Summary
The recombination fraction between the interstitially located gene an and interchange 303 of rye was found to be 0.244±0.038 in a test cross using the translocation as the male parent. In first metaphase translocation configurations in pollen mother cells of the same plant, the chiasma frequency between an and the translocation breakpoint was found to be significantly more than twice the recombination fraction. Recombination was concluded to be masked by a difference in the alternate frequency between configurations without interstitial chiasmata and configurations with interstitial chiasmata, the effect of the first type being of major importance. Random centromere orientation of translocation multivalents with interstitial chiasmata was concluded to be a realistic assumption. The exceptionally high recombination between an and translocation 303 is discussed. Consideration is also given to the use of interchanges in the establishment of a marker's chromosomal position, and to the use of translocation chromosomes in balanced systems for hybrid breeding purposes.
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Communicated by H. F. Linskens
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de Vries, J.N. High recombination between the breakpoint of a reciprocal translocation in rye (Secale cereale L.) and an interstitially located gene. Theoret. Appl. Genetics 66, 329–339 (1983). https://doi.org/10.1007/BF00251168
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DOI: https://doi.org/10.1007/BF00251168