Photosynthetic Changes in the Inducible CAM Plant Sedum telephium L Following the Imposition of Water Stress. II. Changes in the Activity of Phosphoenolpyruvate Carboxylase |
| |
| Authors: | GROENHOF ANDREW C; BRYANT JOHN A; ETHERINGTON JOHN R |
| |
| Institution: | *Department of Biological Sciences, University of Exeter, Washington Singer Laboratories Perry Road, Exeter, EX4 4QG, UK
 Department of Plant Science, University College P.O. Box 78, Cardiff, CF1 1XL UK |
| |
| Abstract: | In Sedum telephium, the switch from a weak-CAM to a full-CAMmode of photosynthesis in response to water stress, is accompaniedby a marked increase in the activity of the enzyme phosphoenolpyruatecarboxylase (PEPC) during the dark period of a diurnal cycle.Fractionation of the enzyme by non-denaturing polyacrylamidegel electrophoresis gives two active species; the activity ofthe more mobile species increases with the switch into a full-CAMmode of photosynthesis. Fractionation of the enzyme by denaturing electrophoresis andby gel filtration indicates that the molecular species particularlyactive in CAM is a monomeric protein, whilst the other readilyobservable species is a dimer. Sedum telephium, CAM, water stress, phosphoenolpyruvate carboxylase, night-time activation dimer, monomer |
| |
| Keywords: | |
| 本文献已被 Oxford 等数据库收录！ |
|
