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Hi Mikkel,Hi Ilya,
An interesting observation. How old was citrumelo rootstock?
Walt, my "Holy Grail" would be a zygotic Conestoga series tree.In my experience, pollination by Ichang Papeda often resulted in zygotic seeds. even in otherwise nucellar varieties. (But this is only anecdotal and not confirmed!).
One green world in Portland has some really great maypop varieties. I got a bluePop from them last year, it flowered a bunch but didn't set fruit.
https://onegreenworld.com/product-category/vines/passiflora/
I understand the Australians have one as well, but it's noted to struggle. Not so much that it dies, but it's not exactly happy about it, either.
The Microcitrus x Poncirus hybrids
Also this is a desire of mine: large, sweet and glochidless opuntia
In my experience the proportion of zygotic seeds in partially nucellar varieties also depends on the pollinizator.Ichang Papeda as pollen donor often leads to zygotic offspring, at least in my experience.
They have the one poncirus x orange that is an edible f1 hybrid.
This one seems promising. It's cold hardy.
https://www.oscartintori.it/en/prodotto/otaheite-orange/
Actually I just saw on the website in Europe they have a lot of meyer lemon crosses.Hi 1rainman, do you have a link?
It would be interesting to know if Poncirus polyandra has the same fruit characteristic as trifoliata.
If so, the resinous fruits might not be related to winter hardiness. because polyandra is much less winter hardy than trifoliata.
This would raise the hope that one could breed out these characteristics and still retain a hardy plant.
It's not the cleanest article (there are some noteworthy typos), but...
https://www.sciencedirect.com/science/article/pii/S0888754323000617
This suggests polyandra has cold-signaling genes and at least the potential for increased cold-hardiness relative to citrus. How much is unstated, and they never explicitly compare it to trifoliata.
Kunming is at about 6000 ft. I've seen it called zone 9b, but that seems contradictory given it snows there.