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Physiological and anatomical changes induced by drought in two olive cultivars (cv Zalmati and Chemlali)

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Abstract

Photosynthetic gas exchange, vegetative growth, water relations and fluorescence parameters as well as leaf anatomical characteristics were investigated on young plants of two Olea europaea L. cultivars (Chemlali and Zalmati), submitted to contrasting water availability regimes. Two-year-old olive trees, grown in pots in greenhouse, were not watered for 2 months. Relative growth rate (RGR), leaf water potential (ΨLW) and the leaf relative water content (LWC) of the two cultivars decreased with increasing water stress. Zalmati showed higher values of RGR and LWC and lower decreased values of ΨLW than Chemlali, in response to water deficit, particularly during severe drought stress. Water stress also caused a marked decline on photosynthetic capacity and chlorophyll fluorescence. The net photosynthetic rate, stomatal conductance, transpiration rate, the maximal photochemical efficiency of PSII (F v/F m) and the intrinsic efficiency of open PSII reaction centres (F′ v/F′ m) decreased as drought stress developed. In addition, drought conditions, reduced leaf chlorophyll and carotenoids contents especially at severe water stress. However, Zalmati plants were the less affected when compared with Chemlali. In both cultivars, stomatal control was the major factor affecting photosynthesis under moderate drought stress. At severe drought-stress levels, the non-stomatal component of photosynthesis is inhibited and inactivation of the photosystem II occurs. Leaf anatomical parameters show that drought stress resulted in an increase of the upper epidermis and palisade mesophyll thickness as well as an increase of the stomata and trichomes density. These changes were more characteristic in cv. ‘Zalmati’. Zalmati leaves also revealed lower specific leaf area and had higher density of foliar tissue. From the behaviour of Zalmati plants, with a smaller reduction in relative growth rate, net assimilation rate and chlorophyll fluorescence parameters, and with a thicker palisade parenchyma, and a higher stomatal and trichome density, we consider this cultivar more drought-tolerant than cv. Chemlali and therefore, very promising for cultivation in arid areas.

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Acknowledgments

We gratefully acknowledge all the technical staff of the superior agricultural institute (ISA) and the Superior Institute of Biotechnology (ISBM) for their help to conducting these experiments.

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  1. Fayçal Boughalleb

    Present address: Laboratoire de Physiologie Végétale, Institut Supérieur Agronomique de Chott Mériem (ISA - CM), BP 47, 4042, Chott-Mériem, Sousse, Tunisia

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  1. Institut National de Recherche en Génie Rural, Eaux et Forêts (INRGREF), Unité d’Expérimentation Agricole, Oued Souhail, BP 20, 8000, Nabeul, Tunisia

    Hichem Hajlaoui

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  1. Fayçal Boughalleb
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Correspondence to Fayçal Boughalleb.

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Communicated by J. Zwiazek.

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Boughalleb, F., Hajlaoui, H. Physiological and anatomical changes induced by drought in two olive cultivars (cv Zalmati and Chemlali). Acta Physiol Plant 33, 53–65 (2011). https://doi.org/10.1007/s11738-010-0516-8

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