| Autor: |
Khan, Nafees A., Singh, Sarvajeet, Umar, Shahid, Zechmann, B., Müller, M., Zellnig, G. |
| Zdroj: |
Sulfur Assimilation & Abiotic Stress in Plants; 2008, p193-206, 14p |
| Abstrakt: |
Cysteine, the initial product of sulfate assimilation, is supposed to be the rate-limiting factor for glutathione ( γ-glutamyl-cysteinyl-glycine) synthesis in nonstressed plants. In plants the assimilation of sulfate to sulfi de exclusively takes place in plastids, whereas the synthesis of cysteine is carried out in plastids as well as in mitochondria and the cytosol. Glutathione synthesis, on the other hand, is thought to take place in plastids and the cytosol. Considering the above described pathways, the availability of cysteine, especially in plastids and/or cytosol, is essential for glutathione synthesis. Glutathione degradation into its constituents is thought to take place at the plasmalemma, the tonoplast, and within vacuoles and the apoplast. In this chapter we describe how the artifi cial elevation of cysteine in Cucurbita pepo (L.) plants by L-2-oxothiazolidine-4-carboxylic acid (OTC) changes glutathione and its precursor contents in single cells and organelles, thus giving a deeper insight into glutathione synthesis and degradation on the cellular level. [ABSTRACT FROM AUTHOR] |
| Databáze: |
Supplemental Index |
| Externí odkaz: |
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