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Regulation of sulfate assimilation by nitrogen and sulfur nutrition in poplar trees

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Abstract

Plants cover their need for sulfur by taking up inorganic sulfate, reducing it to sulfide, and incorporating it into the amino acid cysteine. In herbaceous plants the pathway of assimilatory sulfate reduction is highly regulated by the availability of the nutrients sulfate and nitrate. To investigate the regulation of sulfate assimilation in deciduous trees we used the poplar hybrid Populus tremula × P. alba as a model. The enzymes of the pathway are present in several isoforms, except for sulfite reductase and γ-glutamylcysteine synthetase; the genomic organization of the pathway is thus similar to herbaceous plants. The mRNA level of APS reductase, the key enzyme of the pathway, was induced by 3 days of sulfur deficiency and reduced by nitrogen deficiency in the roots, whereas in the leaves it was affected only by the withdrawal of nitrogen. When both nutrients were absent, the mRNA levels did not differ from those in control plants. Four weeks of sulfur deficiency did not affect growth of the poplar plants, but the content of glutathione, the most abundant low molecular thiol, was reduced compared to control plants. Sulfur limitation resulted in an increase in mRNA levels of ATP sulfurylase, APS reductase, and sulfite reductase, probably as an adaptation mechanism to increase the efficiency of the sulfate assimilation pathway. Altogether, although distinct differences were found, e.g. no effect of sulfate deficiency on APR in poplar leaves, the regulation of sulfate assimilation by nutrient availability observed in poplar was similar to the regulation described for herbaceous plants.

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Correspondence to Stanislav Kopriva.

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Kopriva, S., Hartmann, T., Massaro, G. et al. Regulation of sulfate assimilation by nitrogen and sulfur nutrition in poplar trees. Trees 18, 320–326 (2004). https://doi.org/10.1007/s00468-003-0309-4

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