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3 Acta Physiologiae Plantarum

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Flooding-induced changes in photosynthesis and oxidative status in maize plants

100%

Yordanova R. U. , Popova L. P.

Acta Physiologiae Plantarum

2007

tom 29

nr 6

Maize plants (Zea mays L.) were subjected to soil flooding for 72, 96, and 120 h. A noticeable decrease in the rate of net photosynthesis (PN) and the activity of ribulose-1,5-bisphosphate carboxylase (RuBPC, EC 4.1.1.39) were observed. The values of intercellular CO₂ concentrations (ci) increased in all flooded plants without significant changes in stomatal conductance (gs). The activity of phosphoenolpyruvate carboxylase (PEPC, EC 4.1.1.31) increased twofold 120 h after soil flooding. Flooding of maize plants led to a decrease in chlorophyll and protein levels and to slight increase of proline content. Flooded plants exhibited a large accumulation of leaf acidity. An increase in the values of some important parameters associated with oxidative stress, namely peroxides production, lipid peroxidation, and electrolyte leakage, confirmed the suggestion that root oxygen deficiency caused photooxidative damage in maize leaves.

Carboxylating enzymes and carbonic anhydrase functions were suppressed by zinc deficiency in maize and chickpea plants

80%

Salama Z. A. , El-Fouly M. M. , Lazova G. , Popova L. P.

Acta Physiologiae Plantarum

2006

tom 28

nr 5

Maize and chickpea plants were grown in a controlled environment with 0.5 pM Zn or without Zn and various photosynthetic reactions were studied. The chlorophyll level, the rate of photosynthesis and photosystem II activity, the activity of carboxylating enzymes and that of carbonic anhydrase were suppressed by Zn deficiency in both plant species. Ribulose-1,5-bisphosphate carboxylase/oxygenase (Rubisco) was quantified using polyacrylamide gel electrophoresis. Growing plants in a medium without Zn caused a decrease in the total protein level and in the levels of large and small subunits of Rubisco.

Stress signalling role of salicylic acid to cadmium-induced oxidative stress

70%

Popova L. P. , Krantev A. , Yordanova R. , Janda T. , Szalai G.

nr 1 Suppl.