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Citrus General Discussion / Clementine cold tolerance?
« on: August 28, 2024, 01:05:24 PM »
Out of curiosity, does anyone here have much experience with the cold tolerance of clementines?
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Cold Hardy Citrus / Poorman Orange/New Zealand Grapefruit
« on: February 08, 2024, 10:46:47 AM »
I've read that this particular citrus is common in NZ due to its low heat requirement compared to true grapefruits, itself being some kind of pomelo x either a mandarin, a sour orange, or a tangelo (gee, that narrows it down a bit...).
What I can't seem to find any information on is how cold tolerant this thing is. I found plenty of info on NZ Lemonade, a different citrus, but nothing about NZ Grapefruit. Anyone have an idea?
What I can't seem to find any information on is how cold tolerant this thing is. I found plenty of info on NZ Lemonade, a different citrus, but nothing about NZ Grapefruit. Anyone have an idea?
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Cold Hardy Citrus / Heterozygosity and zygotic breeding lines
« on: January 17, 2024, 10:47:38 AM »
While I am nowhere near up to speed on all the literature, most of what I have read indicates that, at least for polyembryony, which associates closely with nucellar seed and is a major practical hindrance for breeding, is controlled by a single dominant gene, with a variety of genetic and non genetic factors affecting the degree of polyembryony. What I am wondering is if most polyembryonic varieties are heterozygous, carrying a copy of the recessive allele for monoembryony and thus zygotic seedlings, or if the years of selecting zygotic seedlings from large populations of nucellar seedlings bred from two polyembryonic parents has lead to many if not most polyembryonic citrus to being homozygous for that darned gene.
Some are easy enough to know, since we have many varieties that are F1 children of pomelos, citrons, etc. But for other varieties, say satsumas or the various citromelos with grapefruit parentage, do we know if they tend to be heterozygous?
The practical side to all of this comes down to how many generations are needed and if any back crossing to the zygotic parent is required to eliminate polyembryonism.
Some are easy enough to know, since we have many varieties that are F1 children of pomelos, citrons, etc. But for other varieties, say satsumas or the various citromelos with grapefruit parentage, do we know if they tend to be heterozygous?
The practical side to all of this comes down to how many generations are needed and if any back crossing to the zygotic parent is required to eliminate polyembryonism.
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Cold Hardy Citrus / Table of citrus cold hardiness and %zygotic seed
« on: May 25, 2023, 04:56:15 PM »
Note: %zygotic and hardiness values are not absolute. Zygotic and nucellar seedlings are strongly influenced by the pollen donor and may be influenced by environmental variables as well. Hardiness is even more variable. Hardiness is affected by factors such as duration of the cold event, rootstock, humidity, windspeed, exposure, solar radiation, etc. Winter hardiness is also highly dependent on full dormancy and properly hardened off plant material. Periods of warmth preceding a freeze can drastically reduce cold hardiness, and less mature plant material is considerably more susceptible to damage. Lastly, the values below assume mature plants, juvenile or otherwise small plants are not as hardy. For climates, as a rule of thumb, plants the southeast USA are more prone to not being fully dormant, but freezes are generally short duration, often only a few hours, so the absolute lows that plants will survive may be several degrees colder than in other climates, whereas plants in the pacific northwest and in Europe are more likely to be properly dormant, but cold events generally last longer and night to day temperatures might not be much different. In both climates, plants can easily be killed by temperatures above their technical cold hardiness limit, in the southeast this is often due to plants not fully entering or having broken dormancy prior to a freeze, and in the PNW and Europe due to freezing temperatures lasting for extended periods of time (pretty much any edible citrus plants will be damaged or killed by four or five days continuously below 30 F, or by three weeks of sunny 70 F weather followed by a night of 30 F).
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Cold Hardy Citrus / US-1279 and SuperSour 2, new and better zygotic parents for cold hardy breeding?
« on: May 15, 2023, 11:20:45 AM »
Browsing the literature, it seems the industry has started moving away from highly nucellar rootstocks, which is great news to those of us with breeding aspirations. Most of the new HLB resistant rootstocks have very high rates of zygotic seedlings, at least according to citrusrootstocks.org and the papers I found for the newer USDA releases.
While I haven't found specific cold hardiness data, just looking at perigee, two of the new ones, US-1279, Changsha x poncirus, and SuperSour 2, poncirus x (c. aurantium x c. ichangensis) ought to be very cold hardy. US-1279 is listed as 100% zygotic. Supersour 2 has not been determined yet, but one of the stated goals of the SuperSour program is to breed highly zygotic rootstocks, so it's likely this release will be very good for breeding as well.
And since these are USDA released rootstock plants, they should already have great disease residence, including some HLB resistance, vigor, and productivity. Assuming the hardiness is as good as it ought to be given their parents, I'm thinking these two might make great alternatives to the other poncirus and poncirus x varieties that are currently out there.
While I haven't found specific cold hardiness data, just looking at perigee, two of the new ones, US-1279, Changsha x poncirus, and SuperSour 2, poncirus x (c. aurantium x c. ichangensis) ought to be very cold hardy. US-1279 is listed as 100% zygotic. Supersour 2 has not been determined yet, but one of the stated goals of the SuperSour program is to breed highly zygotic rootstocks, so it's likely this release will be very good for breeding as well.
And since these are USDA released rootstock plants, they should already have great disease residence, including some HLB resistance, vigor, and productivity. Assuming the hardiness is as good as it ought to be given their parents, I'm thinking these two might make great alternatives to the other poncirus and poncirus x varieties that are currently out there.
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Temperate Fruit Buy, Sell, & Trade / WTB Chilean guava cuttings
« on: May 13, 2023, 11:12:53 AM »
Looking to buy some cuttings of Ugni molinea, the Chilean guava or guavaberry. If possible, not the variegated selection.
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Tropical Fruit Discussion / Cashew fruit taste like sea buckthorn?
« on: April 26, 2023, 09:18:00 PM »
This will be a niche among niches, but here goes.
I had cashew fruit for the first time today. While I'm not a fan, it certainly tasted interesting. Took a while to work it out, but it was lightly tropical (vaguely passion fruit or lichee), with a kind of bruised to the point of mushy strawberry, and a weird funk that I guess is like the ends of a pineapple that's over ripe. The funk got stronger the more I had.
I couldn't really place it, or even describe it well. Then it hit me. Sea buckthorn???
It's been such a long time since I've had sea buckthorn though, so I'm not sure if my taste buds are hallucinating at this point. My question is, any of you guys and gals ever had both cashew fruit and sea buckthorn? Do they actually taste similar?
Alternatively, maybe I just had a bad one ("tastes like sea buckthorn" is not a complement to my mind...). For those who have had cashew fruit, is it good, or kinda funny in a not so nice way?
I had cashew fruit for the first time today. While I'm not a fan, it certainly tasted interesting. Took a while to work it out, but it was lightly tropical (vaguely passion fruit or lichee), with a kind of bruised to the point of mushy strawberry, and a weird funk that I guess is like the ends of a pineapple that's over ripe. The funk got stronger the more I had.
I couldn't really place it, or even describe it well. Then it hit me. Sea buckthorn???
It's been such a long time since I've had sea buckthorn though, so I'm not sure if my taste buds are hallucinating at this point. My question is, any of you guys and gals ever had both cashew fruit and sea buckthorn? Do they actually taste similar?
Alternatively, maybe I just had a bad one ("tastes like sea buckthorn" is not a complement to my mind...). For those who have had cashew fruit, is it good, or kinda funny in a not so nice way?
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