Impacts of water stress on gas exchange,water relations,chlorophyll content and leaf structure in the two main Tunisian olive (Olea europaea L.) cultivars |
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Authors: | Mokhtar Guerfel,Olfa Baccouri,Dalenda Boujnah,Wided Chaï bi,Mokhtar Zarrouk |
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Affiliation: | 1. Laboratoire Caractérisation et Qualité de l’Huile d’Olive, Centre de Biotechnologie de Borj Cédria, B.P. 901, 2050 Hammam-Lif, Tunisia;2. Institut de l’Olivier, Station de Sousse, Rue Ibn Khaldoun, B.P. 40, 4061 Sousse, Tunisia;3. Unité de recherche, Biologie et Physiologie Cellulaires Végétales, Département des Sciences Biologiques, Faculté de Sciences de Tunis, Campus Universitaire, 1060 Tunis, Tunisia |
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Abstract: | Leaf structural adaptations for the reduction of water loss were examined in two olive (Olea europaea L.) cultivars (Chemlali and Chétoui) growing under water stress conditions. Leaf measurements included leaf tissue thickness, stomatal density, trichome density, specific leaf area, leaf density, water relations, and gas exchange. We found considerable genotypic differences between the two cultivars. Chemlali exhibited more tolerance to water stress, with a thicker palisade parenchyma, and a higher stomatal and trichome density. Chemlali leaves also revealed lower specific leaf area and had higher density of foliar tissue and lower reduction in net CO2 assimilation rate. The mechanisms employed by these two cultivars to cope with water deficit are discussed at the morpho-structural level. The morphological and structural characteristics of the leaves are in accordance with physiological observations and contribute to the interpretation of why the olive cv. Chemlali is more drought-tolerant than cv. Chetoui. Furthermore, from the behaviour of Chemlali plants we consider this cultivar very promising for cultivation in semi-arid areas. |
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Keywords: | Leaf anatomy Leaf water potential Olea europaea L. Photosynthesis Water stress |
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