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- W2045304954 abstract "An experiment was conducted to investigate alterations in uptake and assimilation of NO3− by phosphorus-stressed plants. Young tobacco plants (Nicotiana tabacum [L.], cv NC 2326) growing in solution culture were deprived of an external phosphorus (P) supply for 12 days. On selected days, plants were exposed to 15NO3− during the 12 hour light period to determine changes in NO3− assimilation as the P deficiency progressed. Decreased whole-plant growth was evident after 3 days of P deprivation and became more pronounced with time, but root growth was unaffected until after day 6. Uptake of 15NO3− per gram root dry weight and translocation of absorbed 15NO3− out of the root were noticeably restricted in −P plants by day 3, and effects on both increased in severity with time. Whole-plant reduction of 15NO3− and 15N incorporation into insoluble reduced-N in the shoot decreased after day 3. Although the P limitation was associated with a substantial accumulation of amino acids in the shoot, there was no indication of excessive accumulation of soluble reduced-15N in the shoot during the 12 hour 15NO3− exposure periods. The results indicate that alterations in NO3− transport processes in the root system are the primary initial responses limiting synthesis of shoot protein in P-stressed plants. Elevated amino acid levels evidently are associated with enhanced degradation of protein rather than inhibition of concurrent protein synthesis." @default.
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- W2045304954 date "1990-09-01" @default.
- W2045304954 modified "2023-10-12" @default.
- W2045304954 title "Phosphorus Stress Effects on Assimilation of Nitrate" @default.
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- W2045304954 doi "https://doi.org/10.1104/pp.94.1.328" @default.
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