Cytotaxonomy of Lychnophoriopsis Sch.Bip. and Paralychnophora MacLeish species (Asteraceae: Vernonieae: Lychnophorinae)

Mansanares, Mariana Esteves; Forni‐Martins, Eliana Regina; Semir, João

doi:10.1111/j.1095-8339.2007.00634.x

Cited by 6 publications

(2 citation statements)

References 20 publications

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“…This family has for long interested scientists due to a large variation in karyotype characteristics (Ruas et al , Mansanares et al ). Within Asteraceae, Vernonieae is one of the most complex tribes characteristised by its high karyotypic diversity including a wide range of basic chromosome numbers: x = 7, 8, 9, 10, 11, 12, 14, 15, 16, 17, 18, 19, 23 and 31 (Turner , Ruas et al , Dematteis , Mansanares et al , Salles de Melo et al ). Of these x = 9 or x = 10, reported for African and Asian species, are considered to be ancestral in the tribe (Jones ).…”

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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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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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“…All members of the Vernonieae tribe classified thus far from India and North, South, and Central America, including Stokesia, have chromosomes that are fairly symmetrical and classified mainly as either metacentric or submetacentric (Dematteis, 1998(Dematteis, , 2002Dematteis and Fernández, 1998;De Oliveira et al, 2007;Esteves Mansanares et al, 2007;Mathew and Mathew, 1983;Ruas et al, 1991;Smith and Jones, 1987). The TCLs of Stokesia (i.e., 8 to 16 mm), however, were significantly greater than that observed for any of the other Vernonieae species (i.e., 1 to 4 mm).…”

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Cytogenetic Characterization and Nuclear DNA Content of Diploid and Tetraploid Forms of Stokes Aster

Barb¹,

Werner²,

Tallury³

2008

horts

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Stokesia laevis (J. Hill) Greene is a herbaceous perennial native to the southeastern United States. Most cultivars of Stokesia are diploid (2n = 2x = 14) except for ‘Omega Skyrocket’, a tetraploid (2n = 4x = 28) form selected from a natural population. A comparative study of the karyotypes and meiotic behavior of diploid cultivars, seed-derived accessions of ‘Omega Skyrocket’, synthetically derived autotetraploids, and triploid progeny from these taxa strongly suggest that ‘Omega Skyrocket’ is an autotetraploid form of Stokesia. Total karyotype length, 161 μm and 293 μm, and average chromosome length, 11.5 μm and 10.5 μm, of the diploid cultivars and tetraploid accessions of ‘Omega Skyrocket’, respectively, were determined. The karyotype of the diploid cultivars consisted of eight metacentric (m) and six submetacentric (sm) chromosomes with average arm ratio values ranging from 1.12 to 2.06. The karyotype of ‘Omega Skyrocket’ consisted of 23 m chromosomes and 5 sm chromosomes with average arm ratio values ranging from 1.22 to 2.02. Meiotic pairing in the diploids was normal. No meiotic irregularities such as laggards or bridges were observed and disjunction was balanced (7:7). Accessions of ‘Omega Skyrocket’ demonstrated a high frequency (60%) of quadrivalent formation; however, later stages of meiosis were regular with balanced disjunction (14:14) occurring in 95% of the cells. Meiotic configurations in synthetically derived autotetraploids and triploid hybrids from crosses of diploid cultivars × ‘Omega Skyrocket’ consisted of univalents, bivalents, trivalents, quadrivalents, and pentavalents. Abnormalities, including laggards, unequal and/or premature disjunction, chromosome bridges, and chromosome stickiness were observed. Average nuclear 2C DNA content was 20.3 pg for the diploid cultivars and 39.9 pg for the newly synthesized autotetraploids. Average nuclear 2C DNA content for ‘Omega Skyrocket’ was 37.3 pg, which was 8.2% less than twice the average 2C DNA content of the diploid accessions and 6.4% less than the newly synthesized autotetraploids, suggesting that genomic downsizing in ‘Omega Skyrocket’ has occurred. Similarity of the karyotypes of the diploids and ‘Omega Skyrocket’ and the slight reduction in nuclear DNA content suggest that ‘Omega Skyrocket’ has diverged little from its original diploid progenitor.

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Karyological features and cytotaxonomy of the tribe Vernonieae (Asteraceae)

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Cytotaxonomy of Lychnophoriopsis Sch.Bip. and Paralychnophora MacLeish species (Asteraceae: Vernonieae: Lychnophorinae)

Cited by 6 publications

References 20 publications

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

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

Cytogenetic Characterization and Nuclear DNA Content of Diploid and Tetraploid Forms of Stokes Aster

Karyological features and cytotaxonomy of the tribe Vernonieae (Asteraceae)

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