Partitioning of carbon, nitrogen, phosphorus, potassium, calcium, and magnesium in a semidwarf high-yielding rice variety: comparison with a conventional japonica variety

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Abstract
To clarify the physiological character of the high-yielding rice (Oryza sativa L.) varieties, dry matter production and partitioning of C, N, P, K, Ca, and Mg were compared between Suweon 258, a semidwarf indica variety and Musashikogane, a conventional japonica variety under pot conditions. Translocation of C and N in plants was investigated using tracers, 13C and 15N, respectively. The total dry matter and carbon content were similar in the two varieties. However, the panicle weight of Suweon 258 was 23% larger than that of Musashikogane due to the higher weight ratio of panicle/shoot. The Suweon 258 plants actively stored and exported carbohydrates in the culm plus leaf sheath, and also showed a higher partitioning of C, N, P, and Mg to the panicle, whereas the percentage distribution of K. and Ca to the panicle was similar in the two varieties. Total K uptake of Suweon 258 was larger than that of Musashikogane, and in the latter plants K was obviously lost at the late growing stage.