Thank you for letting me know about the attachment. I was also doing research into the possibility of crossing Thai eggplant with Carolina horsenettle (seems very possible, no grafting probably needed) and I swapped the names on those two PDFs as I was saving them. I should double check these things in the future.
This message should have the intended Physalis breeding paper quoted above.
Reproductive biology and hybridization of Physalis L. species.pdf (1.3 MB)