Il complesso di Biscutella laevigata L. (Cruciferae) in Italia

Raffaelli, Mauro; Baldoin, Lucilla

doi:10.1080/00837792.1997.10670634

Cited by 10 publications

(7 citation statements)

References 1 publication

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“…(2002), the lowland varia taxon seems to be genetically depauperate. Biscutella prealpina (Raffaelli & Baldoin 1997), on the other hand, presented three unrelated haplotypes out of three samples. Haplotype PRE1 was close to lineage D, while PRE2 and PRE3 were close to haplotype VARIA and connected to several Western Alps haplotypes (Fig.…”

Section: Discussionmentioning

confidence: 99%

“…Biscutella laevigata ssp. lucida is a widely accepted glabrous tetraploid subspecies (Raffaelli 1992; Raffaelli & Baldoin 1997), but its taxonomical status based on hairiness appears to be controversial. As Fig.…”

Section: Discussionmentioning

confidence: 99%

“…Tremetsberger et al . (2002) also pointed out that a diploid taxon recently described by Raffaelli & Baldoin (1997) in the south of the Alps ( B. prealpina ) is more closely related to tetraploids than any other diploid group. From the range-wide study of Tremetsberger et al .…”

Section: Polyploidy and Glaciationsmentioning

confidence: 97%

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Glacialin situsurvival in the Western Alps and polytopic autopolyploidy inBiscutella laevigataL. (Brassicaceae)

2007

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Past climatic changes and especially the ice ages have had a great impact on both the distribution and the genetic composition of plant populations, but whether they promoted speciation is still controversial. The autopolyploid complex Biscutella laevigata is a classical example of polyploidy linked to glaciations and is an interesting model to explore migration and speciation driven by climate changes in a complex alpine landscape. Diploid taxa survived the last glacial maximum in several never-glaciated areas and autotetraploids are clearly dominant in the central parts of the Alps; however, previous range-wide studies failed to identify their diploid ancestor(s). This study highlights the phylogeographical relationships of maternal lineages in the Western Alps and investigates the polyploidy process using plastid DNA sequences (trnS-trnG and trnK-intron) combined with plastid DNA length polymorphism markers, which were transferable among Brassicaceae species. Twenty-one distinct plastid DNA haplotypes were distinguished in 67 populations densely sampled in the Western Alps and main lineages were identified by a median-joining network. The external Alps harboured high levels of genetic diversity, while the Central Alps contained only a subset of haplotypes due to postglacial recolonization. Several haplotypes were restricted to local peripheral refugia and evidence of in situ survival in central nunataks was detected by the presence of highly differentiated haplotypes swamped by frequent ones. As hierarchical genetic structure pointed to an independent evolution of the species in different biogeographical districts, and since tetraploids displayed haplotypes belonging to different lineages restricted to either the northern or the southern parts of the Alpine chain, polytopic autopolyploidy was also apparent in the Western Alps.

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Section: Discussionmentioning

confidence: 99%

Section: Discussionmentioning

confidence: 99%

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Glacialin situsurvival in the Western Alps and polytopic autopolyploidy inBiscutella laevigataL. (Brassicaceae)

2007

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“…The young Buckler Mustard autopolyploid complex ( Biscutella laevigata; Brassicaceae) thus represents a good model system to address the underpinnings of TE dynamics in such polyploids having originated within a single species (Manton, ). This textbook example includes diploid relict lineages in never glaciated areas of central Europe that hybridized and generated independent autotetraploid lineages having recolonized the Alps after the last glacial maximum (Stebbins, ; Raffaelli and Baldoin, ; Tremetsberger et al ., ; Parisod and Besnard, ). Accordingly, the diploids (2n = 2x = 18) B. laevigata subsp .…”

Section: Introductionmentioning

confidence: 99%

Evolutionary dynamics of retrotransposons following autopolyploidy in the Buckler Mustard species complex

2015

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SUMMARYLong terminal repeat retrotransposons (LTR-RTs) represent a major fraction of plant genomes, but processes leading to transposition bursts remain elusive. Polyploidy expectedly leads to LTR-RT proliferation, as the merging of divergent diploids provokes a genome shock activating LTR-RTs and/or genetic redundancy supports the accumulation of active LTR-RTs through relaxation of selective constraints. Available evidence supports interspecific hybridization as the main trigger of genome dynamics, but few studies have addressed the consequences of intraspecific polyploidy (i.e. autopolyploidy), where the genome shock is expectedly minimized. The dynamics of LTR-RTs was thus here evaluated through low coverage 454 sequencing of three closely related diploid progenitors and three independent autotetraploids from the young Biscutella laevigata species complex. Genomes from this early diverging Brassicaceae lineage presented a minimum of 40% repeats and a large diversity of transposable elements. Differential abundances and patterns of sequence divergence among genomes for 37 LTR-RT families revealed contrasted dynamics during species diversification. Quiescent LTR-RT families with limited genetic variation among genomes were distinguished from active families (37.8%) having proliferated in specific taxa. Specific families proliferated in autopolyploids only, but most transpositionally active families in polyploids were also differentiated among diploids. Low expression levels of transpositionally active LTR-RT families in autopolyploids further supported that genome shock and redundancy are non-mutually exclusive triggers of LTR-RT proliferation. Although reputed stable, autopolyploid genomes show LTR-RT fractions presenting analogies with polyploids between widely divergent genomes.

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“…Series Laevigatae therefore comprises woody or subwoody herbs, characterized by petals truncate and auriculate at the base, stamina1 filaments not winged, all nectaries extrastaminal and fruits with a membranaceous margin. Taxa belonging to this series are morphologically highly diversified and several names have been recently proposed for discrete entities, mainly from the western Mediterranean basin (Crespo, Guemes & Mateo, 1992;Mateo & Crespo, 1993;Raffaelli & Fiesoli, 1993;Raffaelli & Baldani, 1997). Since the initial record of B.fiutescens Coss.…”

Section: Introductionmentioning

confidence: 99%

A new Biscutella (Brassicaceae) species from the western Balearic Islands

Rosselló

Torres

Sáez

1999

Botanical Journal of the Linnean Society

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A new diploid species, Biscutella ebusitana is described from coastal cliffs of the western Balearic islands. It is related to B. senpm'rim L. and B. inontana Cav. from which it ran be distinguished by a combination of vegetative (shape, size, petiole and hairs of leaves, petiolatc leaves) and reproductive features (shape of inflorescence, calyx indunient). Earlier Balearir records of B. fmtescais Coss. should be referred to B. ebusitana. 0 1999 l l i e Linnean Sorirtv of Londrm

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Il complesso di Biscutella laevigata L. (Cruciferae) in Italia

Cited by 10 publications

References 1 publication

Glacialin situsurvival in the Western Alps and polytopic autopolyploidy inBiscutella laevigataL. (Brassicaceae)

Glacialin situsurvival in the Western Alps and polytopic autopolyploidy inBiscutella laevigataL. (Brassicaceae)

Evolutionary dynamics of retrotransposons following autopolyploidy in the Buckler Mustard species complex

A new Biscutella (Brassicaceae) species from the western Balearic Islands

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