NDLI: Genetic variance models for the evaluation of resistance to powdery scab (Spongospora subterranea f. sp. subterranea) from long-term potato breeding trials

Content Provider	Springer Nature Link
Author	Paget, M. F. Alspach, P. A. Genet, R. A. Apiolaza, L. A.
Copyright Year	2014
Abstract	Breeding for resistance to soil-borne powdery scab in potato is an important component of the integrated management of this disease. Different genetic variance models within a mixed model framework were applied to data from long-term potato breeding trials, for the genetic evaluation of breeding lines. The multi-environment trial (MET) data came from 12 growing seasons (“years”, synonymous with environments) of New Zealand field trials screening for resistance to powdery scab on potato tubers. Pedigree information on a total of 1,031 genotypes was available. Additive components of the genetic effects were important with narrow-sense heritability estimates (and 95 % confidence intervals) from single-year analyses ranging from 0.26 (0.20, 0.44) to 0.57 (0.53, 0.85). Spatial components estimated from the residual plot effects were not important for most years and even when they were significant, estimates were small. In MET analyses, different variance structures for the genetic effects were tested; a homogeneous correlation model (CORH) gave a better fit to the data than a factor analytic FAk model of order (k), 1 and 2. The year-to-year genetic correlation estimate from CORH was 0.81 and compared with a range of 0.59–0.95 estimated from the FA1 model. There was no strong evidence of non-additive genetic effects with zero or boundary estimates for most years. Models which included the pedigree provided a better fit to the data than models that did not include this relationship information. There was no evidence for genetic improvement in resistance for powdery scab on tubers in the breeding population studied. This suggests that selection pressure for resistance in the past has been weak and greater consideration should be given to selecting parents on empirical breeding values to genetically improve breeding populations for resistance to powdery scab.
Starting Page	369
Ending Page	385
Page Count	17
File Format	PDF
ISSN	00142336
Journal	Euphytica
Volume Number	197
Issue Number	3
e-ISSN	15735060
Language	English
Publisher	Springer Netherlands
Publisher Date	2014-03-13
Publisher Place	Dordrecht
Access Restriction	One Nation One Subscription (ONOS)
Subject Keyword	Empirical breeding values Genetic parameters Potato breeding programme Multi-environment trials MET Variance components Plant Sciences Plant Genetics & Genomics Plant Pathology Plant Physiology Biotechnology
Content Type	Text
Resource Type	Article
Subject	Genetics Plant Science Horticulture Agronomy and Crop Science

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A Greenhouse Assay for Powdery Scab (Spongospora subterranea f. sp. subterranea) Resistance in Potato

Hairy Nightshade is an Alternative Host of Spongospora subterranea, the Potato Powdery Scab Pathogen

Effects of Different Soil Treatments on the Development of Spongospora subterranea f. sp. subterranea in Potato Roots and Tubers in the Greenhouse

Spongospora subterranea soil contamination and its relationship to severity of powdery scab on potatoes

Characterization of Spongospora subterranea f. sp. subterranea, the Cause of Powdery Scab of Potato in Pakistan

EVALUACIÓN DE Trichoderma asperellum COMO BIORREGULADOR DE Spongospora subterranea f. sp. subterranea EVALUATION OF Trichoderma asperellum AS BIOREGULATOR OF Spongospora subterranea f. sp. subterranea

Development of a Greenhouse Assay to Evaluate Potato Germplasm for Susceptibility to Powdery Scab

Relationship betweenSpongospora subterraneaf. sp. subterraneasoil inoculum level, host resistance and powdery scab on potato tubers in the field

Towards biological control of Spongospora subterranea f. sp. subterranea, the causal agent of powdery scab in potato

Genetic variance models for the evaluation of resistance to powdery scab (Spongospora subterranea f. sp. subterranea) from long-term potato breeding trials

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