NDLI: Possible mechanism of iron deficit development in Mimulus guttatus plants exposed to joint action of nickel and zinc salts

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Possible mechanism of iron deficit development in Mimulus guttatus plants exposed to joint action of nickel and zinc salts

Content Provider	Springer Nature Link
Author	Bashmakova, E. B. Pashkovskiy, P. P. Radyukina, N. L. Kuznetsov, Vl. V.
Copyright Year	2015
Abstract	Possible reasons for development of iron deficiency were investigated in the plants of Mimulus guttatus Fischer ex DC exposed to separate or joint action of NiSO$_{4}$ (20 and 80 μM) and ZnSO$_{4}$ (50, 100, and 200 μM). Six-week-old plants were grown during the next 28 days under controlled-climate conditions in water culture on a modified Rorison’s medium supplemented with or without NiSO$_{4}$ and/or ZnSO$_{4}$. It was found that the plants of M. guttatus are very tolerant to joint action of nickel and zinc sulfates. We revealed an antagonism between Ni$^{2+}$ and Zn$^{2+}$ in the course of uptake by the roots: Zn2+ impeded Ni2+ uptake by the roots even if concentration of Zn$^{2+}$ in the medium was 1.6 times lower than the concentration of Ni$^{2+}$, whereas Ni$^{2+}$ inhibited uptake of Zn$^{2+}$ by the roots if concentration of Ni$^{2+}$ in the medium was 1.6 times higher than the level of Zn$^{2+}$. The nickel did not affect zinc translocation to the aboveground organs, whereas zinc boosted translocation of nickel from the roots to the leaves. We showed a strong reverse correlation between the content of iron and total content of zinc and nickel in the leaves and a reverse correlation between translocation of iron and nickel. Assay of iron and determination of Fe(III)-chelate reductase activity in the roots showed that development of iron deficit in plants exposed to NiSO$_{4}$ and ZnSO4 was not associated with inhibition by Ni$^{2+}$ and Zn$^{2+}$ of Fe$^{2+}$ uptake by the roots. It was found that the plants responded to exposure to 50–200 μM ZnSO$_{4}$ with a manifold rise in the content of free nicotianamine (NA) in the root system, whereas when culture medium was supplemented with 20 or 80 μM NiSO$_{4}$ in addition to ZnSO$_{4}$, the level of free NA in the roots became at least three times lower relative to the content of free NA in the roots exposed to ZnSO$_{4}$ alone. Finally, we revealed a direct correlation between the content of free NA and accumulation of nickel in plant leaves. The data suggest that development of iron deficit in the plants of M. guttatus exposed to joint influence of nickel and zinc sulfates depends on the competition between Ni$^{2+}$ and Fe$^{2+}$/Fe$^{3+}$ for a chelating agent (probably, NA).
Starting Page	761
Ending Page	771
Page Count	11
File Format	PDF
ISSN	10214437
Journal	Russian Journal of Plant Physiology
Volume Number	62
Issue Number	6
e-ISSN	16083407
Language	English
Publisher	Pleiades Publishing
Publisher Date	2015-10-18
Publisher Place	Moscow
Access Restriction	One Nation One Subscription (ONOS)
Subject Keyword	Mimulus guttatus heavy metals tolerance nickel/zinc antagonism iron deficit Fe(III)-chelate reductase nicotianamine histochemical methods Plant Physiology Plant Sciences
Content Type	Text
Resource Type	Article
Subject	Plant Science

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