Citrus > Cold Hardy Citrus
Recreating the grapefruit - C. maxima X Morton, troyer, poncirus, kumquat, Moro,
Curiousgardener23:
Till, I think that breeding the low acid genes into hardy citrus is a really cool thing to do and hope that you have good results. This was actually the reason why I asked if the African Shadock x Poncirus was low acid because I was hoping the African Shadock was a lower acid pomelo. I found a paper from 2009 looking at nucellar embryony (apomixis)
in Citrus maxima × Poncirus trifoliata and it seemed that the researchers crossed Chandler (mother) and “Rubidoux” and “Webber Fawcett” (pollen). Then looked at the nucellar embryony rates in the population. The title was "AFLP markers closely linked to a major gene essential for nucellar embryony (apomixis) in Citrus maxima × Poncirus trifoliate". It seems to me it would have been really valuable if the researchers had tasted the hybrids to identify low acid populations that had low nucellar embryony that could have been released for breeding of low acid cold hardy citrus (likely not an objective of the research though so probably didn't/wouldn't happen).
Lauta_hibrid:
To add something interesting, I made a cross that I never saw the result of, I think I have the largest amount of kumquat hybrids that exist hehe. and I still need more. it is Kumquat Nagami x C. maxima. it is the smallest citrus (well, kumquat hindssi it would be, but it is not edible, although in the future I will cross it too 😁). the idea was to create a giant kumquat, or something with edible skin... we will see what happens. the strange thing is that the leaf morphology (it is the only thing we can analyze for now), the kumquat has leaves with short and articulated petioles, but hindssi and meiwa usually throw out leaves without articulated. Nagami also does it sometimes... so my question is what would happen in this genetic fight? well, it seems that both messages collide, since leaves without articulated, articulated and some with half articulated and wings and half without articulated appeared. I thought that the message of dividing the leaf into 2, foot and blade, and the extension of the first part like wings, would be something that occurs separately, but it seems that the message is mixed up and what on one side are well-separated wings on the other is part of the blade... I don't know what you think, it surprised me.
The latter is the leaf of a young C. maxima plant.
Till:
These leave forms are interesting. Let's see what dominates at the end. It may be that the plant finally decides to prefer a certain leaf form. I had a seedling of Limequat Tavares, father plant supposedly Yuzu, that had long petioles weakly winged. The Yuzu influence was quite clear. But after about 20cm it decided to produce non-winged leaves. The opposite happens with C. ichangensis leaves. Sometimes they are first not winged and later they are.
Regarding low acidity: Yes, I think that is something we should try. Siamese Sweet and it hybrids are the varities that have been scientificly proven heredity patters. Sucrena may also be interesting but has different genetics. For those that are interested: See https://citrusgrowersv2.proboards.com/thread/728/inheritance-low-acidity. We discussed the inheritance of acidless varieties there.
Aside from the inheritance of strictly acidless varieties it may also be helpful to take notice of acidity levels in hybrids between normal sweet varieties and Poncirus or C. ichangensis. When I began with citrus breeding I was told by the literature that all such crosses were sour. But my present impression is that high acidity levels are often not inherited in a strictly dominant fashion. Morton is quite sweet, Swingle 5 Star is sour but not extremly so. Similar another citrumelo of mine. The same can be said of PT #7 and HRS899 Q/O. Keraji mandarine should be further checked. Its offspring Staraji is sweet. Perhaps that is not just good luck but result of very special genes of Keraji mandarine. We need more hybrids to check that.
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