Phylogenetic Relationships of Wild Potatoes, Solanum Series Conicibaccata (Sect. Petota)

Castillo, Raul O.; Spooner, David M.

doi:10.2307/2419677

Cited by 46 publications

(28 citation statements)

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“…However, the St24 signals were not located on The bootstrap values were based on plastid DNA analyses of Spooner et al (1993), Spooner and Castillo (1997), and Castillo and Spooner (1997). Figure 9N.…”

Section: Evolution Of the Centromeric Satellite Repeats In Solanum Spmentioning

confidence: 99%

Repeatless and Repeat-Based Centromeres in Potato: Implications for Centromere Evolution

et al. 2012

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Centromeres in most higher eukaryotes are composed of long arrays of satellite repeats. By contrast, most newly formed centromeres (neocentromeres) do not contain satellite repeats and instead include DNA sequences representative of the genome. An unknown question in centromere evolution is how satellite repeat-based centromeres evolve from neocentromeres. We conducted a genome-wide characterization of sequences associated with CENH3 nucleosomes in potato (Solanum tuberosum). Five potato centromeres (Cen4, Cen6, Cen10, Cen11, and Cen12) consisted primarily of single-or low-copy DNA sequences. No satellite repeats were identified in these five centromeres. At least one transcribed gene was associated with CENH3 nucleosomes. Thus, these five centromeres structurally resemble neocentromeres. By contrast, six potato centromeres (Cen1, Cen2, Cen3, Cen5, Cen7, and Cen8) contained megabase-sized satellite repeat arrays that are unique to individual centromeres. The satellite repeat arrays likely span the entire functional cores of these six centromeres. At least four of the centromeric repeats were amplified from retrotransposon-related sequences and were not detected in Solanum species closely related to potato. The presence of two distinct types of centromeres, coupled with the boom-and-bust cycles of centromeric satellite repeats in Solanum species, suggests that repeat-based centromeres can rapidly evolve from neocentromeres by de novo amplification and insertion of satellite repeats in the CENH3 domains.

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Section: Evolution Of the Centromeric Satellite Repeats In Solanum Spmentioning

confidence: 99%

Repeatless and Repeat-Based Centromeres in Potato: Implications for Centromere Evolution

et al. 2012

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“…One example is offered by Coreopsis, in which two plastome classes (A and B) found in a wide survey of Coreopsis grandiflora may have been phylogenetic ally sorted into various populations of this species and other Coreopsis taxa (Mason-Gamer et aI., 1995). Additional examples include wild potatoes (Castillo and Spooner, 1997) and popUlations of two species of Phacelia (Levy et aI., 1996).…”

Section: Hybridization and Introgressionmentioning

confidence: 99%

Phylogenetic Incongruence: Window into Genome History and Molecular Evolution

Wendel¹,

Doyle²

1998

Molecular Systematics of Plants II

521

432

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“…These generate confusion among users regarding the best taxonomy to use, and even the reliability of taxonomy to guide users at all. Chloroplast DNA restriction site data (Rodríguez and Spooner, 1997;Spooner and Castillo, 1997;Castillo and Spooner, 1997), have suggested that the 21 series of Hawkes (1990) are not natural groups, but rather support only four branches of a phylogenetic tree (clades) (Fig. 3).…”

Section: Ingroup Studiesmentioning

confidence: 99%

Species Concepts and Relationships in Wild and Cultivated Potatoes

Spooner¹,

Bryan²,

Berg³

et al. 2003

Acta Hortic.

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Wild and cultivated potatoes (Solanum section Petota) present challenges to taxonomists arising from lack of clearly defined morphological character differences among many species, phenotypic plasticity, a range of ploidy levels from diploid to hexaploid, and hybrid speciation and introgression. Taxonomic treatments of the group have differed greatly regarding numbers of species and hypotheses of their interrelationships at the series level. Recent morphological phenetic studies and molecular studies have confirmed the general lack of clearly defined species, have shown the need to use a number of character states with overlapping ranges for species delimitation (polythetic support), and have suggested the need for the reduction of species in section Petota. Molecular studies have sometimes confirmed hypotheses of hybridization and sometimes have failed to support them. Molecular studies have suggested the need for a reconsideration of the traditionally held series concepts. Currently, section Petota contains 196 wild species and a single cultivated species, Solanum tuberosum, with eight landrace cultivar groups, exclusive of the modern cultivars that are not yet classified into cultivar groups. The number of wild species likely will decrease with future study. These points are here illustrated by (1) a discussion of published species level studies in Solanum series Longipedicellata, the Solanum brevicaule complex, and the cultivated landrace populations of potatoes; (2) reinvestigations of hybridization in S. chacoense, S. raphanifolium and S. ×rechei; and (3) studies of ingroup and outgroup relationships of section Petota. INTRODUCTIONSolanum L. section Petota Dumort., the potato and its wild relatives, is distributed from the southwestern United States to southern Chile, with a concentration of diversity in the Andes. Section Petota traditionally presents challenges to taxonomists arising from similarity among species, phenotypic plasticity, a range of ploidy levels from diploid to hexaploid, and hybrid speciation and introgression. Different taxonomists have recognized different numbers of species and have grouped these species quite differently into series. The latest comprehensive taxonomic treatment by Hawkes (1990) recognized 232 species, partitioned into 21 series. Spooner and Hijmans (2001) updated this to 196 wild species and seven cultivated species, considering taxonomic changes (new species descriptions and synonymized species) made since 1990.

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Phylogenetic Relationships of Wild Potatoes, Solanum Series Conicibaccata (Sect. Petota)

Cited by 46 publications

References 0 publications

Repeatless and Repeat-Based Centromeres in Potato: Implications for Centromere Evolution

Repeatless and Repeat-Based Centromeres in Potato: Implications for Centromere Evolution

Phylogenetic Incongruence: Window into Genome History and Molecular Evolution

Species Concepts and Relationships in Wild and Cultivated Potatoes

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