Distinct signalling pathways and transcriptome response signatures differentiate ammonium- and nitrate-supplied plants.

ABSTRACT: Nitrogen is the only macronutrient that is commonly available to plants in both oxidized and reduced forms, mainly nitrate and ammonium. The physiological and molecular effects of nitrate supply have been well studied, but comparatively little is known about ammonium nutrition and its differential effects on cell function and gene expression. We have used a physiologically realistic hydroponic growth system to compare the transcriptomes and redox status of the roots of ammonium- and nitrate-supplied Arabidopsis thaliana plants. While approximately 60% of nitrogen-regulated genes displayed common responses to both ammonium and nitrate, significant 'nitrate-specific' and 'ammonium-specific' gene sets were identified. Pathways involved in cytokinin response and reductant generation/distributi

SUBMITTER: Patterson K 

PROVIDER: S-EPMC2920365 | biostudies-literature | 2010 Sep

REPOSITORIES: biostudies-literature