The Role of Sugar-related Regulation in the Light-dependent Alterations of Arabidopsis Glutamate Dehydrogenase Genes Expression
Journal Title: Журнал ÑтреÑÑ-физиологии и биохимии - Year 2014, Vol 10, Issue 4
Abstract
Expression of [i]gdh1[/i] and [i]gdh2[/i] genes of [i]Arabidopsis thaliana[/i] increases in the dark and decreases in the light. The reason of such alteration seems to be a glucose rising in photosynthetic cell in the light, but this hypothesis needs to be confirmed. In this work we investigate the role of glucose and hexokinase 1 in the light-dependent regulation of the [i]gdh1[/i] and [i]gdh2[/i] expression. A comparison of expression profiles of [i]apl3[/i], [i]gdh1[/i], [i]gdh2[/i] genes in presenсe of exogenous sucrose in the dark and in the light has demonstrated that sugar-related repression of [i]gdh1[/i] and [i]gdh2[/i] genes is insufficient to provide the high decrease of their transcripts in the light. Using Arabidopsis mutant gin2-1 with a defect in [i]hxk1[/i] gene we demonstrated that such a decrease is not depended on the regulatory function of hexokinase 1. We presume that light- dependent alterations of [i]gdh1[/i] and [i]gdh2[/i] expression are mediated by some chloroplast-to-nucleus regulatory signals.
Authors and Affiliations
E. Garnik, V. Belkov, Yu. Konstantinov
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