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Accumulation of metallothionein transcripts in response to iron, copper and zinc: metallothionein and metal-chelate reductase

100%

Fordham-Skelton A. P., Wilson J. R., Groom Q., Robinson N. J.

Acta Physiologiae Plantarum

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1997

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tom 19

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nr 4

It has been proposed that plant metallothionein (MT) sequesters excess copper, and possibly zinc, thereby preventing adverse metal-protein interactions. These metals can accumulate either gratuitously in response to other nutritional deficiencies or in plants grown in either copper- or zinc-enriched medium. Data are presented which confirm that in pea roots grown in low available iron there is increased (i) copper accumulation, (ii) MT transcript abundance, (iii) ferric-chelate reductase activity and (iv) cupric-chelate reductase activity. It is also shown that in roots grown in iron supplemented medium MT transcripts accumulate in response to elevated exogenous zinc. However, contrary to expectations, depletion of exogenous copper below normal micronutrient levels also confers an increase in the abundance of MT transcripts. The hypothesis that the products of plant metallothionein genes could act as copper chaperones is discussed.

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Determination of the tolerance of sunflower to lead-induced stress

84%

Winska-Krysiak M., Koropacka K., Gawronski S.

Journal of Elementology

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2015

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tom 20

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nr 2

Six-week old sunflower seedlings, cv. Ogrodowy, were treated with 0, 15, 45 and 60 mg Pb dm-3, and then the content of lead and selected physiological and biochemical parameters were measured. Photosynthesis efficiency, water relations (intensity of transpiration, relative water content (RWC)) and gene-encoding metallothionein were measured three times after 24, 48 and 72 hours of exposure to Pb. The content of glutathione and lead was analysed after 72 hours’ exposure to Pb. Most of the lead uptake was accumulated in the roots, then in the stems and leaves, but when re-calculated per plant dry weight, the uptake of the metal did not depend on the lead dose applied. The highest 60 mg Pb dm-3 treatment was accompanied by a significant decrease in dry weight content. Moreover, most of the lead taken up in these plants was transported to the stems and leaves (23.6% of total lead uptake). The lead doses used in this study did not affect the intensity of photosynthesis, but a decrease in transpiration and relative water content was observed. The glutathione level in the plants varied depending on the organ examined and the Pb concentration in the treatment. The expression of the metallothionein gene HaMT1 was observed in the stems only. These results indicate that the sunflower cultivar Ogrodowy is a promising plant for phytoremediation of lead-polluted soils.

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Plant metallothionein genes: structure, regulation and function in metal tolerance

84%

Goldsbrough P., Bundithya W., Orczyk W., Zhou J.

Biological Bulletin of Poznań. Supplement

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1997

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tom 34

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Molecular responses of plants to iron, copper and zinc: metallothionein and metal-chelate reductases

84%

Groom Q. J., Fordham-Skelton A. P., Sadjuga, Proctor C. M., Robinson N. J.

Biological Bulletin of Poznań. Supplement

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1997

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tom 34

Ograniczanie wyników

2 Biological Bulletin of Poznań. Supplement

1 Acta Physiologiae Plantarum

1 Journal of Elementology

2 Fordham-Skelton A. P.

2 Robinson N. J.

1 Bundithya W.

1 Gawronski S.

1 Goldsbrough P.

1 Groom Q.

1 Groom Q. J.

1 Koropacka K.

1 Orczyk W.

1 Proctor C. M.

1 Sadjuga

1 Wilson J. R.

1 Winska-Krysiak M.

1 Zhou J.

1 2015

3 1997

Accumulation of metallothionein transcripts in response to iron, copper and zinc: metallothionein and metal-chelate reductase

Determination of the tolerance of sunflower to lead-induced stress

Plant metallothionein genes: structure, regulation and function in metal tolerance

Molecular responses of plants to iron, copper and zinc: metallothionein and metal-chelate reductases