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1

Role of glutathione and glutathione S-transferase in lead tolerance and bioaccumulation by Dodonaea viscosa (L.) Jacq

100%
Rojas-Loria C. C., Favela-Torres E., Gonzales-Marquez H., Volke-Sepulveda T. L.
Acta Physiologiae Plantarum
|
2014
|
tom 36
|
nr 09
Glutathione (GSH) plays a central role in the plant tolerance against the toxic effects of metals. It is a key antioxidant and acts as a cofactor for glutathione S-transferase (GST). The main objective of this study was to determine the Pb tolerance and bioaccumulation by Dodonaea viscosa (L.) Jacq. and their relation to GSH production and GST activity. The relationship between the Pb tolerance and bioaccumulation by D. viscosa and the effect of the exposure time on the GSH production or the GST activity was assessed in trials with perlite under different Pb treatments. D. viscosa showed a remarkable tolerance to Pb [half-inhibitory concentration (IC₅₀) = 2,797 mg kg⁻¹] and accumulated up to 11,428 mg Pb kg⁻¹ in dry roots with a limited translocation to shoots without any signs of phytotoxicity after 105 days of exposure. The stress caused by the fast Pb uptake rate (489 mg kg⁻¹ day⁻¹) during the first 10 days of exposure was strongly correlated to increased GSH contents (~1.3-fold) and GST activities (~3.6-fold) in both shoots and roots. The results indicate that the Pb stress triggered a defense mechanism that involved increased contents of GSH and GST activities, suggesting that both variables are involved in the tolerance of D. viscosa against Pb toxicity.
2

Lead tolerance and the interactive effects of lead and IAA on direct root regeneration in the sunflower

100%
Strubinska J., Sniezko R.
Cellular and Molecular Biology Letters
|
2002
|
tom 07
|
nr Suppl.
3

Does wounding increase Pb-tolerance in sunflower seed lings? - Study of antioxidant response in primary and adventitious root systems

84%
Strubinska J., Mroczek M.
Acta Physiologiae Plantarum
|
2007
|
tom 29
|
nr 1 Suppl.
4
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In vitro selection for lead tolerance in shoot culture of Daphne species

67%
Wiszniewska A., Hanus-Fajerska E., Smolen S., Muszynska E.
Acta Scientiarum Polonorum. Hortorum Cultus
|
2015
|
tom 14
|
nr 1
In vitro culture may provide a suitable environment for selection of heavy-metal tolerant plantlets. Such clones of woody plants could be valuable material applicable to soil remediation. In in vitro culture conditions shoots of Daphne jasminea Sibth. & Sm. and Daphne tangutica Maxim. (Thymelaeaceae) were grown on media supplemented with 0.1, 0.5 and 1.0 mM lead nitrate. Level of lead bioaccumulation, growth parameters, content of photosynthetic pigments, and mineral status of cultured shoots were investigated. D. jasminea has grown vigorously on Pb2+-containing media, with growth tolerance index reaching 73–89%, depending on concentration applied, and the highest growth value was obtained in the presence of 1.0 mM lead nitrate. In vitro propagation of D. tangutica shoots was slightly inhibited by lead ions, however the growth tolerance index has increased up to 152% on medium with 1.0 mM Pb(NO3)2. In both studied species the highest content of accumulated lead, as well as the value of bioconcentration factor, were found in shoots grown on 0.1 mM lead nitrate. D. tangutica accumulated over two times as much lead in comparison with D. jasminea. Chlorophyll content in D. jasminea was not affected by applied lead nitrate doses, while in D. tangutica stimulation of chlorophyll, as well as carotenoid, synthesis occurred. In tested concentrations lead nitrate had no toxic effect on the level of shoot nutrition. Detected levels of essential and trace elements were still high enough to maintain undisturbed growth and development of cultured shoots. This is first report confirming the suitability of in vitro selection for obtaining of vigorous, proliferative, tolerant to elevated lead concentration shoots of ornamental Daphne species.
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