Abstract
Nitrogen, which is one of the most determining factors in the growth, survival andreproduction of plants is unfortunately also one of the most fluctuating elements spatiallyand temporally in the soil. A tight regulation of the expression for the genes involved in itsuptake and transport is therefore decisive. However, some genes involved in nitrogen nutritionpresent a high level of transcriptional variability between plants even in absence of geneticand environmental differences.In this context, we are analysing the role of the high expression variability for the high-affinitynitrate transporter, namely NRT2.1, in the response to fluctuation in nitrate in Arabidopsisthaliana. We will also show our results of the impact of certain fluctuating nitrate conditionson this inter-individual variability