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

Paget, M. F.; Alspach, P. A.; Genet, R. A.; Apiolaza, Luis A.

doi:10.1007/s10681-014-1073-9

Cited by 7 publications

(6 citation statements)

References 38 publications

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“…In a previous study, a simple model was also found to be suitable for the evaluation of resistance to tuber powdery scab disease from 12 years of potato field trials (Paget et al. ). For MTY, there was only a small difference between the AIC of the factor analytic model of order 2 (FA2) and both the FA1 and CORH models.…”

Section: Discussionmentioning

confidence: 99%

Trial heterogeneity and variance models in the genetic evaluation of potato tuber yield

et al. 2015

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Genetic evaluation aims to identify genotypes with high empirical breeding values (EBVs) for selection as parents. In this study, 2157 potato genotypes were evaluated for tuber yield using 8 years of early‐stage trial data collected from a potato breeding programme. Using linear mixed models, spatial parameters to target greater control of localised spatial heterogeneity within trials were estimated and variance models to account for across‐trial genetic heterogeneity were tested. When spatial components improved model fit, correlations of errors were mostly small and negative for marketable tuber yield (MTY) and total tuber yield (TTY), suggesting the presence of interplot competition in some years. For the analysis of multi‐environment trials, a variance model with a simple correlation structure (with heterogeneous variances) was the most favourable variance structure fitted for TTY and PTY (per cent marketable yield). There was very little difference in model fit when comparing a factor analytic structure of order 2 (FA2) with either FA1 or simple correlation structures for MTY, indicating that simple variance models may be preferable for early‐stage genetic evaluation of potato yield.

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Section: Discussionmentioning

confidence: 99%

Trial heterogeneity and variance models in the genetic evaluation of potato tuber yield

et al. 2015

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“…This experiment used eight potato cultivars (Table ), chosen to represent the full spectrum of susceptibility to tuber powdery scab, determined in on‐going, multi‐year field evaluations (Falloon et al ., ; Genet et al ., ; Paget et al ., ). The experiment ran for 56 days, and was carried out in a greenhouse maintained at 16 ± 2°C, with supplementary lighting to give a diurnal cycle of 16 h light/8 h dark.…”

Section: Methodsmentioning

confidence: 97%

Root infection of potato by Spongospora subterranea: knowledge review and evidence for decreased plant productivity

et al. 2015

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Information is reviewed on root infection of potato by the plasmodiophorid Spongospora subterranea f. sp. subterranea. This pathogen has long been recognized as the cause of root galls (hyperplasia) and the economically important disease powdery scab on tubers (modified stolons). The significance for plant productivity of the zoosporangium stages of the pathogen in potato roots has only recently begun to be documented. Two experiments are described that assessed effects of S. subterranea root infection on potato plant root function and productivity. A greenhouse experiment measured root function and plant parameters for eight potato cultivars with markedly different susceptibilities to tuber powdery scab. Water uptake and plant growth were reduced by S. subterranea inoculation in all eight cultivars. The magnitudes of these negative effects, and intensities of root hyperplasia, differed among the cultivars, but were not related to respective susceptibilities to tuber powdery scab. A field trial assessed root function and plant productivity for a cultivar (Iwa) that is very susceptible to Spongospora tuber and root diseases. Soil water content beneath uninoculated plants was consistently less than for inoculated plants, indicating that inoculation reduced water uptake (root function). Inoculation reduced shoot and root dry weights, and reduced weight of tubers per plant by 42%. Spongospora subterranea causes three diseases of potato: root membrane dysfunction, root hyperplasia and tuber powdery scab. The root diseases caused by the pathogen are likely to be important both for powdery scab management and for deleterious effects on potato crop yields.

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“…In this regard, best linear unbiased prediction (BLUP) incorporates all records from all relatives and correlated traits to predict the additive and total genetic values of the genotypes for all traits, which enables optimal selection of genotypes and their deployment at any stage of testing in potato breeding (Kerr et al 2009). Moreover, genetic variance models within a mixed model framework were applied to powdery scab data from long-term potato breeding trials for the genetic assessment of breeding clones (Paget et al 2014). Models including pedigree gave a better fit to the data than models that did not include this relationship information.…”

Section: Genetic Resources and Breedingmentioning

confidence: 99%

Polyploidy and Plant Breeding

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2015

Plant Breeding in the Omics Era

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

Cited by 7 publications

References 38 publications

Trial heterogeneity and variance models in the genetic evaluation of potato tuber yield

Trial heterogeneity and variance models in the genetic evaluation of potato tuber yield

Root infection of potato by Spongospora subterranea: knowledge review and evidence for decreased plant productivity

Polyploidy and Plant Breeding

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