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Messages - mikkel

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Cold Hardy Citrus / Re: Yuzu Ichang Papeda cross
« on: May 10, 2021, 04:51:51 PM »
@Zitrusgaertner Bernhard Voss has an Ichang Papeda at a similiar size of yours. And hardy since years.
Where did you get your plant from?

Cold Hardy Citrus / Re: Is precociousness inherited?
« on: March 09, 2021, 04:34:10 PM »
Red Dwarf, a precocious FD

Cold Hardy Citrus / Re: Is precociousness inherited?
« on: March 09, 2021, 09:16:59 AM »
I won`t suspect F1 hybrids with the precocious Poncirus to be precocious as well. But it might be an option to backcross the F1 with prec.Pt or another precocious variety.

Concerning C.wakonai I was reported:
Our recent results here suggest that the early-flowering trait is quickly lost during a backcrossing program (backcrossing to C.reticulata), even when we try to apply high selection pressure for early-flowering.  So I suspect there are recessive allelels involved in early-flowering and it will be necessary to ensure both parents have an early-flowering parent in their pedigree.

It might be similiar with precPt.

I was wondering about if it is an option to to create an edible precocious Citrus first and cross it with precPt or Red Dwarf from Jiri. If genes for precociousness are the same in both parents it might give a chance to find a homozygous hybrid.

Citrus General Discussion / Re: monoembryony inheritance question
« on: February 15, 2021, 02:27:12 AM »
Some Ichang Papedas seedlings and hybrids have even a shorter juvenile stage. I found seedligs of Lime Ichang, Citron Ichang, N1tri flowering within the first year. But only once. It is not stable. But some reached full maturity at the age of 4.
Bernhard Voss told me that he selected all his Ichang Papeda hybrids by early flowering. He said it happens quite often.
It is definately a path I will follow.
Lets hope this winter hasn`t killed them....

Cold Hardy Citrus / Re: F2 citrange winter hardiness trial
« on: February 13, 2021, 08:16:10 AM »
I don't think backcrossing would lead to lower winter hardiness in every case, certainly in most cases, but in exceptions there might be a chance. Hardiness is not only controlled by one gene, but backcrossing could also work with several genes. It just has lower chances... but it has higher chances of sorting out the right genes than mixing them with other sources.... at least in theory...
In practice I would go both directions...

Citrus General Discussion / Re: monoembryony inheritance question
« on: February 12, 2021, 05:00:27 PM »
Most of the hybrids I have made have been with Ichang Papeda. Either as mother or as pollen donor. I have not found any polyembryonic seeds. I suspect that Ichang papeda has some ability to produce zygotic seeds.
But of course it is possible that I have only used zygotic mother plants by chance.

Cold Hardy Citrus / Re: F2 citrange winter hardiness trial
« on: February 12, 2021, 04:48:45 PM »
   At this point...

just ideas:
It would be interesting to backcross it to the orange parent,  maybe as a side project beside your plans.
You could take HRS899A into your consideration too. It is an F2 Changsha x P.t. hybrid quite hardy and has good fruits as far as I heard about.

Thanks Ilya!
So if I understand it right even the roots were frozen at -9°C? That is even more encouraging.

Citrus General Discussion / Re: US145
« on: December 30, 2020, 02:32:48 PM »
this means that US145 backcrossed with Thong Dee produced higher rates of seedlings with edibility and cold hardiness (combined in the same seedling) than backcrosses of other Poncirus hybrids.

Actually I have already done this cross. It produced more than 200 hybrid seedlings that in spring were exposed to artifical freezing at -9C for 2 hours. Two dozens survived, three had no damage at all.

Did you kinda prepare the seedlings before the freeze? Like slowly cooling down?
Did you freeze the whole plant with roots?
Thank you!

My impression is that it is even more important to produce a large quantity of hybrid seedlings than the parent combination.
Regardless of which combination one choose, it might be a good strategy to backcross hybrids. e.g. a hybrid with good fruit quality but low frost tolerance with the hardy parent and a hardy but non-edible hybrid with the citrus parent. But one must always produce a lot of seedlings and select the best ones. Anything else would be a stroke of luck.
From the point of view of backcrossing, citrumelos would be best crossed with pomelos.

Everything else will work too, but if one want to cross in a certain trait, backcrossing is a way to plan.
However, onecan also just get lucky and find the desired traits in a random cross.
a contra is that pumelos take a very long time until maturity... so backcrossing is very long term strategy. So random crosses and large numbers of seedlings might be a better option in this case... when you consider your time...
But in any case, the chances increase the more seedlings are produced.

long talk short sense Bloomsweet x Citrumelo sounds good.

Cold Hardy Citrus / Re: HRS 899 experiences ?
« on: December 21, 2020, 04:12:19 PM »
Robert, (zitrusgärtner) has a fruiting 899A.

Citrus Buy, Sell, & Trade / Re: Red fingerlime seeds
« on: December 18, 2020, 04:13:39 AM »
I just wonder about the precociousness of (formerly) Microcitrus. Some say it takes very long until the first flower, but e.g. Ethan Nielsen, which worked professionally with it said it is sometimes flowering in it 1st year.

Any experiences?

Citrus Buy, Sell, & Trade / Re: Grand Frost Lemon
« on: November 08, 2020, 10:27:48 AM »
I just want to point out that Grand Frost (being derived from Ichang lemon) almost certainly would not be able to survive in Germany zone 7.

this is not my intention.

Citrus Buy, Sell, & Trade / Re: Grand Frost Lemon
« on: November 05, 2020, 02:43:41 PM »
oh, is it you Petar?

Citrus Buy, Sell, & Trade / Re: Grand Frost Lemon
« on: November 05, 2020, 02:42:05 PM »
In fact, there are three of us.

Citrus Buy, Sell, & Trade / Grand Frost Lemon
« on: November 04, 2020, 04:45:05 AM »
Does anyone have a Grand Frost and can share seeds?

Thank you!

Cold Hardy Citrus / Re: N1triVoss
« on: October 12, 2020, 01:59:20 PM »
In 2017 one of the N1tri seedlings made a tiny fruit

Cold Hardy Citrus / Re: Kumquat x Poncirus
« on: October 12, 2020, 03:28:18 AM »
thanks for posting!
Do you still have the Reale mandarinquat x Flying dragon Poncirus habrids?

Cold Hardy Citrus / Re: Long term cold hardy citrus breeding project
« on: September 24, 2020, 04:18:01 PM »
What is the supposed hardiness of US1279, US 1281 and US 1282?

Cold Hardy Citrus / Re: Long term cold hardy citrus breeding project
« on: September 24, 2020, 04:12:18 PM »
That sounds good!
Do you know US145  a descendant of Thong Dee?It is reported by the UCR that it produces hybrids without off-flavours.  Could be useful in some way.

As for precociousness, it seems that precocious flowering is somehow related to inbreeding, probably because of the recessive alleles (my amateurish interpretation). If this is the case, then F1 hybrids would never develop this trait (even if it were still genetically present).
The only way to force precocious F1 hybrids would be to use a precocious edible variety as crossing partner. ( Which would only work if the precocious trait has the same genetic base as in prec. Poncirus).
A citrus with recessive precocious traits could already work. With a correspondingly high number of seedlings something could be found.
The only problem will be to know which citrus carries these recessive alleles.
A hybrid of several semi-edible citrus could work more reliably as a crossing partner. But this will cost time.

I have learned from Malcolm Smith that hybrids from breeding trials with early flowering Wintersii and Wakonai have lost early flowering after a few generations.

Cold Hardy Citrus / Re: F2 citrange winter hardiness trial
« on: September 24, 2020, 01:40:18 PM »
It is really impressive how fast they grow. Have you ever thought of using paclobutrazol to trigger flowering?
Ilya has done some research on this.

Cold Hardy Citrus / Re: Pomelo in the snow
« on: September 13, 2020, 01:36:22 PM »
but for me the video looks very "produced". It does not seem to be a documentation.

Cold Hardy Citrus / Re: N1triVoss
« on: September 07, 2020, 03:39:44 PM »
The flowers on my N1tri seedlings were at the tips of the shoots and were normally formed. But I never had a second flower on such a plant.

He is living in the eastern US

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