|Kuhl, J C - DEPT OF HORT UW MADISON|
|Hanneman Jr, Robert|
Submitted to: American Journal of Potato Research
Publication Type: Abstract Only
Publication Acceptance Date: April 20, 2001
Publication Date: N/A
Technical Abstract: Many angiosperms have developed mechanisms to prevent self pollination and inbreeding. The most wide spread system self incompatibility (SI) is gametophytic, where pollen tube growth is inhibited in the style by the action of a single locus (S-locus). Similar inhibition of pollen tube growth can also be observed in interspecific crosses, where successful pollinations occur in only one direction, termed unilateral incompatibility. Unilateral incompatibility was observed in crosses between S. pinnatisectum and S. cardiophyllum progenies only when S. pinnaliseawn was used as the pistillate parent. Segregations in the BC, family backcrossed to S. cardiophyllum revealed two independent putative loci controlling unilateral incompatibility, with both putative loci inherited independent of the S-locus. However, segregation ratios in the second backcross family did not agree with those observed in the first family. Segregation disparity between the two families may be due to distorted transfer of specific alleles or the presence of different mechanisms controlling pistil and pollen recognition systems in the two species.