Effect of phosphate application levels on soybean [Glycine max [L.] Merr.] seed yield, elements and storage protein composition
2017
Ohtake, N. (Niigata University, Niigata-city, Niigata (Japan). Faculty of Agriculture) | Tanabata, S.I. | Ikarashi, Y. | Shiratori, Y. | Honma, T. | Nagumo, Y. | Takahashi, Y. | Sueyoshi, K. | Ohyama, T.
Various levels of P application were imposed to hydroponically grown soybean plants, and the concentrations of mineral elements and storage protein composition in the matured seeds were analyzed. Non-nodulating (cv T201) and nodulating (cv Enrei) soybean plant were cultivated with nitrate (NaNO3) and fix-N as solo nitrogen source, respectively. Application of phosphate increased P and reduced N concentration in seeds both non-nodulating and nodulating soybean plants. This result indicated that seed mineral composition could be changed by phosphate application irrespective of nitrogen source. Low level phosphate (5microM-P) application to the non-nodulating soybean plants increased beta-conglycinin, a major storage protein in soybean seed, concentration in seed compared with normal level of P (25microM-P) irrespective of nitrate application level. In the nodulating soybean plants, the concentration of beta-subunit of beta-conglycinin was decreased by high level of P (50microM-P) application both all through plants growth and increasing P level after flowering. In conclusion, P application on soybean plants changed mature seed mineral composition and protein composition irrespective of N nutrition.
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