Self compatibility with species:
AxA is infertile
AxB is fertile
A (AxB) fertile?
I am not able to find a full copy of Yoshihiro Ueda’s Cross- and self-compatibility in various species of the genus Rosa. Does he talk about backcrossing?
J
There should be fertility with the backcross A x (A x B) in your example, given the genetic mechanism used by roses to determine self versus non-self gametes. It may not be as fertile as the A x B cross because any male gametes from the F1 offspring that carry the same self-incompatibility proteins as clone A would be thwarted in their attempt to reach the eggs.
Stefan
Is me mechanism the same in sweet cherries Prunus avium
It’s reportedly a different mechanism–in Prunus there is a self-recognition system, while in Rosa there is a non-self-recognition system. Here is some further reading:
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Much more complex and interesing than the pamphlet from 1960 that just described which cultivars of Prunus avium that were comparable. Thank you Johannes