Exposure of 10-d-old spinach (Spinacea oleracea L.) plants to excess (500 μM) concentrations of Co, Ni, Cu, Zn and Cd in sand culture inhibited growth, induced toxicity symptoms, oxidative damage and changes in the antioxidant defense system. The severity of the metal-induced effects varied with the metals and the duration of exposure to excess supply of the metals. Each metal induced chlorosis...

The sequence and kinetic properties of phosphoribulokinase purified from Chlamydomonas reinhardtii were determined and compared with the spinach (Spinacea oleracea) enzyme. Chlamydomonas phosphoribulokinase was purified to apparent homogeneity, with a specific activity of 410 micromoles per minute per milligram. Polyclonal antibodies to the purified protein were used to isolate a Chlamydomonas ...

Limited magnesium (Mg) supply adversely affects photosynthesis. This is particularly related to the high demand for Mg of key enzymes in chloroplast, such as photosystems, ATP synthase and ribulose-1,5-bisphosphate carboxylase/oxygenase (Rubisco). The accepted critical concentrations yield dry matter (DM) are 1.5–3.5 mg g?1 DM. Earlier studies on deficiency indicated that carbon fixation by Rub...