Mineral nitrogen sources differently affect root glutamine synthetase isoforms and amino acid balance among organs in maize.

ABSTRACT:

Background

Glutamine synthetase (GS) catalyzes the first step of nitrogen assimilation in plant cell. The main GS are classified as cytosolic GS1 and plastidial GS2, of which the functionality is variable according to the nitrogen sources, organs and developmental stages. In maize (Zea mays L.) one gene for GS2 and five genes for GS1 subunits are known, but their roles in root metabolism are not yet well defined. In this work, proteomic and biochemical approaches have been used to study root GS enzymes and nitrogen assimilation in maize plants re-supplied with nitrate, ammonium or both.

Results

The plant metabolic status highlighted the relevance of root system in maize nitrogen assimilation during both nitrate and ammonium nutrition. The analysis of root proteomes allowed a

SUBMITTER: Prinsi B 

PROVIDER: S-EPMC4393875 | biostudies-literature | 2015 Apr

REPOSITORIES: biostudies-literature