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Messages - kumin

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Cold Hardy Citrus / Re: F2 citrange winter hardiness trial
« on: February 23, 2024, 09:35:22 AM »
An update on the Winter survival of various selections. In most of the cases Deciduous selections have a better appearance than Evergreen ones.

Segentrange 128 shows excellent hardiness having been unprotected outdoors for nearly 6 years. It hasn't fruited yet.

Segentrange D has been outdoors for the past several years and hasn't fruited to this point.

Conestoga 001 is quite hardy, but reluctantly deciduous. It hasn't fruited yet.

Conestoga 010 is fully deciduous and has fruited. It produces a mixture of zygotic and nucellar seedlings.

Bishop seedlings exhibiting variation in cold resistance.

Poncirus Plus hasn't shown any cold damage.

Conestoga 006 has fruited and shows good cold hardiness. It's seedlings are a mixture of zygotic and nucellar plants.

Conestoga 011 is tetraploid and hasn't fruited yet. It's among the hardiest selections.

Conestoga 067 shows hardiness very similar to Bishop Citrandarin. It produces mixed leaf types including monofoliate.

Cold Hardy Citrus / Re: F2 Citrandarin (X-639) winter hardiness trial
« on: February 21, 2024, 07:53:24 PM »
I suspect it might be a form of approach grafting. However, there may be considerable uncertainty as to which are successful vs failures. I'd only consider it if I lacked grafting skills.

Cold Hardy Citrus / Re: F2 Citrandarin (X-639) winter hardiness trial
« on: February 21, 2024, 03:57:37 PM »
There were a number of actual grafts. In a number of cases I had to break the knitted tissue apart. There was some variation in the degree of the knitting of the roots.

Cold Hardy Citrus / Re: F2 Citrandarin (X-639) winter hardiness trial
« on: February 21, 2024, 03:00:12 AM »
To save time during the initial transplanting from the germination bed to the field trial rows, I planted 4 seedlings per divot. This placed them tightly together. A slight space between plants should have been adequate for separation after a year. In fact, most were easily separated, but not all were.

Cold Hardy Citrus / Re: F2 Citrandarin (X-639) winter hardiness trial
« on: February 20, 2024, 06:37:54 PM »
A bit of advice from my project: avoid planting the seedlings so close together that they root-graft to one another. This should eliminate the issue of hardy roots allowing less hardy seedlings to survive. At this point I am still uncertain as to the status of several of my trees in regards to true hardiness.

Cold Hardy Citrus / Re: F2 citrange winter hardiness trial
« on: February 09, 2024, 03:20:04 PM »
Various selections exhibiting a percentage of Zygotic seedlings:

The crooked stems are caused by growing up against the plastic cover.

Cold Hardy Citrus / Re: F2 citrange winter hardiness trial
« on: January 29, 2024, 03:23:39 PM »
I suspect being Deciduous complements existing hardiness, but it's also beneficial in reducing desiccation due to a reduction in exposed vulnerable tissue during winter. Initially, being trifoliate, deciduous and cold tolerant are likely linked as they're inherited from Poncirus. However, these linkages should gradually be broken in future generations. There are already examples of some of the Poncirus tastes being less prominent in advanced generations. In my experience, acidity tends to linger into F² generations. Pathways have been proposed on this forum to move beyond such acidity.

Cold Hardy Citrus / Re: F2 citrange winter hardiness trial
« on: January 28, 2024, 03:04:47 PM »
Boris, there are numerous evergreen, as well as, partially evergreen seedlings. Conestoga 058 and 067 are largely monofoliate and haven't fruited yet. 058 develops reddish - purple coloration during the Winter. 067 is a bit hardier than Bishop, while 058 is a bit less hardy.

Conestoga 067 grafted on Poncirus and exposed to outdoor environment.

Meyer lemon X Citrange hybrids.

Meyer lemon X 026 Segentrange.

Conestoga 058 displaying reddish coloration during Winter.

Cold Hardy Citrus / Re: F2 citrange winter hardiness trial
« on: January 28, 2024, 06:48:09 AM »

Conestoga 026 was the first to flower and fruit and has similar hardiness to 006, 010 and 011.

Bishop Citrandarin is slightly less hardy than the Conestoga selections, but has better fruit color and flavor.

Another Conestoga 026 grafted tree.

Conestoga 006 among the hardiest.

The deciduous characteristic isn't necessarily all or nothing. A few plants in a mixed population will lose their green color early and subsequently drop all their leaves. Another portion of the population will drop their oldest leaves early, later followed by the younger leaves. Other trees will retain their leaves until new growth begins in the Spring. The leaves will be heavily damaged by this point.

There's a tendency for trees to retain their leaves as juveniles, then drop them more reliably as the tree matures.
Deciduous trees should suffer less stress, especially in regards to Winter leaf dessication.
There are, however additional factors involved. An example is whether the overwintering buds are of the Poncirus type with well defined bud scales, or the less well developed Citrus type of bud.
One of my selections is quite stem hardy, but has less cold hardy buds. This leads to the first Spring flush of leaves being pale colored with distorted leaf form. Subsequent flushes have normal color and shape.

To prevent self-pollination all anthers should ideally be removed from the seed parent flowers prior to dehiscence. Bagging with fine mesh bags excludes insects from bringing in donor pollen.
Donor pollen from the desired source is deposited onto the receptive seed parent stigma. In some cases the stigma produces a moist film on the surface when receptive.

Starburst pomelo seedlings at present. Appear to be very similar. Perhaps homozygous? Pomelos are predicted to be Zygotic, these may not be?

Cold Hardy Citrus / Re: F2 citrange winter hardiness trial
« on: January 07, 2024, 02:03:30 PM »
Additional seedlings showing variation indicative of zygotic embryony

Conestoga 004 Shows variable seedling characteristics

The presence of considerable variation among the questionable C-35 seedlings leads me to lean against the parent tree actually being a nucellar C-35 seedling. Being zygotic would be highly desirable for my goals. Although the juice is very tart, the fruit has low seediness, large size and is very productive. It's actual hardiness remains to be proven.

Conestoga 021 also shows seedling variation

Citrus General Discussion / Re: Which rootstock do i have
« on: January 02, 2024, 03:49:34 PM »
Are you able to take a close up photo of the stem from the soil to the first branches? Meyer lemon ist often propagated on its own roots.

Cold Hardy Citrus / Re: F2 citrange winter hardiness trial
« on: December 31, 2023, 06:51:50 AM »
Zygotic seedlings shortly after germination:

Bishop Citrandarin seedlings exhibiting appreciable variation.


 Meyer lemon seedlings pollinated by 5* Citrumelo pollen.

Thanks, it's quite interesting and I was not aware of this phenomenon.

The closest I've come to seeing similar foliage on seedlings I've grown has been when I over fertilized on one occasion and used Coconut Coir as seed starting media on another occasion. Unless Coconut Coir is properly buffered it can harbor high salt content, which I understand must be buffered rather than rinsed out.In both cases I was able to salvage some of the seedlings by unpotting them and rinsing them before replanting them into fresh media of different composition.

I strongly suspect your plants were exposed to some sort of nutritional imbalance. Another possibility might be light deprivation during the earlier phases of germination.

The 100% Zygotic seedling figure is interesting, not merely because it increases the number of potential plants under evaluation, but more importantly, it eliminates expending resources on clones that can't contribute to the goal of edible zone 6 Citrus.
It's not unusual to have a population of seedlings in mixed Zygotic/Nucellar plantings that are difficult to place definitively in the correct grouping.
In regards to these seeds, hopefully they're mature enough to germinate.


Here's a photo of the Starburst pomelo seedlings that I'm starting to grow. All appear to have normal chlorophyll.

Cold Hardy Citrus / Re: PT-plusXValentine cross
« on: December 30, 2023, 09:02:08 AM »
Ilya, what time duration do you subject the seedlings to -8C? Do you do any cold pre-exposure prior to the testing? Your procedure certainly could reduce time, space and materials expended on doomed seedlings. Thanks

Being a slightly immature F¹ Poncirus hybrid, I didn't detect any sweetness, Second generation seedlings might have a percentage of sweeter fruiting selections as well as hardier individuals.

There were self pollinated as well as cross pollinated fruits. The cross pollinated fruits tended to be slightly larger.

Albino seedlings can be avoided by using an appropriate Fungicide, or removing the seedcoat at the time of planting.

1279 fruits and seeds. The fruits weren't totally ripe, but neither the rind nor the juice had much Poncirus taste or fragrance. The predominant flavor was indicative of Mandarin. There were many empty seed coats and partially filled seeds. The majority of the seeds were tan in color, with a lower percentage of green seeds. When the juice was diluted and sweetened there was no discernable Poncirus initial taste, nor aftertaste. The flavors weren't exactly Mandarin with a bit of an underripe effect. There were an average of 6.8 plump seeds per fruit, disregarding the tiny seedless fruit.

I haven't opened them yet, I'll do so within the next 2 weeks.

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