, Volume 30, Issue 2, pp 227-238

First online:

The theoretical proportion of the donor genome in near-isogenic lines of self-fertilizers bred by backcrossing

  • P. StamAffiliated withDepartment of Genetics, Agricultural University
  • , A. C. ZevenAffiliated withInstitute of Plant Breeding (IvP), Agricultural University

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The length was estimated of the chromosome segment with the desired marker gene introgressed from a donor by backcrossing into a recurrent parent. It was found that, for instance, for a chromosome with a length of 100 cM the length of the segment is 32 cM in BC6.

These estimates were compared with those made by Hanson (1959). Two corrections proved to be necessary.

The implications for breeders and researchers are discussed. Differences between two near-isogenic lines often ascribed to the difference in genotype at the marker locus, may also be caused by genes linked to the marker gene and ‘dragged’ into the backcross product.

Index words

Backcross near-isogenic line length of donor chromosome segment