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Genetics, Vol 146, 1101-1113, Copyright © 1997
INVESTIGATIONS |
Region-Specific Cis- and Trans-Acting Factors Contribute to Genetic Variability in Meiotic Recombination in Maize
MCP. Timmermans, O. P. Das, J. M. Bradeen and J. Messing
Present address: Department of Biology, Yale University, New Haven, CT 06520-8104.
Understanding the genetic basis for variability in recombination rates is important for general genetic studies and plant-breeding efforts. Earlier studies had suggested increased recombination frequencies in particular F(2) populations derived from the maize inbred A188. A detailed phenotypic and molecular analysis was undertaken to extend these observations and dissect the responsible factors. A heritable increase in recombination in the sh1-bz1 interval was observed in these populations. A factor causing an approximate twofold increase mapped to the A188 Sh1-Bz1 region, behaved as a dominant, cis-acting factor, affected recombination equally in male and female sporogenesis and did not reduce the wellstudied complete interference in the adjacent bz1-wx interval. This factor also did not increase recombination frequencies in the c1-sh1 and bz1-wx intervals, demonstrating independent control of recombination in adjacent intervals. Additional phenotypic analysis of recombination in the c1-sh1 and bz1-wx intervals and RFLP analysis of recombination along chromosomes 7 and 5 suggested that heritable factors controlling recombination in these intervals act largely independently and in trans. Our results show that recombination in these populations, and possibly maize in general, is controlled by both cis- and transacting factors that affect specific chromosomal regions.
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