Conceptual approach to lateral salinity gradients around roots of salt-sensitive and salt-tolerant crops under irrigation conditions

Uwe Schleiff

DOI: http://dx.doi.org/10.12775/v10090-011-0009-4

Abstract


Under controlled crop irrigation with brackish water, a vertical soil salinity gradient develops in the rooted soil layer. Furthermore, in periods of soil water depletion, due to ion exclusion by roots, a transpiration-driven, lateral build-up of a salinity gradient between the soil fraction adjacent to roots and distant, occurs. Root morphological traits determine the volume of the soil fraction, in which salt accumulation occurs (rhizospheric soil volume). The increase of soil salinity near roots is greater, when plant roots form a small rhizospheric soil volume (e.g. leek). When roots form a larger rhizospheric soil volume, salts are distributed throughout a larger soil volume, which improves conditions for root water uptake and crop salt tolerance (e.g. rape).

Keywords


crop salt tolerance; brackish irrigation; soil/root-interface; root morphology

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References


Riley D. &. Barber S. A., 1970, Salt accumulation at the soybean (Glycin max. L.Merr.) root-soil interface, Soil Sci. Soc. Amer. Proc. 34: 154-155.

Schleiff U., 1987, A vegetation technique to study the water uptake by roots from salinized rhizospheric soils. Zeitschrift fuer Pflanzenernaehrung und Bodenkunde 150: 139-146.

Schleiff U., 2010, The forgotten link in improving crop salt tolerance research under brackish irrigation: lateral soil salinity gradients around roots, [in:] M. Pessarakli (ed.), Handbook of Plant and Crop Stress, third edition, Taylor & Francis Group, chapter 45: 1147-1154.




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