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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...
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