Copper toxicity and sulfur metabolism in Chinese cabbage
PhD ceremony: Mr. M. Shahbaz, 12.45 uur, Aula Academiegebouw, Broerstraat 5, Groningen
Dissertation: Copper toxicity and sulfur metabolism in Chinese cabbage
Promotor(s): prof. J.T.M. Elzenga
Faculty: Mathematics and Natural Sciences
Copper is an essential nutrient for plants, however, at enhanced concentrations in the root environment it may rapidly become phytotoxic. Muhammad Shahbaz has investigated the physiological basis of the phytotoxicity of Cu and significance of sulfur metabolism in its detoxification in Chinese cabbage. From his research it was evident that enhanced Cu2+ concentrations (> 2 μM) in the root environment are toxic for Chinese cabbage. The presence of UV radiation strongly enhanced Cu toxicity. Enhanced Cu2+ concentrations resulted in sulfate accumulation in the shoot and an enhanced synthesis of other sulfur-rich compounds (viz. phytochelatins and glutathione) in the root. Enhanced Cu2+ concentrations interfered with the regulation of the uptake and assimilation of sulfur in Chinese cabbage, but there was no direct relation between the plant sulfur status and Cu toxicity. It is generally presumed that sulfate itself or metabolic products of the sulfate assimilation, viz. thiols (glutathione), would act as signals in the regulation of the expression and activity of the sulfate transporters. This presumed signal transduction pathway in regulation of expression and activity of the sulfate transporters (sulfate and thiols) were by-passed or overruled, if Chinese cabbage was exposed to enhanced Cu2+ concentrations. It is proposed that undissociated H2S may function as an endogenous gaseous transmitter in the cross-talk between the sulfate reduction pathway in chloroplast/plastid and the transcription of sulfate transporters in the nucleus. A Cu-induced decrease in subcellular H2S concentration might be responsible for the observed upregulation of the expression and activity of the sulfate transporters.
Last modified: | 13 March 2020 01.12 a.m. |
More news
-
10 July 2025
Dutch Research Agenda funding for nanomedicine research
Prof Dr Anna Salvati, Dr Christoffer Åberg and Prof Dr Siewert-Jan Marrink have been granted a National Science Agenda (NWA) funding to further develop life-saving drugs based on nanotechnology with the NanoMedNL consortium.
-
07 July 2025
Master’s student Industrial Engineering and Management Ana Lazar wins GUF 100 Prize
At the UG Ceremony of Merits on July 4, Ana Lazar was awarded the GUF 100 Prize, making her the best student of the Faculty of Science and Engineering 2024-2025.
-
04 July 2025
University of Groningen awards various prizes during Ceremony of Merits
The UG awarded different prizes to excellent researchers and students during the Ceremony of Merits on 4 July 2025.