Features of peroxidase activity in grapevine plants in relation to the content of soil active limestone, water and low temperature stress
2006
Negru, P. | Siscanu, G. | Popovici, A.
Two grapevine varieties differing by the degree of resistance to drought and frost, grafted on the rootstock Riparia X Rupestris 101-14, were subjects for study. The plants were grown in vegetative pots on soil containing 5; 10 and 20 percent of active calcium carbonates. To reach the state of water stress, the watering was stopped for 14-20 days, the soil moisture being reduced to 20-14 percent. Frost resistance was determined by subjecting the plants to negative temperatures in a freezer. It was established that soil calcium carbonates, at concentrations comprised within the limits of the tolerance of the rootstock (10 percent), induce the increase of peroxidase activity at shoot growth stage and its decrease during deep dormancy. Water stress strengthens peroxidase activity in leaf tissues. The hypothermy increases enzyme activity in the cells of fruit fingers at the slightly resistant variety and reduces it in the variety with enhanced resistance. We consider that peroxidase activity is one of the chains in the mechanism of adaptive reactions of grapevine plants to the conditions of carbonate soils.
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