Experimental results presented here indicate that selection through male function favors smaller display sizes in Ipomoea purpurea.
Selection through male function favors smaller floral display size in the common morning glory Ipomoea purpurea (Convolvulaceae).
cfactor causing segregation distortion, such as male function (mSD), female function (fSD), or zygotic selection.
Thus, the benefits from their male function, pollen production, may offset the cost of being unpollinated.
SD loci detected in the present study were affected by male function, female function, and zygotic selection.
The most severe SD region affected by male function was detected along chromosome 3 (4.3–24.3 Mbp).
In addition to SD occurring as a consequence of female function and male function, zygotic selection was also observed to cause SD in our backcrossing populations.
Relevant with several findings of sterility loci located in this region, it is likely that male function contributes to hybrid barriers which may lead SD on chromosome 3.
Our data thus suggest three mechanisms that lead to SD, as follows: SD through female function, SD through male function, and SD through zygotic selection.
Male function (mSD) is defined if segregation ratios of those markers are significantly distorted from the expected mendelian segregation ratios in BC1F1 types conferring male-segregating population, but in its reciprocal cross was normally segregated according to mendelian pattern.
