Post by marches on Oct 3, 2014 10:47:38 GMT -8
Tom Wagner Avatar
Sept 28, 2014 19:25:19 GMT 1 Tom Wagner said:
I have been at this late blight thing for so long with tomatoes and potatoes, you would think there would be a commercial interest. Sadly, no.
Maybe if the readership on this forum keep at it ....maybe some outside interest will show up.
Getting interest among gardeners is probably the best way to go about it if the seed companies aren't interested.
To associate me with practical strategic planning as regards to breeding for Late Blight resistance is laughable.
I am neither practical nor strategic in my planning as it were. I plunder along with the idea that there is safety in numbers much to the bane of my cooperators. Innately, I use the template of probability and statistics to screen my materials for whatever value I attribute to the potato clones. Late Blight imposes on me to the point that I have to live with it or cease breeding potatoes. The literature is rampant with valuable and sometimes obsolete references to potato clones with purported blight tolerance, etc. I try to maintain a number of internationally recognized clones that fair quite well in their country of origin and also perform well here against LB. There is an attrition of those clones of those clones if they fail to respond well to LB and or if they succumb to virus buildup making them useless for breeding.
I replace clones quite often due to virus and access new or old tried clones from tissue culture or small tuber samples of virus free potatoes.
There is something about saving the best ten percent of of previously grown name varieties and adding one hundred clean clones to the mix. If the potatoes are planted in soil that has lots of volunteer potatoes and lots of tomatoes planted nearby in areas known to blight up regularly, one can see the flowers succumb to blight and fail to set fruit. If the blight hits early enough that eliminates them from further breeding and or setting OP berries. Having lots of TPS seedlings in the area that have parental histories of blight resistance allows one to mix them up in the breeding and the healthy seedlings and tuber lines are then available for pollen collection, flower pollination, and natural sources for wind/insect transferred crossing.
I suspect one should start with a thousand TPS seedlings in order to reduce them down to the best one hundred combining LB resistance with agronomic traits desired. Replanting those tubers the next spring are often reduced due to storage features, flavor, or berry setting ability. I tend to favor berry setting as a necessary requisite to adding to my favorite 100 clones to use in a LB breeding block. I need selfers as much as I need natural crossers and hybrids I make myself. Doubling up whatever alleles in a vertical and horizontal resistance package is extremely important.
I phase out clones sometimes at the rate of 99% or more. I can't maintain as many as I would like. I place much importance to new seedlings. If a new seedling tuber gets planted out the next season that may be the last time...as I rarely maintain a tuber line from established international clones or from my own creations very long. I often go back to TPS of five to ten years ago to build up that genetic stock in order to keep the breeding work fluid. I don't rely on just current year tolerance of blight to dictate my screening. By having lines that trace back to specific years for tolerance and retrying them in a mix of clones for breeding I think I keep the diversity vibrant for my purposes.
Providing TPS to my customers with lots of variation coupled with LB resistance, I hope it keeps the interest alive. Accidental successes are as important as planned successes. As incompetent as I think I am, likewise many in the professional potato world think too....my limited success is nevertheless valuable to someone.
Can't clones be "cleaned" of viruses by starting new plants from sprouts? I thought I read that on here somewhere. With grape vines they are heat treated or irradiated or something, I forget...
Sarpo Mira X Accord would be the most interesting. I'll let you figure out why.
Because one is early and the other is late?Few berries on Accord? Then switch Accord to be the pollen parent (do that with seedless grapes - the seedless variety has to be the 'father' for obvious reasons). I have no idea really... With grapes we save pollen and even send it in the post to other breeders though and it stays viable for a while.
When I had Accord at my parent's place I wasn't impressed, but when I cooked and stored them it grew on me.
Sept 28, 2014 19:25:19 GMT 1 Tom Wagner said:
I have been at this late blight thing for so long with tomatoes and potatoes, you would think there would be a commercial interest. Sadly, no.
Maybe if the readership on this forum keep at it ....maybe some outside interest will show up.
Getting interest among gardeners is probably the best way to go about it if the seed companies aren't interested.
To associate me with practical strategic planning as regards to breeding for Late Blight resistance is laughable.
I am neither practical nor strategic in my planning as it were. I plunder along with the idea that there is safety in numbers much to the bane of my cooperators. Innately, I use the template of probability and statistics to screen my materials for whatever value I attribute to the potato clones. Late Blight imposes on me to the point that I have to live with it or cease breeding potatoes. The literature is rampant with valuable and sometimes obsolete references to potato clones with purported blight tolerance, etc. I try to maintain a number of internationally recognized clones that fair quite well in their country of origin and also perform well here against LB. There is an attrition of those clones of those clones if they fail to respond well to LB and or if they succumb to virus buildup making them useless for breeding.
I replace clones quite often due to virus and access new or old tried clones from tissue culture or small tuber samples of virus free potatoes.
There is something about saving the best ten percent of of previously grown name varieties and adding one hundred clean clones to the mix. If the potatoes are planted in soil that has lots of volunteer potatoes and lots of tomatoes planted nearby in areas known to blight up regularly, one can see the flowers succumb to blight and fail to set fruit. If the blight hits early enough that eliminates them from further breeding and or setting OP berries. Having lots of TPS seedlings in the area that have parental histories of blight resistance allows one to mix them up in the breeding and the healthy seedlings and tuber lines are then available for pollen collection, flower pollination, and natural sources for wind/insect transferred crossing.
I suspect one should start with a thousand TPS seedlings in order to reduce them down to the best one hundred combining LB resistance with agronomic traits desired. Replanting those tubers the next spring are often reduced due to storage features, flavor, or berry setting ability. I tend to favor berry setting as a necessary requisite to adding to my favorite 100 clones to use in a LB breeding block. I need selfers as much as I need natural crossers and hybrids I make myself. Doubling up whatever alleles in a vertical and horizontal resistance package is extremely important.
I phase out clones sometimes at the rate of 99% or more. I can't maintain as many as I would like. I place much importance to new seedlings. If a new seedling tuber gets planted out the next season that may be the last time...as I rarely maintain a tuber line from established international clones or from my own creations very long. I often go back to TPS of five to ten years ago to build up that genetic stock in order to keep the breeding work fluid. I don't rely on just current year tolerance of blight to dictate my screening. By having lines that trace back to specific years for tolerance and retrying them in a mix of clones for breeding I think I keep the diversity vibrant for my purposes.
Providing TPS to my customers with lots of variation coupled with LB resistance, I hope it keeps the interest alive. Accidental successes are as important as planned successes. As incompetent as I think I am, likewise many in the professional potato world think too....my limited success is nevertheless valuable to someone.
Can't clones be "cleaned" of viruses by starting new plants from sprouts? I thought I read that on here somewhere. With grape vines they are heat treated or irradiated or something, I forget...
Sarpo Mira X Accord would be the most interesting. I'll let you figure out why.
Because one is early and the other is late?Few berries on Accord? Then switch Accord to be the pollen parent (do that with seedless grapes - the seedless variety has to be the 'father' for obvious reasons). I have no idea really... With grapes we save pollen and even send it in the post to other breeders though and it stays viable for a while.
When I had Accord at my parent's place I wasn't impressed, but when I cooked and stored them it grew on me.