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Plant Biol (Stuttg) 2004; 6(4): 415-421
DOI: 10.1055/s-2004-820889
Original Paper

Georg Thieme Verlag Stuttgart KG · New York

Aquaporin Functionality in Roots of Zea mays in Relation to the Interactive Effects of Boron and Salinity

E. Bastías1 , N. Fernández-García2 , M. Carvajal2
  • 1Facultad de Agronomía, Universidad de Tarapacá, Casilla 6-D, Arica, Chile
  • 2Dpto. Nutrición y Fisiología Vegetal, Centro de Edafología y Biología Aplicada del Segura, CSIC, P.O. Box 164, 30100 Espinardo, Murcia, Spain
Further Information

Publication History

Publication Date:
12 July 2004 (online)

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Abstract

Zea mays L. cv. amylacea, a plant tolerant of B and salinity, was used to determine the involvement of aquaporin functionality in the interactive effects of B and salinity. Also, growth, chlorophyll concentration, and water relations were studied. While growth and chlorophyll concentration did not show noticeable changes under saline conditions, the decrease in leaf water potential and osmotic potential, together with the marked decrease of stomatal conductance and root hydraulic conductance, showed that the plants were adjusted osmotically. However, no effect of B was observed. The very weak response of the Lpc of salt-stressed roots to Hg suggested that water channels were greatly reduced in number or, if present, were non-functional. The evidence that substantial B movement can occur through diffusion and channel-mediated transport is compelling, and could account for B uptake under conditions of adequate or greater B supply. Therefore, the reduction in the functionality of aquaporins for NaCl-treated plants could be related to the reduction of B concentrations in roots and leaves in B + NaCl-treated plants, in comparison with plants treated only with B.

Key words

Aquaporins - boron - cell pressure probe - chlorophyll concentration - root hydraulic conductivity - salinity - stomatal conductance - water relations.

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M. Carvajal

CEBAS-CSIC

P.O. Box 164

30100 Espinardo, Murcia

Spain

Email: mcarvaja@cebas.csic.es

Section Editor: J. Schroeder