The Tropical Fruit Forum

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.

This winter, I sowed many hundreds of seeds of more exotic varieties such as Haruka, Shekwasha, Kabosu, and others, hoping to find hybrids with other varieties. Crossings among themselves or with rootstock varieties that have bloomed unnoticed. There is variance among the seedlings, even surprisingly so in some varieties, but so far no definitive off-type or even Poncirus-related hybrid.

In my own pollination attempts, I have found that pollination with Ichang Papeda produces hybrids in a lot of cases (off the top of my head, I would even say in all cases). This is true even for varieties that usually produce nucellar seeds. Ichang Papeda also often produces seedlings that bloom after just a few years, including hybrid seedlings. Ichang Papeda has the characteristic of blooming first on the lower branches, not like Poncirus at the top at a certain height. It seems to be a different pattern and is also appearing in some hybrids, leading to earlier flowering.

This is very promising.
My TaiTri seedlings are also among the hardiest. Sacaton Citrumelo seedlings freeze back more often, but the Taitris seedlings withstand the winter almost without damage. this year the foliage is without damage while Sacaton and 5Star seedlings are frozen back right beside them.

another Yuma in a private collection probably the one that came from Bernhard Voss



afruit

Sacaton F2 in my garden in summer



by now (Spring 2023)

Carolina Lime is an unknown seedling that came to Stan Mckenzie from Bernhard Voss. It was probably the original seedling and Stan now has the mother plant. But the parentage remains a mystery.

You are right, of course. In F1, the genes are always distributed 50:50 (in genotype). What I actually meant was that the phenotypic trait expression does not necessarily have to be 50:50.
The phenotypic expression of the poncirus genes depends very much on the dominance/recessive properties of the individual genes.
(There are also other factors)

this can be easily recognised by the colour of the new shoots. anthocyanin-free varieties are green, anthocyanin-containing ones reddish to red. anthocyanin is probably linked to the acidity of the fruit. Varieties with green shoots, i.e. anthocyanin-free varieties, tend to be low in acid.

Interesting. do you think picture 3 and 4 could be tetraploids?

Yuanjiang Papeda is quite different in fruits and leaves.
Yuanjiang Papeda is classified as Ichang Papeda

Yuanjiang Papeda
https://www.semanticscholar.org/paper/A-Newly-Discovered-Wild-Ichang-Papeda-Population-in-Chen-Jiang/066c3cbe57e36d272a3dd3103ea5b3691212d845/figure/0

Are these the mother plants?
So f.e. the first line is Tarocco rosso x Nagami?

I have had FD seedling batches with almost 100% normal growth habit.