Use of concentrated macronutrient solutions to separate osmotic from NaCl-specific effects on plant growth. [Symposium paper]
1986
Termaat, A. | Munns, R. (Commonwealth Scientific and Industrial Research Organization (Australia). Div. of Plant Industry)
Barley, wheat, Egyptian clover and white clover were grown in NaCl and concentrated macronutrient (modified Hoagland's nutrients) solutions of matching osmotic pressures. After 14 days, plants grown in concentrated macronutrients were smaller than controls (plants grown in normal strength nutrient solution) but had similar root:shoot ratios. NaCl-grown plants were less than half the size of plants in concentrated macronutrients and had higher root:shoot ratios. This was not due to NaCl-induced phosphate uptake. Clovers did not show increased root:shoot ratio in NaCl. For barley, uptake by the shoot of K, Mg, Ca and N was similar in all plants, but transport of these minerals was reduced in NaCl-grown plants. Tissue osmotic pressure in NaCl-grown cereals was higher than controls or macronutrient-grown plants, but a lower rate of solute uptake generated this osmotic pressure. Growth in NaCl may be limited by a reduced rate of tansport of an essential nutrient to the shoot.
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