A Reexamination of Species Boundaries Between Solanum megistacrolobum and S. toralapanum (Solanum sect. Petota, series Megistacroloba): Morphological Data

Giannattasio, Robert B.; Spooner, David M.

doi:10.2307/2419714

Cited by 24 publications

(17 citation statements)

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“…megistacrolobum and S. megistacrolobum subsp. toralapanum using morphological data [33] and with molecular markers [34]. Based on their analysis they suggested to preserve S. megistacrolobum subsp.…”

Section: Discussionmentioning

confidence: 99%

What's in a name; Genetic structure in Solanum section Petota studied using population-genetic tools

et al. 2011

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BackgroundThe taxonomy and systematic relationships among species of Solanum section Petota are complicated and the section seems overclassified. Many of the presumed (sub)species from South America are very similar and they are able to exchange genetic material. We applied a population genetic approach to evaluate support for subgroups within this material, using AFLP data. Our approach is based on the following assumptions: (i) accessions that may exchange genetic material can be analyzed as if they are part of one gene pool, and (ii) genetic differentiation among species is expected to be higher than within species.ResultsA dataset of 566 South-American accessions (encompassing 89 species and subspecies) was analyzed in two steps. First, with the program STRUCTURE 2.2 in an 'unsupervised' procedure, individual accessions were assigned to inferred clusters based on genetic similarity. The results showed that the South American members of section Petota could be arranged in 16 clusters of various size and composition. Next, the accessions within the clusters were grouped by maximizing the partitioning of genetic diversity among subgroups (i.e., maximizing Fst values) for all available individuals of the accessions (2767 genotypes). This two-step approach produced an optimal partitioning into 44 groups.Some of the species clustered as genetically distinct groups, either on their own, or combined with one or more other species. However, accessions of other species were distributed over more than one cluster, and did not form genetically distinct units.ConclusionsWe could not find any support for 43 species (almost half of our dataset). For 28 species some level of support could be found varying from good to weak. For 18 species no conclusions could be drawn as the number of accessions included in our dataset was too low. These molecular data should be combined with data from morphological surveys, with geographical distribution data, and with information from crossing experiments to identify natural units at the species level. However, the data do indicate which taxa or combinations of taxa are clearly supported by a distinct set of molecular marker data, leaving other taxa unsupported. Therefore, the approach taken provides a general method to evaluate the taxonomic system in any species complex for which molecular data are available.

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Section: Discussionmentioning

confidence: 99%

What's in a name; Genetic structure in Solanum section Petota studied using population-genetic tools

et al. 2011

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“…The difficulty in distinguishing these taxa is evident from a comparison of the identifications of identical herbarium material by Hawkes & Hjerting (1989) and Ochoa (1990) where, excluding types, identifications differ in 26% of the cases . Morphological and molecular studies (Giannattasio & Spooner, 1994a, 1994b showed extensive overlap of characters from both data sets, but the taxa were weakly supported by multivariate techniques . These results, combined with the distributional data (with S. toralapanum growing more to the east of S .…”

Section: Methodsmentioning

confidence: 99%

Bolivia potato germplasm collecting expeditions 1993, 1994: Taxonomy and new germplasm resources

Spooner

Berg²,

Garcia

et al. 1994

Euphytica

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We conducted joint Bolivia/The Netherlands/United States wild potato (Solanum sect . Petota Dumort.) germplasm collecting expeditions in Bolivia from February 1-April 15, 1993, and January 1-February 26, 1994 . The goals of the expeditions were to collect germplasm and gather data for continuing taxonomic studies of the approximately 43 taxa of Bolivian wild potatoes accepted by current taxonomists . We made 223 collections, 135 as true seed collections, 54 as tubers, 19 only as herbarium collections . Two recent taxonomic treatments of Bolivian wild and cultivated potatoes have clarified the taxonomy and distribution of these plants, but there are continuing disagreements between treatments regarding species boundaries and interrelationships . These disagreements, and the variability we observed in natural populations, present problems for identifications . We summarize the state of germplasm collections for Bolivia, provide our field data regarding the taxonomy of Bolivian wild potatoes, provide recommendations for future collecting, and provide new chromosome counts for S. hoopesii, S. ugentii, and S. yungasense .

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“…In Jujuy and Salta grow S. megistacrolobum and S. toralapanum, according to Hawkes and Hjerting (1989) or S. megistacrolobum subsp. toralapanum (Ochoa 1990;Giannattasio and Spooner 1994). The accessions collected were identified as subsp.…”

Section: Wild Speciesmentioning

confidence: 99%

A Potato Collecting Expedition in the Province of Jujuy, Argentina and Disease Indexing of Virus and Fungus Pathogens in Andean Cultivars

Clausen

Colavita

Butzonitch

et al. 2005

Genet Resour Crop Evol

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A potato collecting expedition was carried out in the province of Jujuy, Argentina in March 24 to April 15, 2001. The objective was to collect local cultivars of potatoes and wild potato species, covering high mountain valleys not previously collected or areas where germplasm was not available. A total of 247 accessions was collected, 188 cultivated accessions of S. tuberosum subsp. andigenum, four of Solanum tuberosum subsp. tuberosum, two of S. curtilobum and 53 accessions of wild species. The wild species collected were S. acaule subsp. acaule, S. chacoense, S. infundibuliforme, S. megistacrolobum subsp. megistacrolobum, S. microdontum, S. gourlayi, S. Â viirsooi and S. oplocense. Herbarium voucher specimens were obtained when possible. For the collection of cultivated potatoes, tubers were gathered from farmer's fields and in a few cases from stores or markets. Seed samples were generally obtained for the wild species. Detailed collection site data were recorded at every site. After breaking dormancy, the accessions of the cultivated species were screened for the presence of Potato virus Y (PVY), Potato virus X (PVX), Potato leafroll virus (PLRV), Potato virus S (PVS), Potato virus M (PVM), Potato virus V (PVV), Andean potato latent virus (APLV), Andean potato mottle virus (APMoV), Potato rough dwarf virus (PRDV), Potato spindle tuber viroid (PSTVd) and Spongospora subterranea f. sp. subterranea. PSTVd, APLV and PRDV were not detected, but different levels of infection are reported for the other pathogens assayed.

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A Reexamination of Species Boundaries Between Solanum megistacrolobum and S. toralapanum (Solanum sect. Petota, series Megistacroloba): Morphological Data

Cited by 24 publications

References 13 publications

What's in a name; Genetic structure in Solanum section Petota studied using population-genetic tools

What's in a name; Genetic structure in Solanum section Petota studied using population-genetic tools

Bolivia potato germplasm collecting expeditions 1993, 1994: Taxonomy and new germplasm resources

A Potato Collecting Expedition in the Province of Jujuy, Argentina and Disease Indexing of Virus and Fungus Pathogens in Andean Cultivars

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