[Modifications induced by hydric stress and by phosphorus and iron nutrition on glucide and free amino acid content in soybean plants] | Modificari induse de sresul hidric, nutritia minerala cu fosfor si fier in continutul de glucide si aminoacizi liberi in plantele de soia
2008
Gojinetchi, O., Academia de Stiinte a Moldovei, Chisinau (Republic of Moldova). Inst. de Genetica si Fiziologie a Plantelor | Rotaru, V. | Budac, A. | Corduneanu, P.
A soil pot (cernoziom carbonated) culture experiment was conducted to determine the modification in carbohydrates and free amino acid content in soybean (cv Zodiac) leaves in relation to phosphorus and iron nutrition under water stress conditions. Mineral nitrogen was applied as Ca(NO3)2.4H2O (50 mg N/kg soil); phosphorus - KH2PO4 (100 mg P/kg soil); the trace element iron - Fe-EDTA. The seeds were inoculated at sowing with the preparation Bradyrhizobium japonicum (Rh). Soybean plants were exposed to drought for 14 days during flowering stage, the samples were collected after stress period. P-sufficient supply decreased the content of nonstructural carbohydrates (sucrose and hexose sugars) in leaves. This result was due to translocation of carbohydrates in sink organs of roots and nodules. Iron supplemental nutrition (on the background of phosphorus and nitrogen) stimulated the accumulation of free amino acids and soluble sugars, irrespective of the level of soil moisture. Water shortage induced accumulation level of free amino acids in leaves. The application of both phosphorus and iron increased the synthesis of amino acids in inoculated as well as non-inoculated soybean plants. Hence the experimental data further emphasize the physiological importance of adequate nutrition with phosphorus and iron to attenuate the drought impact on plant metabolism and productivity.
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