Karyotype analysis and DNA content in some species of<i>Chrysolaena</i>(Vernonieae, Asteraceae)

Pico, Gisela Mariel Via Do; Dematteis, Massimiliano

doi:10.1080/11263504.2012.751068

Cited by 9 publications

(18 citation statements)

References 47 publications

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“…The karyotypes of the taxa here studied are formed by metacentric and submetacentric chromosomes, and are quite symmetrical due the predominance of metacentric chromosomes. This is a common feature in species of the tribe Vernonieae (Ruas et al 1991, Dematteis 1997a, 1997b, 1998, Dematteis and Fernández 1998, 2000, Oliveira et al 2007a, 2007b, Angulo and Dematteis 2009b, Via do Pico and Dematteis 2012b). Chrysolaena sceptrum presents the most symmetric karyotype, which is reflected in the highest average centromeric index and the lowest intrachromosomal asymmetry coefficient (A 1 ).…”

Section: Discussionmentioning

confidence: 94%

“…The review of chromosomal studies reveals that the tetraploid cytotype is the most common. From nine species in which chromosome number is known, seven had populations with tetraploid cytotypes (Dematteis 1997a, 1997b, 1998, 2002, 2009, Dematteis et al 2007, Angulo and Dematteis 2009b, Via do Pico and Dematteis 2012a, b). Ploidy differences are not restricted to comparisons between species, but also occur frequently within species (Miller 1978, Burton and Husband 1999, Weiss et al 2003).…”

Section: Discussionmentioning

confidence: 99%

“…Since the taxonomic treatment realized by Robinson (1988), where the author segregates Chrysolaena from Vernonia Schreb., 1791, most of the studies have been focused in nomenclature, anatomy, cytology and palynology (Martins and Oliveira 2007, Oliveira et al 2007b, Mendonça et al 2007, Dematteis 2009, Galastri et al 2010, Via do Pico and Dematteis 2012a, 2012b, 2013, Appezzato-da-Glória et al 2012). Despite these contributions, the chromosome information is still scarce.…”

Section: Introductionmentioning

confidence: 99%

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Cytotaxonomy of two species of genus Chrysolaena H. Robinson, 1988 (Vernonieae, Asteraceae) from Northeast Paraguay

Pico¹,

Dematteis²

2014

CCG

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Chromosome counts and karyotypes of two species of Chrysolaena H. Robinson 1988 are presented in this paper. Mitotic analysis revealed that both taxa have x=10, a basic chromosome number considered characteristic of the genus. The chromosome number and the karyotype of Chrysolaena cristobaliana are reported for the first time, as well as a new cytotype and the karyotype of Chrysolaena sceptrum. Chrysolaena cristobaliana showed heptaploid cytotype with 2n=7x=70 and a karyotype composed of 46 m + 24 sm chromosomes. On the other hand, Chrysolaena sceptrum presented tetraploid cytotype with 2n=4x=40 and a karyotype with 30 m + 10 sm chromosomes. Accessory chromosomes were observed in cells of both species. The chromosome analysis showed that these species differ in the chromosome number and the total chromosome length, although they showed similar chromosome morphology and asymmetry indexes. The results support the use of chromosome data in taxonomic treatments of the American members of the tribe Vernonieae.

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Section: Discussionmentioning

confidence: 94%

Section: Discussionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

See 1 more Smart Citation

Cytotaxonomy of two species of genus Chrysolaena H. Robinson, 1988 (Vernonieae, Asteraceae) from Northeast Paraguay

Pico¹,

Dematteis²

2014

CCG

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“…with higher basic number and smaller chromosomes (Ruas et al , Dematteis , , Dematteis and Fernández ). According to this interpretation, Chrysolaena (x = 10) should have larger chromosomes than Lessingianthus (x = 16) and Lepidaploa (x = 14, 15 and 16) (Dematteis , , Angulo and Dematteis , Via do Pico and Dematteis ). However, this is supported only in part, because mean chromosome length ranges overlap among the three genera (Table ).…”

Section: Discussionmentioning

confidence: 99%

“…Karyotypes of Lessingianthus, Chrysolaena and Lepidaploa species were additionally analyzed using a principal component analysis (PCA). A data matrix of 19 operational taxonomic units (OTUs) and nine variables was constructed using our and published results (Dematteis , Angulo and Dematteis , Via do Pico and Dematteis ; Table ). The nine karyotype variables analyzed were: TKL; CI; A 1 and A 2 indices; number of m, sm, and st chromosomes; and basic numbers x and 2n.…”

Section: Methodsmentioning

confidence: 99%

Karyotypes of some species of the genus Lessingianthus (Vernonieae, Asteraceae) and taxonomic implications

Angulo

Dematteis

2014

Nordic Journal of Botany

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We determined the karyotypes of nine species of Lessingianthus , eight of which are here analyzed for the fi rst time. Th e results include the fi rst chromosome count for L. plantaginoides , which is tetraploid with 2n ϭ 64. All species showed a high proportion of metacentric chromosomes combined with a lower proportion of submetacentric pairs. Only L. coriaceus had a subtelocentric chromosome pair. B chromosomes were observed in L. coriaceus and L. varroniifolius , which were subtelocentric. Diff erences among the karyotypes of the studied species were small, suggesting that karyotype diversity in the genus evolved by small changes in the structure of chromosomes. Karyotype features appear useful to distinguish Lessingianthus from the closely related genera Chrysolaena and Lepidaploa .

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Cytotaxonomy of some species ofVernonanthuraandVernonia(Asteraceae, Vernonieae) from South America

Vega

Dematteis

2016

Caryologia

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The number and behavior of meiotic chromosomes in four populations of three species of Vernonanthura were analyzed. It was observed that all stages of meiosis were stable without chromosomal irregularities. The somatic chromosome number is reported for four populations of three species of Vernonanthura and two populations of Vernonia. All species were diploid with 2n = 34. The first chromosome count is presented for Vernonanthura chaquensis (2n = 17II and 2n = 34). The karyotypes were determined for Vernonanthura lucida (32m + 2sm), V. oligactoides (24m + 10sm) and V. pseudolinearifolia (28m + 6sm); they are presented for the first time. The total length of the karyotype was 31.67μ-40.48 μm. The average chromosome length was 1.86μ-2.38 μm and the centromeric index was 38.61-42.99. Vernonanthura oligactoides showed the smallest variation of chromosome length within the karyotype (1.42 μm) while V. squamulosa had the biggest (2.15 μm). The different karyotypic parameters were analyzed with two statistic tests. The resulting species arrangement from Unweighted Pair Group Method with Arithmetic Mean (UPGMA) grouping analysis fully fits with that obtained with principal component analysis (PCA). Both tests demonstrated congruence between karyotypic parameter and classification based on morphological characters.

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Karyotype analysis and DNA content in some species ofChrysolaena(Vernonieae, Asteraceae)

Cited by 9 publications

References 47 publications

Cytotaxonomy of two species of genus Chrysolaena H. Robinson, 1988 (Vernonieae, Asteraceae) from Northeast Paraguay

Cytotaxonomy of two species of genus Chrysolaena H. Robinson, 1988 (Vernonieae, Asteraceae) from Northeast Paraguay

Karyotypes of some species of the genus Lessingianthus (Vernonieae, Asteraceae) and taxonomic implications

Cytotaxonomy of some species ofVernonanthuraandVernonia(Asteraceae, Vernonieae) from South America

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