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Journal of Botany
Volume 2014, Article ID 703874, 7 pages
http://dx.doi.org/10.1155/2014/703874
Research Article

Effects of Water Regime on the Structure of Roots and Stems of Durum Wheat (Triticum durum Desf.)

1Laboratory of Agro-Biotechnology and Nutrition in Semi-Arid Areas, Faculty of Natural Sciences and Life, University Ibn Khaldoun, BP 78, 14000 Tiaret, Algeria
2Scientific and Technical Research Centre for Arid Areas (CRSTRA), BP 1682 RP, 07000 Biskra, Algeria

Received 6 May 2014; Revised 23 July 2014; Accepted 25 July 2014; Published 17 August 2014

Academic Editor: M. Yasin Ashraf

Copyright © 2014 Amina Labdelli et al. This is an open access article distributed under the Creative Commons Attribution License, which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited.

Abstract

Yield improvement of durum wheat is considerably limited by the expression of environmental abiotic factors. Water deficits are one of these limiting factors. Plants develop various strategies to tolerate the effects of water deficit. Some of such mechanisms might occur in the root and stem systems. The present study aimed to investigate some anatomical traits contributing to the drought tolerance in the durum wheat. The anatomical variations of the meristem of roots and stems, as a response to water deficit, were evaluated. The results indicated that the enhancement of the intensity of water deficit was accompanied by profound structural changes in the piliferous zone of roots. Water deficit caused a significant decrease in the diameter of the newly formed adventitious roots, which can be explained by a reduction in the thickness of the cortical parenchyma, through the reduction of cell size. This action was usually a contrary effect in the principal adventitious roots. The study also showed that increasing the intensity of water deficit reduced the diameter of vessels in the primary xylem, thereby increasing the hydraulic resistance of roots and lowering the flow of sap.