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Messages - Ilya11

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Cold Hardy Citrus / Re: F2 citrange winter hardiness trial
« on: September 20, 2023, 03:11:11 AM »
Yes, it was a pollen source. Young 20 cm seedling resisted -8C 6 hours artificial freezing without leaf damage.

Cold Hardy Citrus / Re: F2 citrange winter hardiness trial
« on: September 19, 2023, 11:25:01 AM »
Hi Mikkel,
An interesting observation. How old was citrumelo rootstock?
In Paris region nucellar seedlings of 5star start to flower when 6 years old.
5starXDunstan seedlings are in the open ground in a South of France. They are from spring 2020 pollination and most are 170 cm tall.
At this place I have  5starXAmbersweet seedling from 2019 that flowered this spring and even kept one fruit.

Cold Hardy Citrus / Re: F2 citrange winter hardiness trial
« on: September 19, 2023, 04:01:03 AM »
Probably also abundant fruit set, lack of  bitter taste, early ripening.
And most important is the combination of all this in one variety.
It seems that all these features are polygenic and not dominant.
I have a hardy population of about a hundred seedlings from 5starXDunstan cross.
Only two of them have non bitter taste in their leaves.

Cold Hardy Citrus / Re: Poncirus hybrid crosses
« on: August 23, 2023, 04:27:24 PM »
Thomasville is fertile as a pollen partner.

Citrus General Discussion / Re: New Kumquat Variety?
« on: August 17, 2023, 03:32:37 AM »
For crossing purposes does it behave like a diploidor tetraploid?
Probably as a tetraploid, as the juice sacs are of the same layer as embryos.

Citrus General Discussion / Re: New Kumquat Variety?
« on: August 05, 2023, 01:22:04 PM »
It is a new chimeric diploid/tetraploid variety from China

Cold Hardy Citrus / Re: These survived -10 F
« on: July 25, 2023, 10:09:45 AM »
With sufficient protection you can probably cultivate mango at your place.

Cold Hardy Citrus / Re: These survived -10 F
« on: July 25, 2023, 01:55:53 AM »
Poncirus trifoliata and Flying dragon can both go down to -25F and survive.
No way, even -25C (-13F) is at the limit of its resistance.

Cold Hardy Citrus / Re: Fast flowering trifoliate graft
« on: June 25, 2023, 01:32:24 PM »
Yes, these flowers have plenty of pollen , also some are fully developed with pistil that is rather unusual for the first flowering of FFPT. Out of 6 seedlings 4 has flowers and possibly one fruit has been formed.
In the past I failed to produce hybrids with this strain that are also  fast flowering.
Even FDXFFPT with  straight thorns that should be definitely  zygotic are not flowering early.

Citrus General Discussion / Re: On extremely compact seedlings.
« on: June 25, 2023, 01:17:21 PM »
Very unusual seedling indeed. Also has apparently serrated leave margins, no visible petiole; very untypical for Yuzu.
I have a hybrid seedling (5star citrumeloXCocktail) that has another type of compact shape. Up to 6 month age it has normal growth, but than all new leaves become  very small with extremely short internodes.


This spring some well developed leaves appeared again.

Cold Hardy Citrus / Re: Fast flowering trifoliate graft
« on: June 19, 2023, 09:08:02 AM »
9 month old FF PT
Sidlings are ~10 cm high .

There is a rich literature on these two subjects

It is also very important to know if parent plants are parthenogenetic (giving fruits without pollination), self-compatible or belonging to the particular type of pollen compatibility.

INRA collection in Corsica has approximately 800 different citrus varieties.

Citrus General Discussion / Re: USDA says silicon helps citrus
« on: May 26, 2023, 03:49:30 AM »
Very confusing indeed. The rest of the world is using a Latin word silicium.
They probably mean the soluble compounds of silicon like amorphous SiO2 or silicates.



In my experience the proportion of zygotic seeds in partially nucellar varieties also depends  on the pollinizator.

Citrus General Discussion / Re: Unknown citrus pest
« on: May 23, 2023, 03:45:03 AM »
Photo is not clear, but if it looks like this:

it is a spider mite infestation

Cold Hardy Citrus / Re: F2 citrange winter hardiness trial
« on: May 17, 2023, 04:59:36 PM »
First four leaves of nucellar 5star seedlings are often monofoliate.

Cold Hardy Citrus / Re: Hybrid Nin-Kat-MandarinXPoncirus
« on: May 17, 2023, 03:31:22 AM »
Probably, I got the immature budwood from Zitrusgaertner labeled as PTxSunki in 2012.
 First flower and one fruit in 2021

No protection and it has never been  damaged.

Cold Hardy Citrus / Re: Hybrid Nin-Kat-MandarinXPoncirus
« on: May 16, 2023, 04:11:40 AM »
This spring my PTxSunki has become crazy with flowers

Citrus General Discussion / Re: how true-to-seed is true-to-seed?
« on: April 25, 2023, 09:46:19 AM »
Maintaining overly strict variety identity can lead to them to become genetic artefacts.

I was not sure to understand this phrase especially in the context of loosing Cider Apple popularity.
But ChatGPT explained it to me:
This phrase suggests that if a particular variety of a plant or animal is maintained too strictly, without allowing for any genetic variation or diversity, it can become a genetic artifact. In other words, if the identity of the variety is too narrowly defined and preserved, it may lose important genetic traits that could make it more resilient or better adapted to changing environmental conditions.

Maintaining genetic diversity is crucial for the survival of any species, as it enables them to adapt to changes in their environment, resist diseases and pests, and cope with climate change. Without genetic diversity, a species may become vulnerable to environmental stressors, leading to population declines or even extinction.

Therefore, the phrase is suggesting that maintaining strict variety identity without allowing for genetic variation can be detrimental to the long-term survival of the species or variety.
 An excellent explanation indeed  :)

Citrus General Discussion / Re: Poncirus
« on: April 23, 2023, 03:59:20 AM »
A very strange choice by AusCitrus of using highly zygotic strain of poncirus for rootstock propagation.

Cold Hardy Citrus / Re: Poncirus hybrid crosses
« on: April 21, 2023, 06:10:43 PM »
In the past we discussed on several occasions this idea to keep selection on F1 level  by crossing different F1 hybrids and selecting them initially  for  better freeze resistance with subsequent search for better than poncirus fruit quality.
In  a spring 2020 I pollinated several hundreds of 5star citrumelo flowers by Dunstan pollen.
It resulted in 53 fruits giving a little bit more than 1500 seeds. Germination rate was rather high and I eliminated most of nucellar 5star seedlings by tasting their leaves.
Eventually it produced ~1000 seedlings grown under lamps under high density to the size of ~15 cm high. In January next year they were exposed to our winter conditions with few night frosts and daytime temperatures around 5C.
After that they were subjected to the gradual  artificial freezing that included  10 hours  at 0C , 2 hours at -3.5C and 3 hours at -8C. At this stage, neither  nucellar 5star nor Dunstan seedlings are able to survive.  Eighty eight hybrid survivors were planted in the open ground and for the moment I have around 80 plants, some of them reaching 150 cm height.
Most are trifoliates of different morphology, 2 are mostly monofoliates,

 six showing autumn leaf bronzing and partial leaf drop.

By tasting leaves I observed that for 4 plants  their leaves lack bitterness .

Cold Hardy Citrus / Re: Winter damage, Yuma citrange F2
« on: April 18, 2023, 04:04:13 AM »
Very interesting project David, resembling what is achieved by kumin.
 I wonder what is your attrition rate and how these survived seedlings are different from poncirus in appearance.

Matty, how do you explain the all albino seedlings I got from the variegated satsuma fruits. I got 100% albinos, that seems unusal to me. I have other variegated citrus seeds I planted and they hardly have only some albino seedlings.
As pagnr mentioned there were multiple sources of variegation in plants. The type observed in  your variegated satsuma was due to periclinal chimerism.
Basically the citrus leaves are derived from three layers of cells. One of them (L2) is mutant in this variety and does contain cells without chlorophyll.

The cells from this layer also compose nucellus, the tissue that gives nucellar seeds most common in satsumas. That is why these  seedlings are white.
The FD partially albino seedling above is most probably due to fungal infection and finally will become completely white and will die. This is rather common in poncirus seedlings.

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