Post by Tom Wagner on Jun 12, 2010 18:33:50 GMT -8
Funny or not, the Schmeiser connection to Mosanto and my wish not to be compromised by GMO invasions into my germ plasm collections is enough to illustrate the ludicrousness of all things GMO.
Thanks Patrick and Rebsie for your insights over at the patnsteph blog and for your vote of confidence in my work with potato breeding.
I am going to add a rather long-winded addition here...
The literature shows a relatively uniform high level of resistance to P. infestans in S. bulbocastanum, S. pinnatisectum, S. cardiophyllum, and S. circaetfolium. I don't know which are used by Sainbury.
In the past...QuoteUnquote.
resources.metapress.com/pdf-preview.axd?code=j451x6t15u254102&size=largest
This link shows where some of the R genes came from; namely S demissum and this report is from 1966 well before the GMO era. And the report links to work done 50 years prior indicating a hundred year breeding cycle of tuberosum and demissum.
edepot.wur.nl/121660 lots of reading here
QuoteUnquote.
ABPT material is heavily used in my breeding and pre-GMO bulbocastanum will be increasingly used. I had Helgeson's material years ago and I will talk more about his clones later someday.
I seek forms of resistance that are effective against a broad range of pathogenic strains of Phytophthora infestans.
Polygenic, additive resistance is the most promising even if it working with a large number of depleted genes. This resistance can be made possible by multiple monogenic, race-specific major (R) gene-mediated resistance with the latest Blue 13 resistant genes in such clones as Sarpo Mira.
Twelve depleted, or residual R genes for resistance to LB have been identified within the Late Blight Differential potato clones that I have. These R genes originated in Mexican wild S. demissum, The Mexican wild potato S. verrucosum may possess high levels of quantitative resistance besides R gene-mediated resistance.
Therefore, it wiil be desirable to test every potential source or past source of resistance for the occurrence of race-specific resistance genes, and it is possible to have a large population of true seed that one can add additional R genes not yet identified. So each year, with the breeding lines recombined in crosses with the best survivors, I can test the populations for the occurrence and segregation of race-specific R genes in many permutations. The priority is not to rely on a single clone, but a mixture of clones that each year is renewed as new seedlings. Individual hills could be cloned, increased, and spread about, but the core breeding population should be kept in flux; intermating the most resistant clones with bulk pollen from all representations in the population.
Thanks Patrick and Rebsie for your insights over at the patnsteph blog and for your vote of confidence in my work with potato breeding.
I am going to add a rather long-winded addition here...
The literature shows a relatively uniform high level of resistance to P. infestans in S. bulbocastanum, S. pinnatisectum, S. cardiophyllum, and S. circaetfolium. I don't know which are used by Sainbury.
In the past...Quote
"A number of wild potato species, such as Solanum demissum (2n = 6x = 72), co-evolved with P. infestans, and have provided the primary germplasm for breeding former late blight resistance in cultivated potato. At least 11 resistance (R) genes that originated from S. demissum have been incorporated into various potato cultivars. All of these 11 R genes confer race-specific hypersensitive resistance. Potato cultivars possessing such R genes are not resistant to all races of the pathogen. These race-specific R genes provide only short-lived resistance in the field as new virulent races of the pathogen rapidly overcome the resistance encoded by single race-specific resistance genes."
resources.metapress.com/pdf-preview.axd?code=j451x6t15u254102&size=largest
This link shows where some of the R genes came from; namely S demissum and this report is from 1966 well before the GMO era. And the report links to work done 50 years prior indicating a hundred year breeding cycle of tuberosum and demissum.
edepot.wur.nl/121660 lots of reading here
Quote
"Introduction of S. bulbocastanum-derived resistance has been achieved through interspecific bridge crosses between S. bulbocastanum, S. acaule, S. phureja and S. tuberosum (Hermsen and Ramanna, 1973), resulting in so-called ABPT material which is widely used for potato late blight breeding. Additionally, Helgeson et al. (1998) generated somatic hybrids between S. bulbocastanum and cultivated potato. The somatic hybrids led to fertile plants that retained the resistance and could be used for breeding."
ABPT material is heavily used in my breeding and pre-GMO bulbocastanum will be increasingly used. I had Helgeson's material years ago and I will talk more about his clones later someday.
I seek forms of resistance that are effective against a broad range of pathogenic strains of Phytophthora infestans.
Polygenic, additive resistance is the most promising even if it working with a large number of depleted genes. This resistance can be made possible by multiple monogenic, race-specific major (R) gene-mediated resistance with the latest Blue 13 resistant genes in such clones as Sarpo Mira.
Twelve depleted, or residual R genes for resistance to LB have been identified within the Late Blight Differential potato clones that I have. These R genes originated in Mexican wild S. demissum, The Mexican wild potato S. verrucosum may possess high levels of quantitative resistance besides R gene-mediated resistance.
Therefore, it wiil be desirable to test every potential source or past source of resistance for the occurrence of race-specific resistance genes, and it is possible to have a large population of true seed that one can add additional R genes not yet identified. So each year, with the breeding lines recombined in crosses with the best survivors, I can test the populations for the occurrence and segregation of race-specific R genes in many permutations. The priority is not to rely on a single clone, but a mixture of clones that each year is renewed as new seedlings. Individual hills could be cloned, increased, and spread about, but the core breeding population should be kept in flux; intermating the most resistant clones with bulk pollen from all representations in the population.
