Nuclear DNA variation in diploid and polyploid taxa of Larrea (Zygophyllaceae)

Poggio, Lidia; Burghardt, Alicia Diana; Hunziker, Juan H.

doi:10.1038/hdy.1989.105

Cited by 40 publications

(20 citation statements)

References 17 publications

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“…No positive association can be made between the ploidy level and aridity as reported in other plants (e.g., STEBBINS 1985; POGGIO et al 1989;BARRETT and CASE 2006;ASHMAN 2007). However, polyploidy and gender dimorphism have evolved multiple times in concert within the genus (LEVIN et al 2007).…”

Section: Discussionmentioning

confidence: 92%

Karyotypes and ﬂuorescent chromosome banding patterns in southern AfricanLycium(Solanaceae)

et al. 2010

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-Chromosomal analyses of several southern African Lycium species resulted in diploid (2n=24: L. amoenum, L. bosciifolium, L. ferocissimum, L. oxycarpum, L. tenue), tetraploid (2n=48: L. gariepense, L. strandveldense, L. hantamense), and hexaploid (2n=72: L. tetrandrum) counts. Chromosomes in all species were short (mean length = 2.00 μm; mean haploid genome length = 23.77 μm). Further, all species shared a highly symmetrical karyotype formula with 10 m pairs and 2 sm pairs, except L. bosciifolium with only one sm pair. The fi rst m pair had a terminal microsatellite on the short arms. Fluorescent chromosome banding patterns with CMA/ DAPI staining in the diploid species showed NOR-associated heterochromatin in the fi rst satellited pair. The tetraploids L. gariepense and L. hantamense had two chromosome pairs with a CMA + /DAPI -terminal band. Phylogenetic studies have shown that the southern African species are included in a monophyletic group including all Old World Lycium; these species are likely of recent origin and, despite ploidy differences, karyotypes are remarkably similar among species. Available data for South American, Asian, and southern African Lycium indicate that there is a common pattern of mostly m chromosomes in which a few cryptic chromosomal rearrangements may have occurred, suggesting that karyotypic orthoselection has preserved similar patterns among species. Thus, these data imply that speciation in Lycium was not accompanied by changes in chromosomal morphology.

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Section: Discussionmentioning

confidence: 92%

Karyotypes and ﬂuorescent chromosome banding patterns in southern AfricanLycium(Solanaceae)

et al. 2010

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“…Cav. the ploidy level increases towards the west with a concomitant increase in aridity (HuN-ZIKER et al 1977, 1978POGGIO et al 1989). The increase of ecological diversity and the opening of new habitats for colonization of xeric areas, as a result of climatic change, provides an opportunity for polyploids to exhibit their adaptive abilities and as a contribution to the fight against deserts growth in patagonia.…”

Section: Discussionmentioning

confidence: 99%

Ploidy levels and their relationships with the rainfall in several populations of Patagonian species ofBerberisL

1999

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-The ploidy levels and pollen staining of 68 populations belonging to 13 species of the genus Berberis L., growing in the Argentinian Patagonia under different environmental conditions, were analyzed as a part of a multidisciplinary study to obtain information about the evolutionary history of the genus. The chromosome number at Berberis bidentata, B. cabrerae, B. chillanensis, B. darwinii, B. empetrifolia, B. ilicifolia, B. linearifolia, B. micro-phylla, B. montana, B. parodii and B. serrato-dentata is 2n = 28, whereas B. buxifolia and B. heterophylla have 2n -56. The relationship between ploidy levels and rainfall showed that, contrarily to the species with 2n = 28, B. buxifolia and B. heterophylla (2n =56) grow in areas where the rainfall range is low. The opening of new habitats for colonization as a result of climatic change provides an ecological opportunity for the polyploids to exploit their inherent advantage.

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“…For instance, it has been demonstrated that important ecological characteristics of plant species in natural habitats vary with genome size, e.g. timing of spring growth, cell size and rate of leaf expansion in early season growth (Grime et al, 1985), frost resistance (Macgillivray and Grime, 1995), xeric conditions (Poggio et al, 1989) and altitude .…”

Section: Introductionmentioning

confidence: 99%

Relationships among Genome Size, Environmental Conditions and Geographical Distribution in Natural Populations of NW Patagonian Species of Berberis L. (Berberidaceae)

Bottini

2000

Annals of Botany

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Variation in genome size of 24 populations belonging to 11 NW Patagonian species of Berberis was analysed as a function of the environment and geographical location. The variation showed three levels of discontinuity, two of which corresponded to diploid species (2n 28) while the third corresponded to polyploid species (2n 56). Diploids with DNA content ranging from 1 . 463 pg to 1 . 857 pg included Berberis cabrerae, B. chillanensis, B. montana, B. serrato-dentata and B. bidentata. Diploids with DNA content ranging from 2 . 875 pg to 3 . 806 pg included B. linearifolia, B. darwinii, B. parodii and B. empetrifolia. The genome size of the polyploid species B. buxifolia and B. heterophylla ranged from 5 . 809 pg to 6 . 844 pg. Principal component analysis (PCA) was applied to represent the variability of environmental conditions. The eigenvectors of the principal component axes showed that PC1 discriminates the populations according to rainfall, types of vegetation and geomorphology; altitude and latitude, on the other hand, contribute to PC2 and PC3, respectively. From these results it is concluded: (1) that diploids with lower DNA content grow in high-elevation sites having greater rainfall but lower water availability; (2) diploids with higher DNA content are associated with half-elevation forests where the vegetative period is longer, the water availability is greater and the temperatures are higher; and (3) the distribution pattern of polyploids is considerably wider than that of diploids, which are geographically and ecologically restricted to forest areas. These results suggest that the C-value plays an important role in the ability of the species to adapt to dierent growing conditions. # 2000 Annals of Botany Company

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Nuclear DNA variation in diploid and polyploid taxa of Larrea (Zygophyllaceae)

Cited by 40 publications

References 17 publications

Karyotypes and ﬂuorescent chromosome banding patterns in southern AfricanLycium(Solanaceae)

Karyotypes and ﬂuorescent chromosome banding patterns in southern AfricanLycium(Solanaceae)

Ploidy levels and their relationships with the rainfall in several populations of Patagonian species ofBerberisL

Relationships among Genome Size, Environmental Conditions and Geographical Distribution in Natural Populations of NW Patagonian Species of Berberis L. (Berberidaceae)

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