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Messages - Ilya11

Pages: [1] 2 3 ... 17
1
Cold Hardy Citrus / Re: F2 citrange winter hardiness trial
« on: February 04, 2019, 03:15:35 AM »
At least some of them will sprout from the roots. For me, the most promising is  the last plant, for the first three the stems are already damaged.

2
Cold Hardy Citrus / Re: F2 citrange winter hardiness trial
« on: February 02, 2019, 05:18:54 AM »
Poncirus contains several gene regions responsible for its freeze resistance and its genome is highly heterozygous. That is why  F1 hybrids with citrus are showing a large variation for winter hardiness.
Three hundreds of its F1 hybrids with very frost sensitive pummelo show a wide distribution of freeze damage.

 article



Quite possible that C35 citrange inherited a rather unfavorable set of gene alleles from its poncirus parent explaining its poor winter performance.

3
Cold Hardy Citrus / Re: F2 citrange winter hardiness trial
« on: February 01, 2019, 06:26:06 PM »
At least  all your C35 nucellar seedlings will be dead, C35 is probably the least hardy of all citranges.

4
Cold Hardy Citrus / Re: Anyone Showing Success in @0F?
« on: February 01, 2019, 09:57:46 AM »
It was in a garden of John Saia in Sterling, Virginia.
Since US852 is giving many off-types , it is probably one of them.

5
Cold Hardy Citrus / Re: Citsuma Prague
« on: January 30, 2019, 05:56:07 PM »
I protected Jubea from moist during its first 8 years, not now because it is too large. Occasionally the tip of a new spear is frozen, but the plant recovers rapidly. My Butia odorata was nearly destroyed in 2012 and 2017 but recovered last summer.

6
Cold Hardy Citrus / Re: Citsuma Prague
« on: January 30, 2019, 04:09:21 AM »
The climate in Paris region  is very close to that of Seattle, but a little bit drier and more sunny. My garden has 30 years average of minimals of -9C, exactly in the middle of USDA  z8, while downtown Paris is now zone 9 due to the urban heat.
I have a dozen of palm species including 20 year old Jubea.

7
Cold Hardy Citrus / Re: Anyone Showing Success in @0F?
« on: January 30, 2019, 03:55:52 AM »
US 852, which a hybrid between Changsha mandarin and trifoliate, can survive 0 F, is tolerably edible, although it does still have a little bit of the trifoliate taste.
The plant that you refers to in Sterling, Virginia is  dead after two seasons with 0F nights.

In my garden Citrumelo 5star and Ichanquat 6-7-2 were not damaged without any protection after -16C (3F) nights and two weeks with frozen soil and even flowered next season. Citsuma Prague showed some twig damage but survived. The worst damage was on own rooted Thomasville that lost most of its trunk.

8
Cold Hardy Citrus / Re: F2 citrange winter hardiness trial
« on: January 29, 2019, 12:06:52 PM »
Thank you, I am quite convinced that for the robust hardiness beyond zone7, the citrus hybrid should drop its leaves in autumn. Among my F1xcitrus seedlings such plants are extremely rare.

9
Cold Hardy Citrus / Re: Citsuma Prague
« on: January 29, 2019, 09:54:48 AM »
Ilya11, on your pic from 11/26/18, is that oleander behind your citsuma?
Yes, it is a cold resistant oleander, it is in ground for four years, some twigs were damaged last two seasons when we had arctic blasts for two weeks with night temperatures around -9C, but plants were  flowering in a summer and even gave some seeds.

10
Cold Hardy Citrus / Re: F2 citrange winter hardiness trial
« on: January 29, 2019, 09:46:09 AM »
Kumin,
I wonder if you observed the seedlings with  tendency of autumn leaf yellowing/falling ?

11
Cold Hardy Citrus / Re: Citsuma Prague
« on: January 29, 2019, 09:41:01 AM »
I have a question: the cold resistance of satsuma is -8C, so if the chimera goes to -12C what could happen? The sastuma cells wil dead and the next year the plant will become a poncirus?
Winter resistance is a property of entire multicellular  plant organism, it only partially depends on component cells due to the  interaction between them and presence of common biochemical compounds in circulating sap.
That is why the periclinal chimeras are quite stable.

12
Cold Hardy Citrus / Re: F2 citrange winter hardiness trial
« on: January 27, 2019, 03:54:43 AM »
I then removed them and stratified the seed coat for 30 minutes, followed by neutralizing the solution and rinsing them thoroughly.
Kumin,
I do not understand what do you mean by stratification? Certainly not cold treatment, may be washing soda incubation?
Your brute force approach is very impressive, hopefully it will produce some hybrids as resistant as poncirus. Still, most of the freeze damage occurs in spring when small stem cracks begin to be infected.

13
Cold Hardy Citrus / Re: Hardy citrus growing in Switzerland
« on: January 26, 2019, 04:42:21 PM »
J is very different, it is entirely monofoliate

14
Cold Hardy Citrus / Re: F2 citrange winter hardiness trial
« on: January 26, 2019, 02:48:24 PM »
HamlinxFD is certainly not hardy in zone 6.

I wonder if citrandarins like US852 are  better choice for such large scale testings. I guess 5-10 mother plants will give sufficient quantities of starting seeds.

For the germination, from my experience, the best method is perlite/buggy approach used for palm seeds.
Seeds are germinated in zip locked plastic bag in moist, but not wet perlite at 25C. After germination seedlings can be transplanted in common pots to grow under artificial light and transplanted in  spring in the open ground.
I am germinating each season around thousand of seeds  by this method (my record is 3000), selection to discard nucellar seedlings  and plants with poncirus aftertaste in leaves can be done very early, before open ground planting.

15
Cold Hardy Citrus / Re: Trifoliate hybrid ID
« on: January 26, 2019, 01:23:41 PM »
Ok, I see. That makes sense. Mine is grafted. But then I am not convinced the above plant is Thomasville since almost all of its leaves are trifoliate (although on some the two side leaflets are very small).
I am also not sure, but the closest  thing that I have seen is Thomasville. This plant, obviously low grafted on poncirus is way too vigorous.

16
Cold Hardy Citrus / Re: Trifoliate hybrid ID
« on: January 25, 2019, 03:01:10 AM »
Lower branches  of  Thomasville as well as strongly growing new shoots have trifoliate leaves, while on the top and on flowering twigs they are single.

17
Cold Hardy Citrus / Re: Trifoliate hybrid ID
« on: January 24, 2019, 01:03:01 PM »
Looks like a Thomasville.

18
Yuzu is to some extent polyembryonic, that is some of your seedlings are more or less exact copies of mother variety. The rest are probably also Yuzus if the fruit comes from a farm growing mostly yuzus.
If you want to have exactly the same Yuzu variety, keep the strongest seedling among twins coming from a single seed. The seedlings are more or less easy to separate, since they are individual plants having distinct root systems.
You can also buy mature grafted plants from  several European nurseries  like Eisenhut or Lenzi

19
Poncirus grafted onto rootstock in November bloomed before setting out new growth under grow lights.  Could someone share the link about flower initiation on Poncirus and standard citrus?

link

20
Cold Hardy Citrus / Re: A few super-hardy C. ichangensis hybrid seedlings
« on: January 19, 2019, 04:17:38 AM »
Ichanquat 6-7-2 is 100% zygotic, moreover approximately one third of its seeds contain embryos with green cotyledons like those of kumquat.

21
You are probably mixing up pomelo and grapefruit.
Chandler is a pomelo and has very large petioles like all Citrus maxima varieties.

22
Cold Hardy Citrus / Re: Long term cold hardy citrus breeding project
« on: January 14, 2019, 01:59:00 PM »
The fruit parent was Swamp Lemon.

23
Cold Hardy Citrus / Re: More unusual/obscure cold hardy citrus hybrids
« on: January 14, 2019, 04:32:38 AM »
This  fruit is from a plant grown from  Eyeckr seed. It is in Nikitsky Botanical garden in Crimea, zone 8b.
The fruit was harvested in November and when I got it as a New Year gift it was  rather dry inside, but with a very good ratio of sugar/acids, no bitter taste, no off-flavors.

24
Cold Hardy Citrus / Re: Long term cold hardy citrus breeding project
« on: January 14, 2019, 04:15:37 AM »
Beaucoup :)
Rather poor germination rate, from 5 pollinated flowers I got 178 fully developed seeds, after one month of germination at 27C in perlite, only 72 of them are germinated, that is very unusual. Nevertheless, more than half are hybrids by appearance.

25
Cold Hardy Citrus / Re: More unusual/obscure cold hardy citrus hybrids
« on: January 13, 2019, 10:17:31 AM »
I got recently this  Ventura fruit from a friend in Ukraine.


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