The long-term effect of zinc soil contamination on selected free amino acids playing an important role in plant adaptation to stress and senescence
Language English Country Netherlands Media print-electronic
Document type Journal Article, Research Support, Non-U.S. Gov't
PubMed
24238718
DOI
10.1016/j.ecoenv.2013.10.028
PII: S0147-6513(13)00471-5
Knihovny.cz E-resources
- Keywords
- Amino acid, Cytokinins, Plant, Senescence, Toxic element,
- MeSH
- Amino Acids analysis metabolism MeSH
- Time MeSH
- Cytokinins genetics metabolism MeSH
- Adaptation, Physiological drug effects MeSH
- Plants, Genetically Modified genetics metabolism MeSH
- Soil Pollutants toxicity MeSH
- Promoter Regions, Genetic MeSH
- Nicotiana genetics metabolism physiology MeSH
- Zinc toxicity MeSH
- Publication type
- Journal Article MeSH
- Research Support, Non-U.S. Gov't MeSH
- Names of Substances
- Amino Acids MeSH
- Cytokinins MeSH
- Soil Pollutants MeSH
- Zinc MeSH
Increased endogenous plant cytokinin (CK) content through transformation with an isopentyl transferase (ipt) gene has been associated with improved plant stress tolerance. The objective of this study is to determine amino acid changes associated with elevated CK production in ipt transgenic tobacco (Nicotiana tabacum L., cv. Wisconsin 38). Nontransformed (WT) and transformed tobacco plants with ipt gene controlled by senescence-activated promoter (SAG) were exposed to zinc soil contamination (tested levels Zn1=250, Zn2=500, Zn3=750 mg kg(-1) soil). The Zn effect on plant stress metabolism resulted in changes in levels of selected free amino acids playing an important role in adaptation to stress and plant senescence (alanine, leucine, proline, methionine and γ-aminobutyrate) and differed for transformed and nontransformed tobacco plants. Analyses of amino acids confirmed that SAG tobacco plants had improved zinc tolerance compared with the WT plants. The enhanced Zn tolerance of SAG plants was associated with the maintenance of accumulation of proline, methionine and γ-aminobutyrate. The concentrations of leucine and alanine did not show significant differences between plant lines.
References provided by Crossref.org
Response of cytokinins and nitrogen metabolism in the fronds of Pteris sp. under arsenic stress
