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Annals of Botany 43: 383-391, 1979
© 1979 Annals of Botany Company

RESEARCH-ARTICLE

Effects of a Range of O2 Concentrations on Porosity of Barley Roots and on their Sugar and Protein Concentrations

L. R. BENJAMIN* and H. GREENWAY

Agronomy Department, University of Western Australia Nedlands, W.A. 6009

* Present address: National Vegetable Research Station, Wellesbourne, Warwick CV35 96F, England.

Accepted: 14 March 1978   

Barley was grown at a range of oxygen concentrations (0.5–9 mg l–1), in nutrient solutions. Growth of both shoots and seminal roots was restricted by O2 concentrations lower than 2–3 mg l–1) but nodal root growth was not.

Root porosities were increased even at those O2 concentrations which did not restrict growth, and were inversely proportional to the protein levels of the roots. Sugar concentrations increased appreciably only at those O2 concentrations which also restricted growth.

Hordeum vulgare L., barley, root porosity, sugar, protein, oxygen concentration


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