A Test of Taxonomic and Biogeographic Predictivity: Resistance to Soft Rot in Wild Relatives of Cultivated Potato

Chung, Yong Suk; Holmquist, Karsten; Spooner, David M.; Jansky, Shelley

doi:10.1094/phyto-05-10-0139

Cited by 31 publications

(14 citation statements)

References 31 publications

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“…Examples of those showing associations are cacao (Theobroma cacao L.; Whitkus et al, 1998), breadfruit [Artocarpus altilis (Parkinson) Fosberg; Zerega et al, 2004], wild potato species (Solanum verrucosum Schltdl. For example, studies analyzing multiple species of cultivated and wild relatives of potato have investigated the relationship between disease and pest resistance with geography and taxonomy and have failed to find associations ( Jansky et al, 2006( Jansky et al, , 2008Spooner et al, 2009;Cai et al, 2011;Chung et al, 2011;Khiutti et al, 2012;Uribe et al, 2013;Limantseva et al, 2014;Pérez et al, 2014). However, a number of studies show no relationship between geographic origin and traits of interest.…”

Section: Comparison Of Representative and Custom Methods Of Generatinmentioning

confidence: 99%

Comparison of Representative and Custom Methods of Generating Core Subsets of a Carrot Germplasm Collection

et al. 2019

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Crop breeding programs are interested in using genetic resources but have difficulty identifying useful accessions from germplasm collections. To efficiently use the diversity present in large germplasm collections, breeders often identify a subset of accessions that represent the larger collection. Methods to identify these subsets, which are called core collections, do not consistently capture functional diversity, and breeders would benefit from methods that help create custom core collections using existing data from variety trials or breeding programs. Making use of high‐density genomic data and existing phenotypic data from a collection of 433 domesticated carrot (Daucus carota L.) accessions, we tested whether it is possible to develop custom subsets of accessions for specific breeding purposes. We found that for this collection, representative strategies were effective in developing core collections that capture the diversity of the collection, but they were no better than random sampling, likely because the collection itself is not strongly subdivided. Custom strategies generated subsets that differed from the total collection with altered genetic, geographic, and phenotypic compositions. When used as training populations for genomic prediction of the other accessions in the collection, however, these custom cores did not produce a substantial improvement over traditional core collections. Increasing the size of the core did improve prediction accuracy, suggesting that it is possible to improve the usefulness of core collections by identifying custom subsets that are large enough to represent the functional genetic diversity present in the collection.

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Section: Comparison Of Representative and Custom Methods Of Generatinmentioning

confidence: 99%

Comparison of Representative and Custom Methods of Generating Core Subsets of a Carrot Germplasm Collection

et al. 2019

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“…The variation in the expression of disease resistance is likely the result of complex interactions between the plant, pathogen and environment that influence disease severity (Chung et al, 2011). Among potatoes, the genotypes CS 90-164-13 and E 2121 (Vitale et al, 2004) have been determined as the most resistant, which should correspond to MR in our classification, and therefore as potential sources of soft rot resistance.…”

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confidence: 98%

“…This lack of stability in the soft rot pathogen isolates may be related to environmental conditions (Chung et al, 2011) and/or pathogen virulence.…”

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confidence: 99%

Lettuce genotype resistance to "soft rot" caused by Pectobacterium carotovorum subsp. carotovorum

Félix

Oliveira

Mariano

et al. 2014

Sci. agric. (Piracicaba, Braz.)

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Soft rot, caused by Pectobacterium carotovorum subsp. carotovorum (Pcc), is the main bacterial disease affecting lettuce (Lactuca sativa L.) crops in Brazil and leads to significant yield losses. This study aimed to assess the reaction of lettuce genotypes to soft rot induced by a virulent isolate and the stability of the resistance to three isolates varying in virulence. Using a descriptive ordinal scale ranging from 1 to 9 a classification system was defined: class 1 = resistant (R): severity (Sev) < 1.5; class 2 = moderately resistant (MR): 1.5 ≤ Sev < 2.5; class 3 = susceptible (S): 2.5 ≤ Sev < 3.5; class 4 = highly susceptible (HS): Sev ≥ 3.5). Of the 41 tested genotypes, 14 were classified as MR and 27 as S when inoculated with a Pcc isolate of intermediate virulence. Eleven of these genotypes (four S and seven MR) were selected to test their resistance stability against three other isolates with an increasing degree of virulence (Pcc-36 < Pcc-A1.1 < Pcc-23). Out of the 11 genotypes eight retained the original classification and three moved from S to MR resistant class when challenged with the least virulent isolate. Vitória de Santo Antão was the only genotype classified as MR for all tested isolates and is a promising candidate for durable soft rot resistance breeding.

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“…Solanum albornozii and S. flahaultii , for example, were among the highest ranked species for several minerals. A large amount of phenotypic variation, and presumably genotypic variation, is common within accessions in wild potato (Bamberg et al, 1996; Douches et al, 2001; Jansky et al, 2006, 2008, 2009; Spooner et al, 2009; Chung et al, 2010; Cai et al, 2011). This is expected, considering the wide range of habitats in which wild Solanum species grow.…”

Section: Resultsmentioning

confidence: 99%

Solanum clarum and S. morelliforme as Novel Model Species for Studies of Epiphytism

2016

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The natural history of epiphytic plant species has been extensively studied. However, little is known about the physiology and genetics of epiphytism. This is due to difficulties associated with growing epiphytic plants and the lack of tools for genomics studies and genetic manipulations. In this study, tubers were generated from 223 accessions of 42 wild potato Solanum species, including the epiphytic species S. morelliforme and its sister species S. clarum. Lyophilized samples were analyzed for 12 minerals using inductively coupled plasma optical emission spectrometry. Mineral levels in tubers of S. morelliforme and S. clarum were among the highest for 10 out of the 12 elements evaluated. These two wild potato relatives are native to southern Mexico and Central America and live as epiphytes or in epiphytic-like conditions. We propose the use of S. morelliforme and S. clarum as model organisms for the study of mineral uptake efficiency. They have a short life cycle, can be propagated vegetatively via tubers or cuttings, and can be easily grown in controlled environments. In addition, genome sequence data are available for potato. Transgenic manipulations and somatic fusions will allow the movement of genes from these epiphytes to cultivated potato.

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A Test of Taxonomic and Biogeographic Predictivity: Resistance to Soft Rot in Wild Relatives of Cultivated Potato

Cited by 31 publications

References 31 publications

Comparison of Representative and Custom Methods of Generating Core Subsets of a Carrot Germplasm Collection

Comparison of Representative and Custom Methods of Generating Core Subsets of a Carrot Germplasm Collection

Lettuce genotype resistance to "soft rot" caused by Pectobacterium carotovorum subsp. carotovorum

Solanum clarum and S. morelliforme as Novel Model Species for Studies of Epiphytism

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