Glochid Fingers wrote:If i was to take a pollenated opuntia flower bud and graft it to a hylocereus what would be the outcome? Could it potentially survive and turn into a very large healthy fruit with massive seeds? Should i go for it?
If the graft would take, and I'm not sure that it would with such an ephemeral tissue type as floral tissue, all you would get is an Opuntia flower on a Hylocereus. I think you are imagining some sort of hybridization would take place through the tissues fusing or something. However all of the floral and ovary tissue would be of the Opuntia, therefore the only thing the flower would "know" how to be is an Opuntia. Were you to pollinate the flower the fruit would be Opuntia too. Even if you could magically pollinate the Opuntia flower with Hylocereus pollen you would still get an Opuntia fruit. The seeds would be the only hybrid part of it (and only because of this hypothetical pollination, not because of the grafting).
Also, I'm not sure I understand what you mean by "pollinated Opuntia flower bud". If the flower was still in bud it wouldn't have been pollinated yet.