Book contents
- Frontmatter
- Contents
- List of contributors
- Preface
- Editors' note and acknowledgements
- Introduction
- The development of potato varieties in Europe
- Genetic Resources
- Breeding Strategies
- Selection and Screening Methods
- The efficiency of early generation selection
- Problems associated with early generation selection of potato clones in West Siberia
- Influence of weight of seed tubers on selection of first year clones: preliminary results
- A joint cyst nematode/late blight test for early generation screening of potato clones
- Screening for resistance to diseases in a potato breeding programme
- Breeding for resistance to potato viruses with special reference to cDNA probes
- Screening for resistance to diseases and pests
- Breeding for resistance to and tolerance of potato cyst nematode
- Breeding multi-resistant potato germplasm
- Resistance to storage diseases in breeding stocks
- Phytophthora research at the Foundation for Agricultural Plant Breeding (SVP)/ The Netherlands
- Effect of time interval between inoculation and assessment on relative content of potato virus YN in leaves of potato plants
- Selection and evaluation of potatoes for improved tolerance of environmental stresses
- Variety Assessment
- Semi-conventional Breeding Methods
- True Potato Seed
- Unconventional Breeding Methods
- Commentary
- Index
Screening for resistance to diseases and pests
Published online by Cambridge University Press: 05 March 2012
- Frontmatter
- Contents
- List of contributors
- Preface
- Editors' note and acknowledgements
- Introduction
- The development of potato varieties in Europe
- Genetic Resources
- Breeding Strategies
- Selection and Screening Methods
- The efficiency of early generation selection
- Problems associated with early generation selection of potato clones in West Siberia
- Influence of weight of seed tubers on selection of first year clones: preliminary results
- A joint cyst nematode/late blight test for early generation screening of potato clones
- Screening for resistance to diseases in a potato breeding programme
- Breeding for resistance to potato viruses with special reference to cDNA probes
- Screening for resistance to diseases and pests
- Breeding for resistance to and tolerance of potato cyst nematode
- Breeding multi-resistant potato germplasm
- Resistance to storage diseases in breeding stocks
- Phytophthora research at the Foundation for Agricultural Plant Breeding (SVP)/ The Netherlands
- Effect of time interval between inoculation and assessment on relative content of potato virus YN in leaves of potato plants
- Selection and evaluation of potatoes for improved tolerance of environmental stresses
- Variety Assessment
- Semi-conventional Breeding Methods
- True Potato Seed
- Unconventional Breeding Methods
- Commentary
- Index
Summary
In potato breeding programmes much of the testing for disease and pest resistance consists of laboratory or field trials of clonal material, which are costly of time and effort. The selection pressure that has therefore been imposed for these characters has been weak. The Scottish Crop Research Institute (SCRI) has been investigating ways of increasing the efficiency of selection by identifying parental clones which pass on their resistance with an high probability.
Several economically important resistance traits are governed by single dominant effective factors inherited in a disomic manner, e.g. H1 gene conferring resistance to Globodera rostochiensis (Rol); Rx genes giving immunity to potato virus X (and B) and Ry genes providing extreme resistance to potato virus Y. Selective breeding combined with test crossing of resistant clones with susceptibles and assessing the progenies can produce parental material with increased “copies” of such genes. Clones which have a single copy of the gene (simplex) are intercrossed and by test crosses with susceptibles, duplex clones are identified amongst their progeny (Figure 1). The duplex clones are then intercrossed or selfed and the resulting clones again crossed to susceptibles to identify those with three or four copies (triplex or quadruplex) of the gene (Dale & Mackay 1982; Solomon & Mackay person, comm.).
The number of clones that need to be tested to distinguish between the various ratios is readily calculated (Mather 1938).
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- The Production of New Potato VarietiesTechnological Advances, pp. 88 - 90Publisher: Cambridge University PressPrint publication year: 1987
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