Phylogenetic Relationships in the Genus <i>Paspalum</i> (Poaceae: Panicoideae: Paniceae): An Assessment of the Quadrifaria and Virgata Informal Groups

Giussani, Liliana M.; Zuloaga, Fernando O.; Quarín, Camilo Luis; Cota-Sánchez, J. Hugo; Ubayasena, Kumary; Morrone, Osvaldo

doi:10.1600/036364409787602258

Cited by 30 publications

(36 citation statements)

References 52 publications

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“…conspersum (Virgata) and Paspalum exaltatum J. Presl (Quadrifaria) clustered together in the UPGMA dendrogram (Figure 6) and were shown to be genetically related to Paspalum regnellii Mez (Virgata). The genetic proximity of these species corroborates previous phylogenetic studies [99,113]. The Virgata group should be considered monophyletic, and a number of additional species, such as P .…”

Section: Discussionsupporting

confidence: 88%

“…The Virgata group should be considered monophyletic, and a number of additional species, such as P . exaltatum , should be included in it [113]. Moreover, their data supported the idea that P .…”

Section: Discussionmentioning

confidence: 66%

“…Chromosome number, type of polyploidy, reproduction mode and genomes found in the Paspalum species based on the literature [17,27,30-32,102-104,106-108,110,113,114],[122,124,125,127-157]. …”

Section: Supplementary Materialsmentioning

confidence: 99%

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Genetic variation in polyploid forage grass: Assessing the molecular genetic variability in the Paspalumgenus

et al. 2013

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BackgroundPaspalum (Poaceae) is an important genus of the tribe Paniceae, which includes several species of economic importance for foraging, turf and ornamental purposes, and has a complex taxonomical classification. Because of the widespread interest in several species of this genus, many accessions have been conserved in germplasm banks and distributed throughout various countries around the world, mainly for the purposes of cultivar development and cytogenetic studies. Correct identification of germplasms and quantification of their variability are necessary for the proper development of conservation and breeding programs. Evaluation of microsatellite markers in different species of Paspalum conserved in a germplasm bank allowed assessment of the genetic differences among them and assisted in their proper botanical classification.ResultsSeventeen new polymorphic microsatellites were developed for Paspalum atratum Swallen and Paspalum notatum Flüggé, twelve of which were transferred to 35 Paspalum species and used to evaluate their variability. Variable degrees of polymorphism were observed within the species. Based on distance-based methods and a Bayesian clustering approach, the accessions were divided into three main species groups, two of which corresponded to the previously described Plicatula and Notata Paspalum groups. In more accurate analyses of P. notatum accessions, the genetic variation that was evaluated used thirty simple sequence repeat (SSR) loci and revealed seven distinct genetic groups and a correspondence of these groups to the three botanical varieties of the species (P. notatum var. notatum, P. notatum var. saurae and P. notatum var. latiflorum).ConclusionsThe molecular genetic approach employed in this study was able to distinguish many of the different taxa examined, except for species that belong to the Plicatula group, which has historically been recognized as a highly complex group. Our molecular genetic approach represents a valuable tool for species identification in the initial assessment of germplasm as well as for characterization, conservation and successful species hybridization.

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Section: Discussionsupporting

confidence: 88%

Section: Discussionmentioning

confidence: 66%

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Genetic variation in polyploid forage grass: Assessing the molecular genetic variability in the Paspalumgenus

et al. 2013

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“…The informal grouping originally proposed by Chase (1929), which is based on morphological similarities, is widely accepted. Despite the publication of a number of taxonomic revisions of particular groups in the last 10 years (Oliveira and Valls 2002;Oliveira 2004;Morrone 2001, 2005;Zuloaga et al 2004;Denham 2005; and references therein), phylogenetic hypotheses are still fragmentary (Rua and Aliscioni 2002;Denham et al 2002;Souza-Chies et al 2006;Denham and Zuloaga 2007;Rua et al 2007;Scataglini et al 2007;Giussani et al 2009). Consequently, no phylogeny of the genus as a whole is currently available and infrageneric relationships remain uncertain and require further studies.…”

Section: Introductionmentioning

confidence: 99%

A phylogenetic analysis of the genus Paspalum (Poaceae) based on cpDNA and morphology

et al. 2010

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With about 350 species, Paspalum is one of the richest genera within the Poaceae. Its species inhabit ecologically diverse areas along the Americas and they are largely responsible for the biodiversity of grassland ecosystems in South America. Despite its size and relevance, no phylogeny of the genus as a whole is currently available and infrageneric relationships remain uncertain. Many Paspalum species consist of sexual-diploid and apomicticpolyploid cytotypes, and several have arisen through hybridization. In this paper we explore the phylogenetic structure of Paspalum using sequence data of four noncoding cpDNA fragments from a wide array of species which were combined with morphological data for a subset of diploid taxa. Our results confirmed the general monophyly of Paspalum if P. inaequivalve is excluded and the small genus Thrasyopsis is included. Only one of the four currently recognized subgenera was monophyletic but nested within the remainder of the genus. Some informal morphological groups were found to be polyphyletic. The placement of known allopolyploid groups is generally congruent with previously stated hypotheses although some species with shared genomic formulae formed paraphyletic arrangements. Other species formed a basal grade including mostly umbrophilous or hygrophilous species. It is hypothesized that the genus may have diversified as a consequence of the expansion of C4 grass-dominated grasslands in South America.

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“…Phylogenetic distance was clarified in a recent study, where P. conspersum remained in the Virgata clade, while P. regnellii was part of a different clade, Macrophylla (Giussani et al, 2009). Valls and Oliveira (2012) did not list P. conspersum for Rio Grande do Sul State in their contribution for the genus for the online Flora of Brazil database.…”

Section: Introductionmentioning

confidence: 99%

Microsporogenesis in Paspalum conspersum Schrad. (Virgata group) with different ploidy levels

Janke

Souza

Valls³

et al. 2013

Genet. Mol. Res.

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ABSTRACT. Knowledge about the cytology and reproductive behavior of a species is indispensable for hybridization programs. This is especially true for species belonging to the genus Paspalum, among which apomixis and a wide range of ploidy levels are frequently found. Paspalum conspersum Schrad. is a robust and warm-season perennial bunchgrass native to South America. Previous studies have indicated that both tetraploid and hexaploid races exist in this species; however, only information related to tetraploids has been applied to another taxon. In this study, a cytological investigation in two Brazilian accessions collected in different regions revealed tetraploidy in the accession BRA-012823 (2n = 4x = 40), with chromosome pairing in bivalents and normal meiosis and tetrad formation, and pentaploidy (2n = 5x = 50) in the accession BRA-022748, which presented total asynapsis. In this latter accession, 50 univalents could be scored at diakinesis. After alignment at the metaphase plate, sister chromatids segregated to the poles. Only one meiotic division (equational) occurred, and after 4949©FUNPEC-RP www.funpecrp.com.br Genetics and Molecular Research 12 (4): 4948-4957 (2013) Microsporogenesis in Paspalum conspersum cytokinesis, 100% of the dyads that formed had 2n microspores. The meiotic behavior during microsporogenesis, which showed 10 delayed univalents to reach the metaphase plate, suggests that this accession is a recent natural hybrid constituted by a parental genome with 40 chromosomes and another with 10 chromosomes. The potential usage of these accessions in Paspalum breeding has been discussed.

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Phylogenetic Relationships in the Genus Paspalum (Poaceae: Panicoideae: Paniceae): An Assessment of the Quadrifaria and Virgata Informal Groups

Cited by 30 publications

References 52 publications

Genetic variation in polyploid forage grass: Assessing the molecular genetic variability in the Paspalumgenus

Genetic variation in polyploid forage grass: Assessing the molecular genetic variability in the Paspalumgenus

A phylogenetic analysis of the genus Paspalum (Poaceae) based on cpDNA and morphology

Microsporogenesis in Paspalum conspersum Schrad. (Virgata group) with different ploidy levels

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