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i got some free seeds from t&m dont know the variety watch this space for cropping and plant health
Quote from: amphibian on April 16, 2015, 15:59:33Crimson Crush does not have f1 in its name but according to the symbol at top right Suttons are claiming it is an F1 in some places.That's confusing, when I emailed them they wrote back to say they were not an F1 variety.
Crimson Crush does not have f1 in its name but according to the symbol at top right Suttons are claiming it is an F1 in some places.
Quote from: johhnyco15 on April 16, 2015, 18:52:27i got some free seeds from t&m dont know the variety watch this space for cropping and plant healthI have some too, must get them in. As the toms and tatties get blighted most years here, should be a decent test for them! Adrian
ive put all 5 seeds in and shall plant them along side my fandango to see the difference
Quote from: johhnyco15 on April 17, 2015, 17:50:12I've put all 5 seeds in and shall plant them along side my fandango to see the differenceA nice little trial, I wonder if they will let you know the variety later on?
I've put all 5 seeds in and shall plant them along side my fandango to see the difference
Of course it'll grow from self-saved seed. If it's an F1, the result will be variable, but you just pick out the best and save seed from those. It's easy to test for blight resistance; expose them to the disease and see what happens. I'm guessing, but commercial resistance is usually 'vertical resistance' based on a single gene. That makes it easy to select for once you have the gene, but it's probably going to be homozygous - with two copies of the gene - in which case you can't lose it. The weakness is that with vertical resistance the disease is one mutation away from becoming immune to whatever the plant's doing.
Of course it'll grow from self-saved seed.
There is no reason to assume homozygousity if an F1 because both Ph2 & Ph3 are codominant so if each parent carried just one then the F1 would be dual resistant but heterozygous for both genes. In the F2 only 1:16 plants would be homozygous for dual resistance and 1:16 no resistance with the remaining 14:16 having partial or heterozygous resistance. In any given season it may be very hard to separate the plants with partial from full resistance depending on blight varieties in a given year.I suspect this is why we have hithertonow seen no dual resistant homozygous varities.
Quote from: amphibian on April 18, 2015, 17:05:27There is no reason to assume homozygousity if an F1 because both Ph2 & Ph3 are codominant so if each parent carried just one then the F1 would be dual resistant but heterozygous for both genes. In the F2 only 1:16 plants would be homozygous for dual resistance and 1:16 no resistance with the remaining 14:16 having partial or heterozygous resistance. In any given season it may be very hard to separate the plants with partial from full resistance depending on blight varieties in a given year.I suspect this is why we have hithertonow seen no dual resistant homozygous varities.I'm not sure you mean "codominant" here. Codominance (or incomplete dominance) is a relationship between two alleles of the same gene which don't show the typical Mendelian one-or-the-other dominance pattern. The heterozygote shows a different phenotype to the homozygotes, often some kind of intermediate (e.g. a red flower crossed with a white flower showing all pink heterozygous F1s).Alleles of different genes can't be codominant. Maybe you're thinking of complimentary genes?I know very little about tomato genes, but it strikes me that it would be relatively easy to get a dual-resistant homozygote from an initial cross of parents with two different resistance genes given enough time and growing enough seeds, simply because tomatoes are self-pollinating.Homozygotes continue to breed homozygotes, but heterozygotes breed half heterozygotes and half homozygotes. Each generation you'll get fewer and fewer heterozygotes as they segregate. Completely non-resistant plants can be culled. And some of the resistant homozygotes will very likely be double resistant. The only drawback is it takes at least 7 generations to let genetics do all the work for you like this, possibly more. But there's no real work other than the initial cross and growing out plants every year.
How balmy is that! The answer I had was "The Tomato Crimson Crush is not an F1 variety." Perhaps we should ask Suttons again and make it best out of 3!