Comparative karyology of the grass subtribesAristaveninae andAirinae (Poaceae ? Aveneae)

Albers, Focke

doi:10.1007/bf01004624

Cited by 23 publications

(17 citation statements)

References 41 publications

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“…Both species are dip loid, n = x = 7 (Table 2), with normal meiosis. This de viates from the somatic chromosome number of 28 usu ally reported for A. caryophyllea (Albers & Albers 1973;Queiros 1974;Albers 1978;1980;Kirschner et al 1982). However, a diploid specimen has been reported by Romero Zarco (1988).…”

Section: Andlsupporting

confidence: 68%

Cytogenetic studies in some representatives of the subfamily Pooideae (Poaceae) in South Africa. 1. The tribe Aveneae, subtribe Aveninae

Spies

Wyk

et al. 1996

Bothalia

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This is a report on chromosome numbers for 14 species of the subtribe Aveninae. which is largely naturalized in South Africa. This is the first chromosome number report for Helictotrichon longifolium (Nees) Schweick. (n = 14). H. longum (Stapf)Schweick. (n = 14). H. namaquensis Schweick. (n = 14) and Lophochloa cristata (L.) Hyl. (n = 7, 21/2. 14). The subtribe has a basic chromosome number of seven, and fewer ploidy levels occur in the naturalized species in South Africa than in the same species in other parts of the world. All tetraploid specimens were alloploids.

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Section: Andlsupporting

confidence: 68%

Cytogenetic studies in some representatives of the subfamily Pooideae (Poaceae) in South Africa. 1. The tribe Aveneae, subtribe Aveninae

Spies

Wyk

et al. 1996

Bothalia

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“…The intraspecific chromosomal variability of satDNA could explain the lack of association between chromosomal changes and phylogenetic relationships observed in Deschampsia species ( Figure 5 ). Since the chromosome morphologies and karyotype composition remain highly conserved in Deschampsia ( Kawano, 1963 ; Albers, 1980 ; Winterfeld and Röser, 2007b ; Cardone et al, 2009 ; González et al, 2016 , 2021 ), the high variability of sequences distribution is likely a consequence of differential amplification and loss of repetitive DNA loci between lineages ( Fry and Salser, 1977 ; Ruiz-Ruano et al, 2016 ). Also small rearrangements can be involved, without notable changes in chromosome numbers and morphologies ( Raskina et al, 2008 ; Nani et al, 2016 ).…”

Section: Discussionmentioning

confidence: 99%

Chromosomal Differentiation of Deschampsia (Poaceae) Based on Four Satellite DNA Families

2021

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Diverse families of satellite DNA (satDNA) were detected in heterochromatin regions of Deschampsia. This kind of repetitive DNA consists of tandem repeat sequences forming big arrays in genomes, and can contribute to lineages differentiation. The differentiation between types of satDNA is related to their sequence identity, the size and number of monomers forming the array, and their chromosomal location. In this work, four families of satDNA (D2, D3, D12, D13), previously isolated by genomic analysis, were studied on chromosomal preparations of 12 species of Deschampsia (D. airiformis, D. antarctica, D. cespitosa, D. cordillerarum, D. elongata, D. kingii, D. laxa, D. mendocina, D. parvula, D. patula, D. venustula, and Deschampsia sp) and one of Deyeuxia (D. eminens). Despite the number of satDNA loci showing interspecific variation, the general distribution pattern of each satDNA family is maintained. The four satDNA families are AT-rich and associated with DAPI + heterochromatin regions. D2, D3, and D12 have mainly subterminal distribution, while D13 is distributed in intercalary regions. Such conservation of satDNA patterns suggests a not random distribution in genomes, where the variation between species is mainly associated with the array size and the loci number. The presence of satDNA in all species studied suggests a low genetic differentiation of sequences. On the other hand, the variation of the distribution pattern of satDNA has no clear association with phylogeny. This may be related to high differential amplification and contraction of sequences between lineages, as explained by the library model.

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“…Corynephorus canescens is a tussock‐building pioneer grass species, with life span of 2–6 years (Marshall ; Böger ). It is diploid (2n = 14; Albers ), wind‐pollinated and predominantly outcrossing (Böger ). Reproduction is almost exclusively by seed (Marshall ), although clonal growth has occasionally been reported (Schulz ; Frey & Hensen ).…”

Section: Methodsmentioning

confidence: 99%

Holocene re‐colonisation, central–marginal distribution and habitat specialisation shape population genetic patterns within an Atlantic European grass species

2014

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Corynephorus canescens (L.) P.Beauv. is an outbreeding, short-lived and wind-dispersed grass species, highly specialised on scattered and disturbance-dependent habitats of open sandy sites. Its distribution ranges from the Iberian Peninsula over Atlantic regions of Western and Central Europe, but excludes the two other classical European glacial refuge regions on the Apennine and Balkan Peninsulas. To investigate genetic patterns of this uncommon combination of ecological and biogeographic species characteristics, we analysed AFLP variation among 49 populations throughout the European distribution range, expecting (i) patterns of SW European glacial refugia and post-glacial expansion to the NE; (ii) decreasing genetic diversity from central to marginal populations; and (iii) interacting effects of high gene flow and disturbance-driven genetic drift. Decreasing genetic diversity from SW to NE and distinct gene pool clustering imply refugia on the Iberian Peninsula and in western France, from where range expansion originated towards the NE. High genetic diversity within and moderate genetic differentiation among populations, and a significant pattern of isolation-by-distance indicate a gene flow drift equilibrium within C. canescens, probably due to its restriction to scattered and dynamic habitats and limited dispersal distances. These features, as well as the re-colonisation history, were found to affect genetic diversity gradients from central to marginal populations. Our study emphasises the need for including the specific ecology into analyses of species (re-)colonisation histories and range centre-margin analyses. To account for discontinuous distributions, new indices of marginality were tested for their suitability in studies of centre-periphery gradients.

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Comparative karyology of the grass subtribesAristaveninae andAirinae (Poaceae ? Aveneae)

Cited by 23 publications

References 41 publications

Cytogenetic studies in some representatives of the subfamily Pooideae (Poaceae) in South Africa. 1. The tribe Aveneae, subtribe Aveninae

Cytogenetic studies in some representatives of the subfamily Pooideae (Poaceae) in South Africa. 1. The tribe Aveneae, subtribe Aveninae

Chromosomal Differentiation of Deschampsia (Poaceae) Based on Four Satellite DNA Families

Holocene re‐colonisation, central–marginal distribution and habitat specialisation shape population genetic patterns within an Atlantic European grass species

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