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Annals of Botany 83: 19-27, 1999
© 1999 Annals of Botany Company

Water Retention Capacity in Root Segments Differing in the Degree of Exodermis Development

E. TALEISNIK+, G. PEYRANO, A. CÓRDOBA and C. ARIAS

Instituto de Fitopatología y Fisiología Vegetal, INTA, Cna 60 Cuadras Km 5 1/2, CP 5119, Córdoba, Argentina

June 15, 1998 ; August 5, 1998 . September 10, 1998

Water loss from roots back into drying soil is a problem of practical importance in plants growing under conditions of very low substrate water potential, such as dry or saline areas. Root exodermis is relatively impermeable and has been suggested to play a protective role against water loss. The relative water retention ability was compared in root segments from exodermal (maize, onion, sunflower, Rhodes grass and sorghum) and non-exodermal species (Pisum sativum,Vicia fabaand wheat). Apical and basal segments from exodermal roots, with different degrees of exodermis development, were also compared, as were segments from sorghum roots in which the exodermis thickness had been modified by subjecting the plants to a 30 d water stress treatment. Water retention was significantly higher in segments from exodermal roots. In each root, water loss was higher in apical than in basal segments, regardless of the presence of exodermis. In sorghum, prolonged drought treatment increased exodermis thickening in nodal roots, however, no differences in rates of water loss were observed in segments obtained from control and droughted plants. Soil sheaths formed around roots of Rhodes grass growing in very dry soil with the epidermis adhering tightly to the sheath. In plants growing in the field, soil sheaths may be more effective than the exodermis in preventing root water loss.Copyright 1999 Annals of Botany Company.

Root, exodermis, rhizosheaths, water loss.


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