Author Topic: F2 citrange winter hardiness trial  (Read 55097 times)

Ilya11

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Re: F2 citrange winter hardiness trial
« Reply #450 on: August 25, 2022, 03:18:10 AM »
Interesting, I checked now my plants and all of them including poncirus varieties have green scales that are not very prominent for the moment. 
When do you think the difference starts to emerge? At the leaf fall?
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kumin

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Re: F2 citrange winter hardiness trial
« Reply #451 on: August 25, 2022, 04:01:37 AM »
Today's photos of a Conestoga #128 twig showing developing scale covered brown buds. This tree is strongly deciduous and has minimal late growth flushes.
128 has never been protected in any manner.

This tree hasn't flowered yet.



« Last Edit: August 25, 2022, 01:10:20 PM by kumin »

Ilya11

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Re: F2 citrange winter hardiness trial
« Reply #452 on: August 25, 2022, 02:30:20 PM »
Not with my plants, could be more sun in your place.
I  suspects that this coloration could be due to the induction of anthocyanins that arrives in autumn  in poncirus leaves.
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kumin

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Re: F2 citrange winter hardiness trial
« Reply #453 on: August 26, 2022, 10:26:16 AM »
Outdoor F Segentranges in late Summer.



Conestoga 006 1 year since planting. On Poncirus rootstock. Flowered in May, no fruit set.


Conestoga 011 tetraploid, no flowers to this point. Very hardy.



Conestoga 010 very hardy, has flowered, no fruit set.


Another 010


Conestoga 001 semi-deciduous, initial Spring flush of leaves are distorted no bark splitting.


A-026 Segentrange precocious and hardy. The original tree has flowered and fruited.
« Last Edit: August 26, 2022, 12:03:53 PM by kumin »

1rainman

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Re: F2 citrange winter hardiness trial
« Reply #454 on: August 28, 2022, 03:17:40 PM »
How do you cross breed citrus considering they usually pollinate themselves

mikkel

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Re: F2 citrange winter hardiness trial
« Reply #455 on: August 28, 2022, 03:53:57 PM »
There is a lot of information here. You can read a little in older posts.
Many citrus plants are nucellar and thus simple clones of the parent tree, but there are also many varieties that are zygotic. However, nucellar trees will also produce some zygotic offspring.
For nucellar varieties, it depends on the number of seedlings to find the zygotic offspring

kumin

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Re: F2 citrange winter hardiness trial
« Reply #456 on: August 28, 2022, 07:12:03 PM »
As Mikkel mentioned, hybridizing Citrus isn't necessarily as straightforward as most plants. Citrus can produce:

1. Nucellar embryos which develop into exact clones of the mother tree.

2. Zygotic embryos, containing genetic contributions from the seed parent, as well as the pollen donor parent, same as are normally found in the majority of plants.

3. Or commonly, a mixture of both types.

Citrus having exclusively nucellar embryos can serve as pollen parents. Citrus producing zygotic embryos can serve as either pollen, or seed parents. There are additional nuances such as pollen sterility (Satsuma), self incompatibility (Clementine tangor).

The actual breeding process involves removal (emasculation) of the pollen bearing anthers from the intended seed bearing flower before any pollen is shed(dehiscence). And protecting the flower from bee visitation, or accidental pollen introduction onto the receptive stigma.
 Pollen is collected from the intended pollen donor flower(s) free of contamination by extraneous pollen. This pollen is transferred onto the stigma of the emasculated seed flower. The stigma should produce a sticky film on it's surface when it's receptive to pollen. The pollinated flower is then identified and protected from additional unintended exposure to pollen until the stigma is no longer receptive.

Not ever breeder will follow ever step for the sake of saving time. Not every flower will produce a persisting fruit. Unpollinated flowers and  buds can be removed to increase fruit set among the control pollinated flowers. Removal of pre-existing fruit may also improve fruit set of the control pollinated flowers.

The center of the flower showing the miniature fruit (ovary) behind the style and the small round stigma. The pollen grains germinate on the stigma and the sperm cells grow through the pistil into the ovary. Fertilization occurs in the ovary. Encircling the ovary are a ring of filaments topped by anthers. In natural pollination the pollen is transferred from anthers onto the stigma.
In controlled pollination unintended pollen is excluded from contact with the stigma, while the desired pollen is placed on the stigma by human intervention.
« Last Edit: September 01, 2022, 04:32:33 AM by kumin »

kumin

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Re: F2 citrange winter hardiness trial
« Reply #457 on: September 27, 2022, 04:46:54 PM »
With the onset of Autumn just beginning, I've noticed the Conestoga A-026 Segentrange fruits starting to break color. Hopefully they'll progress to a solid orange color by the time of ripening. The fruit size is just a bit larger than Poncirus and the shape perhaps more globose, but Poncirus is already quite round. The rind is smooth.



Last year's fruit color on immature A-026fruits.









« Last Edit: September 28, 2022, 06:17:29 AM by kumin »

Ilya11

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Re: F2 citrange winter hardiness trial
« Reply #458 on: September 28, 2022, 03:42:44 AM »
Kumin,
Are fruits of poncirus already ripe in your region?
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                       Ilya

kumin

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Re: F2 citrange winter hardiness trial
« Reply #459 on: September 28, 2022, 05:33:51 AM »
Ilya, Poncirus is also showing rind color transition, but is about 2-3 weeks from full ripeness. Within the cold frame there's Poncirus+ which is showing less color change than the A-026. The Poncirus+ fruits are much smaller, perhaps due to low seed count. A-026 blooms and sets fruit freely, but last year's seeds produced all nucellar seedlings.
I'm very interested in seeing what the taste of the A-026 fruit is upon ripening. I recall the peel having a degree of Poncirus flavors. Of greater interest is the taste of the flesh.

There are several hundred grafted young trees planted outdoors to further evaluate their Winter hardiness. I plan on using both anti desiccants and diluted white interior latex paint spray in December. The white paint will only be applied on the South side of the trees.
« Last Edit: September 28, 2022, 06:14:42 AM by kumin »

Ilya11

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Re: F2 citrange winter hardiness trial
« Reply #460 on: September 28, 2022, 09:05:52 AM »
Thank you,
But when PT was flowering this spring?
My plants usually flower at the middle of April, now fruits are almost entirely yellow.
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                       Ilya

kumin

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Re: F2 citrange winter hardiness trial
« Reply #461 on: September 28, 2022, 09:41:25 AM »

Poncirus in full bloom on April 24th 2022.


Poncirus fruits today. They're in the process of changing color. We are getting cool nights, which accelerates the color change.
« Last Edit: September 28, 2022, 09:47:22 AM by kumin »

Ilya11

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Re: F2 citrange winter hardiness trial
« Reply #462 on: September 28, 2022, 11:11:18 AM »
It seems that A-026 was in a frame, was it flowering also in April?
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kumin

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Re: F2 citrange winter hardiness trial
« Reply #463 on: September 28, 2022, 12:21:57 PM »
It seems that A-026 was in a frame, was it flowering also in April?

Yes, Ilya, A-026 flowered a few days before outdoor Poncirus, but due to cool weather the blooming periods overlapped quite a bit. I suspect the warmer daytime temperatures in the cold frame hastened the blooming period by about 5-7 days.
The overlapping blooming periods allowed me to make a number of crosses.

 

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