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Glutathione reductase (GR) plays an important role in the response to biotic and abiotic stresses in plants. We studied the expression patterns and enzyme activities of GR in graminaceous plants under Fe-sufficient and Fe-deficient conditions by isolating cDNA clones for chloroplastic GR (HvGR1) and cytosolic GR (HvGR2) from barley. We found that the sequences of GR1 and GR2 were highly conserved in graminaceous plants. Based on their nucleotide sequences, HvGR1 and HvGR2 were predicted to encode polypeptides of 550 and 497 amino acids, respectively. Both proteins showed in vitro GR activity, and the specific activity for HvGR1 was 3-fold that of HvGR2. Northern blot analyses were performed to examine the expression patterns of GR1 and GR2 in rice (Os), wheat (Ta), barley (Hv), and maize (Zm). HvGR1, HvGR2, and TaGR2 were upregulated in response to Fe-deficiency. Moreover, HvGR1 and TaGR1 were mainly expressed in shoot tissues, whereas HvGR2 and TaGR2 were primarily observed in root tissues. The GR activity increased in roots of barley, wheat, and maize and shoot tissues of rice, barley, and maize in response to Fe-deficiency. Furthermore, it appeared that GR was not post-transcriptionally regulated, at least in rice, wheat, and barley. These results suggest that GR may play a role in the Fe-deficiency response in graminaceous plants.
Plant Molecular Biology – Springer Journals
Published: Aug 21, 2007
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