Influences of Metabolic Inhibitors on the Uptake of Sodium by Some Herbage Species

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  • OYAMADA Masayuki
    Department of Grassland Science, Faculty of Agriculture, Miyazaki University
  • IKEDA Hajime
    Department of Grassland Science, Faculty of Agriculture Miyazaki University

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  • 数種の飼料作物のナトリウム吸収に及ぼす代謝阻害剤の影響
  • スウシュ ノ シリョウ サクモツ ノ ナトリウム キュウシュウ ニ オヨボス

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Abstract

The influence of metabolic inhibitors on the uptake of sodium (Na) was examined by using five herbage species; Rhodesgrass (Chloris gayana KUNTH.), green panic (Panicum maximum JACQ. var. trichoglume EYLES), Italian ryegrass (Lolium multiflorum LAM.), African millet (Eleusine coracana (L.) GAERTN.) and timothy (Phleum pratense L.). Eeach species was grown in culture solution added with sodium azide (NaN_3) or 2,4-dinitrophenol (DNP). Uptakes of phosphorus (P), potassium (K), calcium (Ca) and sodium (Na) were estimated from the residual amount of each element in the culture solution. The results were summarized as follows: 1) The application of NaN_3 strongly inhibited the uptake of P, but less inhibited Ca uptake. The extent of inhibition of Na absorption by NaN_3 varied among species with the following descending order; Rhodesgrass and green panic>Italian ryegrass>African millet and timothy. 2) The influence of DNP on uptakes of P, K, Ca and Na varied among elements. Uptakes of both P and K were strongly inhibited at concentrations above 10^<-5>mol/l DNP and showed even a negative absorption above 10^<-4>mol/l DNP. However, the uptake of Ca was weakly inhibited over an examined range of concentrations of DNP. The uptake of Na by Rhodesgrass and green panic decreased by DNP as was the case of P or K. Also the uptake of Na by Italian ryegrass was inhibited to some extent by DNP. However, for African millet and timothy, the absorption of Na was weakly inhibited by DNP in the same way as Ca. From these results, it was suggested that the uptake of Na had a close relation to the plant metabolism for such herbage species with higher Na content as Rhodesgrass or green panic.

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