Abstract
In this work, a comparative analysis of zinc (Zn) accumulation by the excluder Microthlaspi perfoliatum (L.) F.K. Mey, the hyperaccumulator Noccaea japonicum (H. Boissieu) F.K. Mey from ultramafic (serpentine) soil and plants from 19 populations of the hyperaccumulator Noccaea caerulescens F.K. Mey originating from ultramafic, calamine and non-metalliferous soils was carried out. The seedlings were grown for 2 weeks on half-strength Hoagland’s solution at 2 μM ZnSO4, followed by incubation for 6 weeks at 5 μM ZnSO4 (these Zn concentrations were non-toxic for all the populations of all species). The Zn concentration in the roots and shoots was determined by atomic absorption spectrophotometry. In M. perfoliatum, the Zn concentration in the roots was significantly higher than in the shoots, whereas in the hyperaccumulators, N. japonicum and N. caerulescens, the Zn concentrations in both organs were in most cases similar or higher in the shoots. Within N. caerulescens the greatest differences in Zn accumulation in roots and shoots were found among the calamine populations whereas the smallest differences were found among the ultramafic populations. Zn accumulation in roots per unit dry weight decreased in the following order: Les Avinières ≈ St-Baudille ≈ Viviez ≈ Le Coulet ≈ Le Puy de Wolf > Cira > Puente Basadre > Moravskoslezské ≈ Monte Prinzera > St‑Fé-lix-de-Pallières ≈ Prémanon > La Calamine > Le Bleymard > Krušné Hory ≈ Kuopio > Prayon > Wilwerwiltz ≈ Jean Arsac ≈ Plombières. The value of the translocation factor (TF) was the lowest in the excluder M. perfoliatum. In N. japonicum, TF did not significantly differ from the ultramafic populations of N. caerulescens. Among populations of N. caerulescens, the mean TF values varied to a large extent. The highest TF value (5.83) was obtained for Prayon and the lowest value (0.37) for Les Avinières, both belonging to the calamine ecotype. No correlation was found between the Zn concentration in the roots and the Zn concentration in the shoots in N. caerulescens. A significant negative correlation was found between the Zn accumulation in the roots and plant Zn tolerance estimated by the root growth test, which indicates that root Zn tolerance in N. caerulescens might depend, to some extent, on the capacity to restrict the accumulation of Zn in the root, mainly through restricting its uptake into the root. The difference in root Zn tolerance between the calamine and non-metallicolous ecotypes seems to be largely explained by an enhanced Zn sequestration capacity in the calamine ecotype, compared to the non-metallicolous one.
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Claims 15
Claim · model-written summary
In M. perfoliatum the root Zn concentration was significantly higher than the shoot concentration.
- Taxon
- M. perfoliatum
Microthlaspi perfoliatume1 - Organ / stage
- rootse1
- Outcome
- Zn concentration in the rootse1
- Direction
- highere1
- Comparator
- the shootse1
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e1“In M. perfoliatum, the Zn concentration in the roots was significantly higher than in the shoots”
Claim · model-written summary
In N. japonicum, Zn concentrations in both organs were in most cases similar or higher in the shoots.
Verbatim
e2“in the hyperaccumulators, N. japonicum and N. caerulescens, the Zn concentrations in both organs were in most cases similar or higher in the shoots”
Claim · model-written summary
In N. caerulescens, Zn concentrations in both organs were in most cases similar or higher in the shoots.
- Taxon
- N. caerulescens
Noccaea caerulescense2 - Organ / stage
- shootse2
- Outcome
- Zn concentrations in both organse2
- Direction
- similar or highere2
- Qualifier
- in most casese2
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e2“in the hyperaccumulators, N. japonicum and N. caerulescens, the Zn concentrations in both organs were in most cases similar or higher in the shoots”
Claim · model-written summary
Within N. caerulescens, the greatest root and shoot differences in Zn accumulation were found among the calamine populations.
- Taxon
- N. caerulescensNoccaea caerulescense3
- Material
- calamine populationse3
- Outcome
- differences in Zn accumulation in roots and shootse3
- Direction
- greateste3
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e3“Within N. caerulescens the greatest differences in Zn accumulation in roots and shoots were found among the calamine populations whereas the smallest differences were found among the ultramafic populations”
Claim · model-written summary
Within N. caerulescens, the smallest root and shoot differences in Zn accumulation were found among the ultramafic populations.
- Taxon
- N. caerulescensNoccaea caerulescense3
- Material
- ultramafic populationse3
- Outcome
- differences in Zn accumulation in roots and shootse3
- Direction
- smalleste3
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e3“Within N. caerulescens the greatest differences in Zn accumulation in roots and shoots were found among the calamine populations whereas the smallest differences were found among the ultramafic populations”
Claim · model-written summary
Root Zn accumulation per unit dry weight decreased across the 19 N. caerulescens populations in the order given in the abstract.
- Taxon
- Noccaea caerulescensNoccaea caerulescense5
- Organ / stage
- rootse4
- Outcome
- Zn accumulation in roots per unit dry weighte4
- Direction
- decreasede4
- Qualifier
- in the following ordere4
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e4“Zn accumulation in roots per unit dry weight decreased in the following order”
e5“plants from 19 populations of the hyperaccumulator Noccaea caerulescens F.K. Mey”
Claim · model-written summary
In M. perfoliatum the translocation factor was the lowest of the species compared.
- Taxon
- M. perfoliatumMicrothlaspi perfoliatume6
- Outcome
- translocation factor (TF)e6
- Direction
- loweste6
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e6“The value of the translocation factor (TF) was the lowest in the excluder M. perfoliatum”
Claim · model-written summary
In N. japonicum the translocation factor did not significantly differ from the ultramafic populations of N. caerulescens.
Verbatim
e7“In N. japonicum, TF did not significantly differ from the ultramafic populations of N. caerulescens”
Claim · model-written summary
Among N. caerulescens populations the mean translocation factor values varied to a large extent.
- Taxon
- N. caerulescensNoccaea caerulescense0
- Outcome
- mean TF valuese0
- Qualifier
- varied to a large extente0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Among populations of N. caerulescens, the mean TF values varied to a large extent”
Claim · model-written summary
The highest translocation factor (5.83) was obtained for the Prayon population of N. caerulescens.
- Taxon
- N. caerulescensNoccaea caerulescense0
- Material
- Prayone1
- Outcome
- TF valuee1
- Direction
- higheste1
- Value
- 5.83e1
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Among populations of N. caerulescens, the mean TF values varied to a large extent”
e1“The highest TF value (5.83) was obtained for Prayon and the lowest value (0.37) for Les Avinières”
Claim · model-written summary
The lowest translocation factor (0.37) was obtained for the Les Avinières population of N. caerulescens.
- Taxon
- N. caerulescensNoccaea caerulescense0
- Material
- Les Avinièrese1
- Outcome
- TF valuee1
- Direction
- loweste1
- Value
- 0.37e1
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Among populations of N. caerulescens, the mean TF values varied to a large extent”
e1“The highest TF value (5.83) was obtained for Prayon and the lowest value (0.37) for Les Avinières”
Claim · model-written summary
No correlation was found between Zn concentrations in the roots and in the shoots of N. caerulescens.
- Taxon
- N. caerulescensNoccaea caerulescense0
- Organ / stage
- rootse0
- Outcome
- correlatione0
- Direction
- No correlatione0
- Qualifier
- between the Zn concentration in the roots and the Zn concentration in the shootse0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“No correlation was found between the Zn concentration in the roots and the Zn concentration in the shoots in N. caerulescens”
Claim · model-written summary
A significant negative correlation was found between root Zn accumulation and plant Zn tolerance in N. caerulescens, estimated by the root growth test.
- Taxon
- N. caerulescensNoccaea caerulescense0
- Organ / stage
- rootse1
- Outcome
- plant Zn tolerancee1
- Direction
- negativee1
- Qualifier
- estimated by the root growth teste1
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“No correlation was found between the Zn concentration in the roots and the Zn concentration in the shoots in N. caerulescens”
e1“A significant negative correlation was found between the Zn accumulation in the roots and plant Zn tolerance estimated by the root growth test”
Claim · model-written summary
Root Zn tolerance in N. caerulescens might depend on the capacity to restrict Zn accumulation in the root, mainly through restricted uptake.
- Taxon
- N. caerulescensNoccaea caerulescense0
- Outcome
- root Zn tolerancee0
- Qualifier
- might depend, to some extent, on the capacity to restrict the accumulation of Zn in the roote0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“which indicates that root Zn tolerance in N. caerulescens might depend, to some extent, on the capacity to restrict the accumulation of Zn in the root”
Claim · model-written summary
The root Zn tolerance difference between calamine and non-metallicolous Noccaea caerulescens ecotypes seems largely explained by enhanced Zn sequestration in the calamine ecotype.
- Taxon
- Noccaea caerulescensNoccaea caerulescenst0
- Outcome
- difference in root Zn tolerance between the calamine and non-metallicolous ecotypese1
- Qualifier
- an enhanced Zn sequestration capacity in the calamine ecotypee1
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
t0“Noccaea caerulescens”
e1“The difference in root Zn tolerance between the calamine and non-metallicolous ecotypes seems to be largely explained by an enhanced Zn sequestration capacity in the calamine ecotype”