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American Journal of Botany, Vol 85, 10, Copyright © 1998 by Botanical Society of America, Inc.

PHYSIOLOGY AND BIOCHEMISTRY

Effects of soil salt levels on the growth and water use efficiency of Atriplex canescens (Chenopodiaceae) varieties in drying soil

EP Glenn and JJ Brown

The effect of salt stress on the growth and water use efficiency of the xerohalophyte Atriplex canescens (Pursh.) Nutt. in drying soil was determined by growing plants to the wilting point in soils receiving a one-time irrigation of nutrient solution containing low, medium, and high levels of NaCl. The experiment compared three varieties of A. canescens that differed in salt tolerance and capacity for Na and K uptake in previous research. Contrary to expectations, we did not find that water and salt stress were strictly additive in reducing plant performance. Soil salts enhanced the growth performance of the plants in drying soil by increasing their days to wilting, ability to extract water from the soil, organic matter production, and water use efficiency. The variety with the highest salt tolerance also had the highest growth rates and water use efficiency on drying soils. We conclude that tolerances to water and salt stress are linked through a common mechanism of Na uptake for osmotic adjustment in this species.


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J.-P. Martinez, J.-M. Kinet, M. Bajji, and S. Lutts
NaCl alleviates polyethylene glycol-induced water stress in the halophyte species Atriplex halimus L.
J. Exp. Bot., September 1, 2005; 56(419): 2421 - 2431.
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Copyright © 1998 by the Botanical Society of America, Inc.