Forum area for discussing hybridizing tomatoes in technical terms and information pertinent to trait/variety specific long-term (1+ years) growout projects.
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#1 |
Tomatovillian™
Join Date: Sep 2015
Location: Portugal
Posts: 4
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A few questions for the more experienced breeders: if you want to increase the speed of your breeding programme, can you do a cultivation in summer outside and winter in heated greenhouse? and thus capture 2 seasons in a year?
The thing I am most interested in is whether selection in the greenhouse will have undesired side effects: such as unintentionally selecting for different temperature tolerance. I know from the Netherlands that they do winter cultivation with lights and heat and it never reaches the quality of the summer crop, but does it influence selection significantly? I am located at latitude 39,9248, which might have an influence on winter sun hours. Does anyone here do winter cultivations in a greenhouse for their breeding? |
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#2 |
Tomatovillian™
Join Date: Dec 2010
Location: Pewaukee, Wisconsin
Posts: 3,148
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AKMark is in Alaska and breeds his own tomatoes. He grows most of his tomatoes in a greenhouse and also has some outdoors. Why not check with him if he does not find this thread on his own.
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~ Patti ~ |
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#3 |
Tomatovillian™
Join Date: Jun 2011
Location: Idaho
Posts: 241
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How big a greenhouse do you have? How many seg's are you thinking of growing?
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#4 |
Tomatovillian™
Join Date: Jun 2013
Location: Wasilla Alaska
Posts: 2,010
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I can easily do two generations per year, and three if I send seed to someone who can grow in the winter. We do look for traits such as cold tolerance, production, and early fruit set. The beauty of a GH is we can tailor the environment, I have never got accidental cross pollination either.
I am so done by October I would never do any winter crops, too cold to heat our GH's up here, other places further south I would do it. Piece of cake. |
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#5 |
Tomatovillian™
Join Date: Nov 2008
Location: Minnesota
Posts: 568
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if you have access to a greenhouse, two generations/yr is easy, three is possible. If you are advancing generations on early filial generations (i.e. F2-F4), you will need to be careful to advance multiple progeny per generation to manage "genetic drift", unless you are prepared to accept that risk, such as with a single seed decent strategy. When I employ a 2/3 generation/yr strategy to fine tune F5-F7 lines, I normally go with just a couple of progeny per line, and confirm uniformity. There is still some risk, but I believe it is properly balanced with the goal of "fixing"/stabilizing the inbred genotype.
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#6 |
Tomatovillian™
Join Date: Aug 2016
Location: Portland, OR
Posts: 19
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Hi, can you explain the concept of genetic drift a bit more? Not sure I'm following the risk...
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#7 |
Tomatovillian™
Join Date: Nov 2008
Location: Minnesota
Posts: 568
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Genetic drift is the inadvertent loss of genetic variation due to small sample size. For example in a F2 generation derived from a F1 of dis-similar parents - there will be abundant genetic variation among F2 family members, each carrying a different combination of traits from the F1 parents. If you can only grow out 2-3 F2 individuals, you have a very small sample of the potential gene/trait combinations available - and have a high risk of not capturing the ideal combination you are looking for.
Last edited by frogsleap farm; April 30, 2017 at 01:49 PM. Reason: typo |
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#8 |
Tomatovillian™
Join Date: Aug 2016
Location: Portland, OR
Posts: 19
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Interesting - thanks for the explanation!
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#9 | |
Tomatovillian™
Join Date: May 2013
Location: Honey Brook, PA Zone 6b
Posts: 399
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#10 | ||
Tomatovillian™
Join Date: Jun 2012
Location: Minnesota
Posts: 586
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Quote:
Next year I'll probably be selecting and growing micro-sized tomato plants in my basement too.
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http://the-biologist-is-in.blogspot.com Last edited by Darren Abbey; March 30, 2017 at 01:26 AM. |
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#11 | |
Tomatovillian™
Join Date: Sep 2015
Location: Portugal
Posts: 4
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Thanks to all others for the very informative replies, we are simply going to give it a try ![]() |
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#12 |
Tomatovillian™
Join Date: Jan 2014
Location: Near Philadelphia, PA
Posts: 1,940
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Let us know how it goes for you! Good luck!
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#13 |
Tomatovillian™
Join Date: Oct 2012
Location: Vancouver Island
Posts: 5,931
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Thank you very much, I was hoping that would be the case, I thought it might be.
KarenO |
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