Analysis of amino acid metabolism in the ear of maize mutants deficient in two cytosolic glutamine synthetase isoenzymes highlights the importance of asparagine for nitrogen translocation within sink organs.

Abstract excerpt

Nitrogen (N) metabolism was characterized in the developing ear of glutamine synthetase deficient mutants (gln1-3, gln1-4 and gln1-3/gln1-4) of maize exhibiting a reduction in kernel yield. During the grain-filling period, the metabolite contents, enzyme activities and steady-state levels of transcripts for marker genes of amino acid synthesis and interconversion were monitored in the cob and kernels. The ear of...

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