Karyotype studies on populations of two Hypochaeris species (H. catharinensis and H. lutea), Asteraceae, endemics to southern Brazil

Fiorin, Fernando Gianetti; Ruas, Paulo Maurício; Ortiz, M. Ángeles; Urtubey, Estrella; Matzenbacher, Nélson Ivo; Ruas, Claudete de Fátima

doi:10.4238/2013.january.4.4

Cited by 3 publications

(6 citation statements)

References 17 publications

(49 reference statements)

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“…The first group comprised six populations (CS, BN, CF, GUA, RQ and SJ) and the second was formed by the remaining five populations (SR, FCM, BJ, SM, and RR), with the RR population more isolated from the others within this group. Cytogenetic studies revealed the polyploid nature of the RR population (Fiorin et al 2013). However, the authors were not able to define the type o polyploid (autopoliploid or allopolyploid).…”

Section: Discussionmentioning

confidence: 96%

“…Cytogenetic studies revealed the polyploid nature of the RR population (Fiorin et al . ). However, the authors were not able to define the type o polyploid (autopoliploid or allopolyploid).…”

Section: Discussionmentioning

confidence: 97%

“…Collection areas included the states of Paraná, Santa Catarina, and Rio Grande do Sul, resulting in 25 plants per population, except for the population of Serra do Rio do Rastro (FUEL-40654), which was represented by 20 plants totalling 270 individuals. The karyotypes from five of the 11 populations investigated here were determined by Fiorin et al (2013), one of which (population Serra do Rio do Rastro; RR), showed poliploidy, a phenomenon reported for only few species of Hypochaeris (Weiss-Schneeweiss et al 2007, 2008. Voucher specimens, from each population (Table 1, Fig.…”

Section: Species and Samplingmentioning

confidence: 88%

“…Hypochaeris lutea is a diploid (Fiorin et al 2013), perennial, and insect-or wind-pollinated herb with a distribution range that covers part of the temperate and subtropical regions of the South American continent. This species is particularly represented at altitudes around 1000 m in cold swamps of southern Brazil, with few scattered individuals reported in southeastern states.…”

Section: Species and Samplingmentioning

confidence: 99%

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Population genetic structure of the South American species Hypochaeris lutea (Asteraceae)

Rodrigues

Ruas

et al. 2015

Plant Species Biology

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The genus Hypochaeris has a recent evolutionary history caused by long-distance dispersal in conjunction with adaptive radiation in the South American continent. Hypochaeris lutea is a perennial herb that grows mostly at altitudes of around 1000 m in cold swamps of the southern regions of Brazil. We investigated the amplified fragment length polymorphism (AFLP) in 270 individuals representing 11 Brazilian populations of H. lutea to elucidate the population genetic structure of this species. The frequencies of polymorphic loci and gene diversity ranged from 83.42% to 91.66% and from 0.26 to 0.34, respectively. Analysis of molecular variance revealed that most of the genetic variability was found within (76.67%) rather than among (23.3%) populations, agreeing with the pattern of genetic distribution within and among populations observed in other allogamous species of Hypochaeris. A Mantel test showed no correlation between genetic and geographic distances when all populations were considered. Simulations performed using a Bayesian approach consistently identified two clusters with different admixture proportions of individuals, as also revealed by a UPGMA dendrogram of populations. The pattern of genetic structure observed in H. lutea is consistent with a process of successive colonization events by long-distance dispersal resembling the rapid and recent radiation that has been proposed to explain the origin of the South American species of Hypochaeris.

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Section: Discussionmentioning

confidence: 96%

Section: Discussionmentioning

confidence: 97%

Section: Species and Samplingmentioning

confidence: 88%

Section: Species and Samplingmentioning

confidence: 99%

See 2 more Smart Citations

Population genetic structure of the South American species Hypochaeris lutea (Asteraceae)

Rodrigues

Ruas

et al. 2015

Plant Species Biology

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“…Bimodal karyotypes are common within several animals groups, such as birds, reptiles, and amphibians (Stock and Mengden, 1975; Masabanda et al, 2004; Noronha et al, 2016). Also, many plant genera, such as Agave , Yucca , Hosta (Akemine, 1935; Watkins, 1936; Palomino et al, 2012), Aloe (Brandham and Doherty, 1998; Fentaw et al, 2013), and Hypochaeris (Fiorin et al, 2013), show bimodal karyotypes.…”

Section: Introductionmentioning

confidence: 99%

Together But Different: The Subgenomes of the Bimodal Eleutherine Karyotypes Are Differentially Organized

et al. 2019

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Bimodal karyotypes are characterized by the presence of two sets of chromosomes of contrasting size. Eleutherine bulbosa (2n = 12) presents a bimodal karyotype with a large chromosome pair, which has a pericentric inversion in permanent heterozygosity with suppressed recombination, and five pairs of three to four times smaller chromosomes. Aiming to understand whether high copy number sequence composition differs between both chromosome sets, we investigated the repetitive DNA fraction of E. bulbosa and compared it to the chromosomal organization of the related Eleutherine latifolia species, not containing the pericentric inversion. We also compared the repetitive sequence proportions between the heteromorphic large chromosomes of E. bulbosa and between E. bulbosa and E. latifolia to understand the influence of the chromosome inversion on the dynamics of repetitive sequences. The most abundant repetitive families of the genome showed a similar chromosomal distribution in both homologs of the large pair and in both species, apparently not influenced by the species-specific inversions. The repeat families Ebusat1 and Ebusat4 are localized interstitially only on the large chromosome pair, while Ebusat2 is located in the centromeric region of all chromosomes. The four most abundant retrotransposon lineages are accumulated in the large chromosome pair. Replication timing and distribution of epigenetic and transcriptional marks differ between large and small chromosomes. The differential distribution of retroelements appears to be related to the bimodal condition and is not influenced by the nonrecombining chromosome inversions in these species. Thus, the large and small chromosome subgenomes of the bimodal Eleutherine karyotype are differentially organized and probably evolved by repetitive sequences accumulation on the large chromosome set.

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Karyotype studies on Lycoris radiata populations from China

Liu¹,

Zheng²,

Tao³

et al. 2016

Genet. Mol. Res.

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ABSTRACT. Lycoris radiata is an important medicinal and ornamental plant of China. In the present study, somatic chromosome counts and karyotype analyses, which are important aspects of plant phylogeny and evolution, were performed in 466 individuals from 25 L. radiata populations by root tip squash method. Chromosome counts revealed that 10 populations were diploid (2n = 2x = 22) and 15 were triploid (2n = 3x = 33). Except for one diploid population containing some triploid plants, the remaining 24 populations showed a single cytotype. Karyotype analysis showed that the karyotypes of L. radiata varied in different populations and even within the same population. However, based on the Stebbins' system, the karyotype of all the populations could be classified in 4A classes. The cluster analysis and ordination methods demonstrated that the L. radiata populations grouped in two major clusters. Previous research has shown that the triploid strain of L. radiata is a genetically identical species. However, the cluster analysis revealed that the triploid strains clustered in two groups instead of one, which indicates that these strains may not be identical species, genetically. This study is expected to improve the understanding of the genetic diversity in L. radiata and provide a basis for future studies on species differentiation, speciation, and taxonomy.

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Karyotype studies on populations of two Hypochaeris species (H. catharinensis and H. lutea), Asteraceae, endemics to southern Brazil

Abstract: Karyotype studies on populations of two Hypochaeris species (H. catharinensis and H. lutea), Asteraceae, endemics to southern Brazil

Cited by 3 publications

References 17 publications

Population genetic structure of the South American species Hypochaeris lutea (Asteraceae)

Population genetic structure of the South American species Hypochaeris lutea (Asteraceae)

Together But Different: The Subgenomes of the Bimodal Eleutherine Karyotypes Are Differentially Organized

Karyotype studies on Lycoris radiata populations from China

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