Do you think a Citrus × Aegle marmelos Intergeneric Hybrid is possible?

[Nosari7Viper]

Do you think a Citrus × Aegle marmelos Intergeneric Hybrid is possible?, or a Citrus x Triphasia trifolia Hybrid, or maybe even a Citrus x Citropsis articulata Hybrid?

[steven92]

Hybrids between Citrus and Citropsis have been created both in Australia and Japan.

Have a look at this paper: First Fruiting Intergeneric Hybrids between Citrus and Citropsis (DOI: 10.21273/JASHS.138.1.57).

[Nosari7Viper]

Thank you very very much for telling me about the Citropsis × Citrus Hybrid.

[mikkel]

I am not sure if it has already been tried with Aegle, I have only read about Citropsis, like in the link above.
So far, such intergeneric crosses have not been successful, except with wakonai as a parent.
wakonai is unfortunately not available.

[Marcin]

Citropsis x Citrus crosses may work.

Hybrid seedling of Citropsis schweinfurthii x 'Nanpu' tangor:
https://www.researchgate.net/figure/The-seedling-obtained-from-the-cross-between-Citropsis-schweinfurthii-and-Nanpu-tangor_fig3_279488113

Results from: Cross-compatibility between Aurantioideae plants (1985). What didn't work: true Citrus x: Glycosmis, Murraya, Triphasia, Atalantia, Hesperethusa. Pummelo x Citropsis schweinfurthii produced two small seeds (which didn't germinate).

[Nosari7Viper]

Thank you all for telling me info on Citrus Hybrids, This has been very helpful and interesting, so they tried making a Citrus x Triphasia Hybrid but it didn't work out, could it be possible that the Hybrid didn't work out because of the combination of specific genes it was getting from the pollen were not compatible, but if a person were to pollinate multiple flowers could it be possible the pollen on one of those flowers could have the right combination of genes to eventually lead to producing a hybrid?

[Marcin]

One can always try, but I guess that Triphasia is cross-incompatible with Citrus. Maybe a better idea would be to try crosses within the subtribe Citrinae. For example, crosses of Severinia buxifolia with Sunki mandarin worked.
https://www.scielo.br/j/gmb/a/hvkGJXWZnYhgzSpbHQJ6bDk/?lang=en

Already tested cross-combinations within Aurantioieae, successful and failed. From: https://escholarship.org/uc/item/1904r6x3

[bussone]

I suppose it's possible, but you probably will need to walk it along a bunch of intermediary hybrids to do so.

I think the most distant citrus hybrid is with citropsis, which it seems to like more than atalantia and severinia (possible, see Medina) which are more closely-related. However, aegle is graft-compatible for citrus. It doesn't do well, but it doesn't just die, either. Somatic hybrids have been done as far out as Murraya, which is more distant than Aegle.

https://www.scielo.br/j/gmb/a/hvkGJXWZnYhgzSpbHQJ6bDk/?lang=en&format=html

I'm inclined to think it would either take a somatic hybrid if you wanted to do it directly, or something like (citrus x citropsis) x (aegle x citropsis) to do it sexually, assuming that latter hybrid is even possible. You may need a third hybrid to get aegle genetics into citropsis.

[Lauta_hibrid]

In a cladogram it seemed that Citrus is closer to Limonia and Marmelos than to Citopsis, so it would seem that it would be more compatible. I once found some crossbreeding exercises but the only objective was to find seeds, and yes, they were obtained. Regarding Triphasia, it is unknown... last year I managed to get seeds of the limequat Eutis x Triphasia (on the other hand, it did not form fruit). Although the limequat is mono-embryonic, I discovered with practice that it usually forms nuclear seeds very occasionally. In this case, it formed all nuclear seeds, 🥲. And Nagami, which was my hope, did not form seeds in any fruit. Neither did Lemon. Those are my hobbyhorses. I would have to try Citrus Maxima, which gives me 24 nuclear seeds. Now I am trying to pollinate Ginberry x Nagami, but it would be more compatible (according to the cladogram) with Murraya or Wampi.

[bussone]

In a cladogram it seemed that Citrus is closer to Limonia and Marmelos than to Citopsis, so it would seem that it would be more compatible. I once found some crossbreeding exercises but the only objective was to find seeds, and yes, they were obtained. Regarding Triphasia, it is unknown... last year I managed to get seeds of the limequat Eutis x Triphasia (on the other hand, it did not form fruit). Although the limequat is mono-embryonic, I discovered with practice that it usually forms nuclear seeds very occasionally. In this case, it formed all nuclear seeds, 🥲. And Nagami, which was my hope, did not form seeds in any fruit. Neither did Lemon. Those are my hobbyhorses. I would have to try Citrus Maxima, which gives me 24 nuclear seeds. Now I am trying to pollinate Ginberry x Nagami, but it would be more compatible (according to the cladogram) with Murraya or Wampi.

Zanthoxylum americanum x citrus (ponderosa lemon) has been tried.
https://conservancy.umn.edu/server/api/core/bitstreams/265baba7-1f8b-417a-8c64-cf4368f92ef7/content

It generated seeds in the citrus that sprouted, but the grant ran out of funding before any tracking of the sprout could be performed. It was strongly suspected the seeds were apomictic. If nothing else, it did demonstrate that fruit generation can be triggered by pollen from distant relations.

[Nosari7Viper]

Thank you all very very much for the info.