Publication detail

Serpentine ecotypic differentiation in a polyploid plant complex: shared tolerance to Mg and Ni stress among di- and tetraploid serpentine populations of Knautia arvensis (Dipsacaceae)

Year: 2014

Type of publication: článek v odborném periodiku

Name of source: Plant and Soil

Publisher name: Kluwer Academic Publishers

Place: Dordrecht

Page from-to: 435-447

Titles:

Language	Name	Abstract	Keywords
cze	Ekotipická diferenciace polyploidních rostlinných společenstev na hadcových půdách: sdílená tolerance vůči Mg a Ni u di- a tetraploidních hadcových populací Knautia arvensis (Dipsacaceae)	Hadcové půdy limitují růst rostlinných společenstev a jejich přežívání a představují proto ideální model pro studium adaptačních mechanismů rostlin na environmentální stresové faktory. Předložená práce se zabývá tolerancí di- a tetraploidních společenstev Knautia arvensis (Dipsacaceae) rostoucích na hadcových půdách vůči Mg a Ni.	Knautia; arvensis; Mg; Ni; tolerance; diploidní; tetraploidní; hadce
eng	Serpentine ecotypic differentiation in a polyploid plant complex: shared tolerance to Mg and Ni stress among di- and tetraploid serpentine populations of Knautia arvensis (Dipsacaceae)	Serpentine soils impose limits on plant growth and survival and thus provide an ideal model for studying plant adaptation under environmental stress. Despite the increasing amount of data on serpentine ecotypic differentiation, no study has assessed the potential role of polyploidy. We tested for links between polyploidy and the response to serpentine stress in Knautia arvensis, a diploid-tetraploid, edaphically differentiated complex. Variation in growth, biomass yield and tissue Mg and Ni accumulation in response to high Mg and Ni concentrations were experimentally tested using hydroponic cultivation of seedlings from eight populations of different ploidy and edaphic origin. Regardless of ploidy level, serpentine populations exhibited higher tolerance to both Mg and Ni stress than their non-serpentine counterparts, suggesting an adaptive character of these traits in K. arvensis. The effect of ploidy was rather weak and confined to a slightly better response of serpentine tetraploids to Mg stress and to higher biomass yields in tetraploids from both soil types. The similar response of diploid and tetraploid serpentine populations to edaphic stress corresponded with their previously described genetic proximity. This suggests that serpentine tolerance might have been transmitted during the local autopolyploid origin of serpentine tetraploids.	Adaptation; Ca/Mg ratio; Metal tolerance; Nickel; Ploidy level; Serpentine

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