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. 2003 Sep;159(3):691-699.
doi: 10.1046/j.1469-8137.2003.00837.x.

Evolutionary dynamics of nickel hyperaccumulation in Alyssum revealed by its nrDNA analysis

A Mengoni  1 , A J M Baker  2 , M Bazzicalupo  1 , R D Reeves  3 , N Adigüzel  4 , E Chianni  5 , F Galardi  5 , R Gabbrielli  5 , C Gonnelli  5
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Free article

Evolutionary dynamics of nickel hyperaccumulation in Alyssum revealed by its nrDNA analysis

A Mengoni et al. New Phytol. 2003 Sep.
Free article

Abstract

• Molecular phylogeny based on ribosomal internal transcribed spacer (ITS) sequences was studied to investigate the phyletic relationships among some nickel (Ni)-hyperaccumulating and nonhyperaccumulating species of the genus Alyssum in relation to their geographic distribution and Ni-hyperaccumulating phenotype. • Thirty-seven samples belonging to 32 taxa were analysed by sequencing the polymerase chain reaction-amplified ITS region and performing neighbor joining, maximum parsimony and maximum likelihood phylogenetic analyses. • The ITS region in the sampled species varied from 221 to 307 bp of ITS1 and from 194 to 251 bp of ITS2. A total of 765 characters was used to infer the phylogeny and the average nucleotide variation detected was 15.15%. • Nickel-hyperaccumulation could have been lost or acquired independently more than once during the speciation of the genus. The geographical location of species could not be related to phylogenetic affinities.

Keywords: Alyssum; evolution; heavy metals; hyperaccumulation; internal transcribed spacers; molecular phylogeny; nickel.

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References

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