in size to those in yeast.


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