Accumulation and subcellular distribution of cations in relation to the growth of potassium-deficient barley

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Leigh, R. A., Chater, M., Storey, R. and Johnston, A. E. 1986. Accumulation and subcellular distribution of cations in relation to the growth of potassium-deficient barley. Plant, Cell and Environment. 9 (7), pp. 595-604.

AuthorsLeigh, R. A., Chater, M., Storey, R. and Johnston, A. E.
Abstract

Growth of barley (Hordeum vulgare L., cv. Georgie) was insensitive to soil K content above about 150 mg kg−1, but at lower levels it declined. The reduction in yield was greater in soils containing approximately 10 mg Na kg−1 than in soils with about 90 mg kg−1 of Na. Growth was unaffected by changes in shoot K concentration above 75 mol m−3, but declined at lower concentrations, and the decrease was less in plants grown in soils with high Na. Growth responses were not simply related to tissue K concentrations because plants grown in soils with extra Na had higher yields but lower K concentrations.

When soil Na was low, plants accumulated Ca as tissue K declined, but when Na was provided this ion was accumulated. Plant Mg concentrations were generally low but increased as K decreased. The Ca and Mg were osmotically active. There were highly significant inverse linear relationships between yield and either the Ca or Mg concentrations in the shoots.

X‐ray microanalysis was used to examine the compartmentation of cations in leaves from barley plants (cv. Clipper) grown in nutrient solutions with high and low K concentrations. In plants grown with 2.5 mol m−3 K, this was the major cation in both the cytoplasm and vacuole of mesophyll cells. However, in plants grown with 0.02 mol m−3 K it declined to undetectable levels in the vacuole, although it was still detectable in the cytoplasm. In all plants, Ca was mainly located in epidermal cells. The implication of the results for explaining responses to K. in terms of compartmentation of solutes is discussed.

KeywordsHordeum vulgare L.; Gramineae; barley; growth responses; solute compartmentation; potassium; X‐ray micro‐analysis; vacuole; cytoplasm
Year of Publication1986
JournalPlant, Cell and Environment
Journal citation9 (7), pp. 595-604
Digital Object Identifier (DOI)doi:10.1111/1365-3040.ep11616346
Open accessPublished as non-open access
Publisher's version
Copyright license
Publisher copyright
Output statusPublished
Publication dates
Online01 Sep 1986
Publication process dates
Accepted25 Jul 1986
PublisherWiley-Blackwell
ISSN0140-7791

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