Open AccessInfluence of light and mineral nitrogen forms on the activity of some enzymes in Cucumis sativus L. cotyledons
Author(s) -
Genowefa Kubik-Dobosz,
K. Soroka
Publication year - 2015
Publication title -
acta societatis botanicorum poloniae
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.297
H-Index - 29
eISSN - 2083-9480
pISSN - 0001-6977
DOI - 10.5586/asbp.1979.035
Subject(s) - glutamate dehydrogenase , glutamine synthetase , cucumis , nitrogen , ammonium , glutamate synthase , enzyme , darkness , etiolation , biochemistry , glutamine , biology , alanine , chemistry , botany , amino acid , glutamate receptor , receptor , organic chemistry
It was demonstrated that when nitrogen was deficient in the medium, the activity of glutamine synthetase (GS), glutamate dehydrogenase (GDH), alanine aminotransferase (GPT) and aspartate aminotransferase (GOT) in etiolated cucumber cotyledons was higher than in those of seedlings growing under light. When the plants grew on nitrate or ammonium medium, light stimulated GS activity and depressed that of GDH and GOT, without changing the activity of GPT. It was found that the influence of the form of mineral nitrogen on the activity of the studied enzymes was dependent on light. On the basis of the results. obtained, the contribution of the GS glutamate synthase system and GDH to the incorporation of the taken up nitrogen into the amino acids in light and in darkness is discussed