Changes of leaves glutamine synthetase activity during ontogenesis winter wheat depending on nutrition condition
A. Dubitsky, A. Gabriel
Institute of Agriculture and Stockbreeding of West Region UAAS
5 Grushevskogo St., v. Obroshyno, Lviv District, 81115, Ukraine
The activity of glutamine synthetase (EC 188.8.131.52) within winter wheat (Triticum aestivum L.) leaves during plant ontogenesis under different nutrition conditions was studied. It is established, that under optimal nutrition conditions the leaves glutamine synthetase activity reaches of maximum quantity during stalking phase and spiking phase, id est during the phases, that are characterized by the intensive plant growth rate and the plant vegetative weight accession. The unfavorable soil nutrition regime (low level of the basic nutrition elements, low soil pH value in common with sufficient high levels of the basic nutrition elements) drive to the diminished leaves glutamine synthetase activity and slowing-down of this enzymatic activity increment during plant ontogenesis. During winter wheat ontogenesis on the soils with different nutrition regimes, the dependence leaves glutamine synthetase activity on the ammonium and amide nitrogen contents in the leaves mainly characterize by negative correlate relations. Thus, results indicate that ammonium ions and amides are not involved directly in processes of synthesis induction or activation of the glutamine synthetase during winter wheat ontogenesis.
Keywords: Triticum aestivum, soil nutrition regime, productivity, glutamine synthtase, ammonium, amides.