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#166 | |
Tomatovillian™
Join Date: Mar 2015
Location: Zone 5A, Poconos
Posts: 959
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Fred, you are confusing the heck out me! Which is it?
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#167 |
Tomatovillian™
Join Date: Jul 2014
Location: Central Florida
Posts: 620
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The thought has often come to my mind, when considering buying an F1 from a vendor of 1 person, 3rd party vendors online or a vendor from China, am I really getting an F1 or a F1 that has been dehybridized.
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#168 |
Tomatovillian™
Join Date: Dec 2010
Location: Sunol, CA
Posts: 2,723
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I think it is a common "error" by seed RE-SELLERS. For example, I occasionally find companies who have clearly purchased bulk seed calling my OP varieties hybrids.
I do not think it is a common practice by seed companies who are offering varieties that THEY THEMSELVES HAVE BRED. Sorry for the confusion. |
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#169 | |
Tomatovillian™
Join Date: Dec 2010
Location: Sunol, CA
Posts: 2,723
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Disease resistance is very tricky, because there are cases where being homozygous for a resistance gene will result in a "cost" (less vigor, etc.). However, there must also be cases where homozygous is better. That said, disease resistance stacking at many loci is probably both very difficult to achieve, and will lead to vigor costs. And it is important to note that vigor is also one general way to "fight" disease, so reducing vigor reduces general disease resistance.
One reason I think I generally see better "general" disease resistance in hybrids is because my experience tells me very clearly that plant vigor is generally enhanced in hybrids -- probably due to the genetic diversity increase in hybrids (because the two parents will have alternate forms of genes at many loci, and thus more genes and more "solutions" to problems) I do find that OPs have better resistance in earlier generations, when they are still genetically more diverse. I have had countless examples where OPs I am developing get "weaker" over time. My general selections are based on taste, but I still always try to also select for vigor when I have a number of plants in a population with equivalent taste. I do not choose parents specifically to be more productive, and I don't follow disease markers or "vigor" markers. I do try to start with parents that are generally decent with regards to vigor and disease resistance. And my parental lines clearly do have some genes that have been specifically put there by other breeders. I just don't follow them molecularly. But, I assume that I select for them in the field. Quote:
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#170 |
Tomatovillian™
Join Date: Dec 2010
Location: Sunol, CA
Posts: 2,723
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I think when it comes to hybrids, it is best to go with companies that are "professional". And that includes vendors like TGS, Johnny's and High Mowing (small companies).
While it is true that a 1 person mom-and-pop seed companies may be selling legit hybrid seed, I think your risk goes up when purchasing, particularly on Etsy or Ebay. That said, I have a seed business that is by most all measures mom-and-pop, but I do sell legit hybrid seed. So, there are exceptions to every rule. |
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#171 | |
Tomatovillian™
Join Date: Jan 2012
Location: Zone 8a
Posts: 120
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You won't find much on Google because the nursery (Bonnie Plants) made up the name. Porter is an old Texas seedsman from the Great Depression era and he and his company never marketed a "Porters Dark Cherry" that started this. ![]() |
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#172 | |
Tomatovillian™
Join Date: Mar 2015
Location: Zone 5A, Poconos
Posts: 959
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#173 | |
Tomatovillian™
Join Date: Jul 2014
Location: Central Florida
Posts: 620
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Larry |
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#174 | |
Tomatovillian™
Join Date: Feb 2013
Location: Gloucester, Virginia
Posts: 90
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I suppose it would be an interesting experiment to see if the later generations which appear to lose some of their disease resistance when grown by you locally, gain it back if grown in other parts of the county/state/country/world |
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#175 | |
Tomatovillian™
Join Date: Dec 2010
Location: Sunol, CA
Posts: 2,723
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I think you are right that changes in field conditions do partially explain the "reduced resistance over time" that we sometimes see.
There may be cases where pathogens evolve in a field after successive years of tomato growing (even if you are practicing crop rotation). But this is hard to separate from the effects of simple buildup of diseases that can occur in a field over time if tomatoes are consistently grown. Either way, the increasing genetic uniformity that comes with the selection of an OP variety is not the sole reason one might see poorer vigor and/or disease resistance over time. Quote:
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#176 | |
Tomatovillian™
Join Date: Jul 2014
Location: Central Florida
Posts: 620
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Does this mean that my old school attempts to improve the productivity of an OP variety in my harsh growing conditions is of little, if any, value? I continue to choose the largest tomato from the best vine to save seeds from. This has seemed to work well for me on at least one variety. This fall season it produced its largest tomato yet after growing for approximately 7 seasons, also its productivity is very good. Thanks, Larry |
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#177 |
Tomatovillian™
Join Date: Jan 2012
Location: Zone 8a
Posts: 120
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I select based on plant total production and usually toward the end of the season. It's not always the largest fruit I choose but not the runt either.
Each year I test new OP varities to see which work best for me and they are always compared to the better hybrids for production. Not that close yet except for cherry tomatoes but I guess that is why the hybrid seed business can continue over a 100 years. Last edited by OldHondaNut; December 12, 2018 at 12:33 AM. |
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#178 | |
Tomatovillian™
Join Date: Dec 2010
Location: Sunol, CA
Posts: 2,723
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I think continued careful selection of OP varieties to improve them is well worth it!
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#179 | |
Tomatovillian™
Join Date: Nov 2008
Location: Minnesota
Posts: 568
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All the fruit on a plant has the same genotype, so there is no possible benefit from saving seed from the largest vs smallest fruit on an individual plant. |
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#180 |
Tomatovillian™
Join Date: Dec 2017
Location: Metro Denver
Posts: 767
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So if all the fruits on one plant have the same genotype-which are the best to select for seeds? Earlier, later, largest,very ripe?
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