Diversity and biogeography of Ni-hyperaccumulators of<i>Alyssum</i>section<i>Odontarrhena</i>(Brassicaceae) in the central western Mediterranean: evidence from karyology, morphology and DNA sequence data

Colzi, Ilaria; Coppi, Andrea; Gonnelli, Cristina; Selvi, Federico

doi:10.1111/boj.12084

Cited by 30 publications

(30 citation statements)

References 56 publications

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“…In this study, the existence of three clades (O1, O2 and O3, Fig. ) was supported by the ITS dataset, as well as the ropC1 data (Cecchi et al ), but not by the trnL‐F data.…”

Section: Discussionsupporting

confidence: 64%

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The phylogeny of Alyssum (Brassicaceae) inferred from molecular data

Feng

et al. 2015

Nordic Journal of Botany

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Previous molecular phylogenetic studies have contributed greatly to our knowledge about the phylogenetic position and infra‐generic relationships of the genus Alyssum. Nevertheless, due to limited sampling and incongruences between the different markers used, the phylogenetic relationships within the genus are still unresolved. In this study, the phylogenetic relationships within Alyssum were studied using nrDNA ITS and plastid trnL‐F sequences from 171 accessions representing 112 species from five sections of the genus. The phylogenetic analyses confirmed the paraphyly and recognition of two main clades in the genus. The first clade included the sections Alyssum, Gamosepalum and most species from sect. Psilonema. Alyssum lanigerum from sect. Odontarrhena was inferred to be nested in this clade only by the ITS dataset. The other clade contained the sections Meniocus, Odontarrhena and the genus Clypeola. The monophyly of the five sections defined by morphology was not well supported by molecular data. Species of the sections Gamosepalum and Psilonema (apart from A. homalocarpum) were intermixed with species of sect. Alyssum, and the monophyly of sect. Meniocus and the genus Clypeola were supported only by the trnL‐F dataset. Neither sect. Odontarrhena nor that of its three subsections, subsect. Inflata, Compressa and Samarifera, were recovered as monophyletic. The incongruence between morphology and molecular data indicates that the current taxonomic circumscription of the genus and sections need to be revised.

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“…In this study, the existence of three clades (O1, O2 and O3, Fig. ) was supported by the ITS dataset, as well as the ropC1 data (Cecchi et al ), but not by the trnL‐F data.…”

Section: Discussionsupporting

confidence: 64%

“…Odontarrhena (excluding A. lanigerum) was largely supported as monophyletic by both the ITS and trnL-F MP analyses. This section has also been found to be also supported as a monophyletic group by rpoC1 gene sequences (Cecchi et al 2013). Species of A. sect.…”

Section: Discussionmentioning

confidence: 90%

The phylogeny of Alyssum (Brassicaceae) inferred from molecular data

Feng

et al. 2015

Nordic Journal of Botany

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“…Furthermore, ploidy difference is likely to act as an additional isolating mechanism between some populations of this species. All the Iberian populations analysed in this study are diploid, with n = 8 (Fernandes and Queirós, 1973;Küpfer, 1974;Cecchi et al, 2013), but both diploid n = 8 (Küpfer, 1974) and tetraploid n = 16 (Bonnet, 1963;Puech, 1963) populations have been reported in France. All these factors may contribute to gradual divergence between individual populations, and the plants from different populations show some morphological differences.…”

Section: Evolution Of Nickel Hyperaccumulation In Genus Alyssummentioning

confidence: 77%

“…This has led to earlier proposals to raise the serpentine populations of A. serpyllifolium to the status of distinct subspecies, or even separate species (Dudley, 1986a and b,). However, analyses based on chloroplast DNA sequences have been unable to establish clearly resolved relationships between the different A. serpyllifolium populations (Cecchi et al, 2013;Flynn, 2013). In this paper, we have therefore reinvestigated the relationships between serpentine and nonserpentine populations of A. serpyllifolium using population-genetic approaches.…”

Section: Evolution Of Nickel Hyperaccumulation In Genus Alyssummentioning

confidence: 99%

Evolution of nickel hyperaccumulation and serpentine adaptation in the Alyssum serpyllifolium species complex

et al. 2016

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Metal hyperaccumulation is an uncommon but highly distinctive adaptation found in certain plants that can grow on metalliferous soils. Here we review what is known about evolution of metal hyperaccumulation in plants and describe a population-genetic analysis of the Alyssum serpyllifolium (Brassicaceae) species complex that includes populations of nickelhyperaccumulating as well as non-accumulating plants growing on serpentine (S) and non-serpentine (NS) soils, respectively. To test whether the S and NS populations belong to the same or separate closely related species, we analysed genetic variation within and between four S and four NS populations from across the Iberian peninsula. Based on microsatellites, genetic variation was similar in S and NS populations (average H o = 0.48). The populations were significantly differentiated from each other (overall F ST = 0.23), and the degree of differentiation between S and NS populations was similar to that within these two groups. However, high S versus NS differentiation was observed in DNA polymorphism of two genes putatively involved in adaptation to serpentine environments, IREG1 and NRAMP4, whereas no such differentiation was found in a gene (ASIL1) not expected to play a specific role in ecological adaptation in A. serpyllifolium. These results indicate that S and NS populations belong to the same species and that nickel hyperaccumulation in A. serpyllifolium appears to represent a case of adaptation to growth on serpentine soils. Further functional and evolutionary genetic work in this system has the potential to significantly advance our understanding of the evolution of metal hyperaccumulation in plants.

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“…In general, the populations in the present study were clustered similarly by the genetic and morphological analyses, with the exception of the populations from MC, CG, and CR. Other studies comparing genetic and morphological variations have reported contrasting results (Kjaer et al ., ; Hatziskakis, Tsiripidis & Papageorgiou, ; Cecchi et al ., ): in a regional analysis of sago palm ( Metroxylon sagu Rottb. ), Kjaer et al .…”

Section: Discussionmentioning

confidence: 99%

Genetic and morphologic diversity of European fan palm (Chamaerops humilisL.) populations from different environments from Sicily

et al. 2014

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Chamaerops humilis is decreasing in abundance in Mediterranean Europe, which has induced the European community to call for its protection in Special Areas of Conservation. However, information about its genetic and morphological variability, which is crucial to the development of any conservation strategies, is insufficient. The present study aimed to investigate the genetic and morphological variability of C. humilis in Sicily, which was selected as a model because of the high number of dense populations. The relationships between morphological traits and climatic variables were studied to highlight patterns of adaptation to the environment, along with the genetic similarity among the populations. Ten natural populations were sampled, analyzed using 28 specifically designed SSR primers, and evaluated based on 29 morphological traits. The populations were clustered similarly based on genetic and morphological traits. Heterozygosity was high and inbreeding coefficients were low. These results, along with higher intra- than inter-population differentiation, suggest that C. humilis populations in Sicily differentiated from a common ancestor and that inter-population variation arose from secondary evolution processes induced by ecological adaptation. The correlations between climatic variables and morphological traits suggest that the morphological adaptation to arid environments depends more on summer temperatures than on evapotranspiration or rainfall and that autumn and winter temperatures are determinants of the species establishment at new sites. Considering the response of C. humilis to seasonal temperatures, the present results indicate this species as a candidate for tracking climatic changes in Europe. Further studies are needed to highlight the adaptation of C. humilis to cold environments. Palaeo-climatological and -ecological studies could help clarify its strategies for the colonization of new sites

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Diversity and biogeography of Ni-hyperaccumulators ofAlyssumsectionOdontarrhena(Brassicaceae) in the central western Mediterranean: evidence from karyology, morphology and DNA sequence data

Cited by 30 publications

References 56 publications

The phylogeny of Alyssum (Brassicaceae) inferred from molecular data

The phylogeny of Alyssum (Brassicaceae) inferred from molecular data

Evolution of nickel hyperaccumulation and serpentine adaptation in the Alyssum serpyllifolium species complex

Genetic and morphologic diversity of European fan palm (Chamaerops humilisL.) populations from different environments from Sicily

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