Plant and Soil

, Volume 60, Issue 1, pp 73–83 | Cite as

The uptake of sodium by perennial ryegrass and its relationship to potassium supply in flowing solution culture

  • S. C. Jarvis
  • M. J. Hopper
Article

Summary

The uptake of Na and K by perennial ryegrass from flowing solution culture with monitored concentrations of Na and K was followed in two experiments. In the first, when only 50 and 10 per cent of the K uptake by one set of plants, grown with K held constant at 2.5 μeq 1−1, was supplied to two other linked sets of plants and the balance supplied as Na, there was a rapid decrease in K, and an increase in Na, concentration in the shoots over a 20-day period. However, when compared with the plants grown in K in solution held constant, there was not a complete replacement of Na for K. In the second experiment the concentration of K in the culture solution was held constant at 2 μeq 1−1 and Na at 0, 5, 25, 50 and 100 μeq 1−1. Although uptake of Na increased with increasing concentration in solution the contents in the plants were low,i.e. less than 0.19 per cent and decreased with time. There was an increase in the yield of both shoots and roots with increasing Na in the solution; it was suggested that, during the early stages of growth there may have been an inadequate supply of K and that Na may have substituted for K in some of the non-specific roles of K in the plants. There was evidence in both experiments that a flux of H-ions was involved in the uptake of Na.

Key Words

Distribution (shoots roots) Flowing solution culture H-ions Lolium perenne Potassium Sodium Uptake 

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Copyright information

© Martinus Nijhoff/Dr W. Junk Publishers 1981

Authors and Affiliations

  • S. C. Jarvis
    • 1
  • M. J. Hopper
    • 1
  1. 1.The Grassland Research InstituteMaidenhead

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