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Background   Changing the phosphorus (P) nutrition leads to changes in plant metabolism. The aim of this study was to investigate how these changes are reflected in the distribution of  33 P and the isotopic composition of oxygen associated to P (δ 18 O P ) in different plant parts of soybean ( Glycine max  cv. Toliman). Two P pools were extracted sequentially with 0.3 M trichloroacetic acid (TCA P) and 10 M nitric acid (HNO 3 ; residual P).    Results  The δ 18 O P  of TCA P in the old leaves of the − P plants (23.8‰) significantly decreased compared to the + P plants (27.4‰). The  33 P data point to an enhanced mobilisation of P from residual P in the old leaves of the − P plants compared to the + P plants.    Conclusions  Omitting P for 10 days lead to a translocation of P from source to sink organs in soybeans. This was accompanied by a significant lowering of the δ 18 O P  of TCA P in the source organs due to the enzymatic hydrolysis of organic P. Combining  33 P and δ 18 O P  can provide useful insights in plant responses to P omission at an early stage.

plant methods

A dual isotopic approach using radioactive phosphorus and the isotopic composition of oxygen associated to phosphorus to understand plant reaction to a change in P nutrition