Antioxidant protection during ageing and senescence in chloroplasts of tobacco with modulated life span
Jazyk angličtina Země Anglie, Velká Británie Médium print
Typ dokumentu srovnávací studie, časopisecké články, práce podpořená grantem
PubMed
18512255
DOI
10.1002/cbf.1481
Knihovny.cz E-zdroje
- MeSH
- antioxidancia fyziologie MeSH
- časové faktory MeSH
- chloroplasty metabolismus MeSH
- cytokininy biosyntéza MeSH
- geneticky modifikované rostliny cytologie genetika fyziologie MeSH
- listy rostlin metabolismus MeSH
- stárnutí buněk fyziologie MeSH
- tabák cytologie genetika metabolismus fyziologie MeSH
- Publikační typ
- časopisecké články MeSH
- práce podpořená grantem MeSH
- srovnávací studie MeSH
- Názvy látek
- antioxidancia MeSH
- cytokininy MeSH
We studied changes in antioxidant protection during ageing and senescence in chloroplasts of tobacco (Nicotiana tabacum L., cv. Wisconsin) with introduced SAG(12) promoter fused with ipt gene for cytokinin synthesis (transgenic plants with increased levels of cytokinins, SAG) or without it (control). Old leaves of SAG plants as well as their chloroplasts maintained higher physiological parameters compared to controls; accordingly, we concluded that their ageing was diverted due to increased cytokinin content. The chloroplast antioxidant protection did not decrease as well. Although antioxidant protection usually decreased in whole leaves of senescing control plants, ascorbate peroxidase (APX) and dehydroascorbate reductase (DHAR) activity, which maintained the high redox state of ascorbate, increased in chloroplasts of old control leaves.
Citace poskytuje Crossref.org
Role of Cytokinins in Senescence, Antioxidant Defence and Photosynthesis
