Olive Olea europaea L. However, olive fruit production and the economic survival of the orchard operation does not depend solely on tree survival. In table olive production, maximum fruit size and fruit yield must be maintained, while in olive oil production, oil yield and quality must be maximized if an orchard is to remain economically viable. Adequate water is critical to maintaining orchard productivity since olive is extremely responsive to irrigation in terms of maximizing shoot growth, fruit size, and fruit yield, and oil yield per acre.

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C Corresponding author. Email: sofo unibas. After 20 d without irrigation, mean predawn leaf water potential fell from —0. In particular, a marked increase in APX activity was found in leaves of plants at severe drought stress.

CAT activity increased during severe water deficit conditions in leaves and fine roots. The patterns of POD and IAA oxidase activity ran in parallel and showed increases in relation to the degree of drought. In contrast, PPO activity decreased during the progression of stress in all the tissues studied. The results show that the ability of olive trees to up-regulate the enzymatic antioxidant system might be an important attribute linked to drought tolerance.

This could limit cellular damage caused by active oxygen species during water deficit. Keywords: ascorbate peroxidase, catalase, guaiacol peroxidase, indoleacetate oxidase, polyphenol oxidase, superoxide dismutase. We are grateful to Dr Mike Clearwater for his important suggestions about the manuscript. Aebi H Catalase in vitro. Asada K The water—water cycle in chloroplasts: scavenging of active oxygens and dissipation of excess photons.

Feierabend J, Schaan C, Hertwig B Photoinactivation of catalase occurs under both high and low temperature stress conditions and accompanies photoinhibition of photosystem II. Lo Gullo AM, Salleo S Different strategies of drought resistance in three Mediterranean sclerophyllous trees growing in the same environmental conditions. Philosophical Transactions of the Royal Society of London. Smirnoff N Ascorbic acid: metabolism and functions of a multi-facetted molecule.

Turner NC Techniques and experimental approaches for the measurement of plant water status. Ushimaru T, Maki Y, Sano S, Koshiba K, Asada K, Tsuji H Induction of enzymes involved in the ascorbate-dependent antioxidative system, namely, ascorbate peroxidase, monodehydroascorbate reductase and dehydroascorbate reductase, after exposure to air of rice Oriza sativa seedlings germinated under water.

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Photosynthetical activity modelisation of olive trees growing under drought conditions

Increasing consciousness regarding the nutritional value of olive oil has enhanced the demand for this product and, consequently, the expansion of olive tree cultivation. Although it is considered a highly resilient and tolerant crop to several abiotic stresses, olive growing areas are usually affected by adverse environmental factors, namely, water scarcity, heat and high irradiance, and are especially vulnerable to climate change. In this context, it is imperative to improve agronomic strategies to offset the loss of productivity and possible changes in fruit and oil quality. To develop more efficient and precise measures, it is important to look for new insights concerning response mechanisms to drought stress. In this review, we provided an overview of the global status of olive tree ecology and relevance, as well the influence of environmental abiotic stresses in olive cultivation. Finally, we explored and analysed the deleterious effects caused by drought e. The olive tree Olea europaea L.


Drought Stress Effects and Olive Tree Acclimation under a Changing Climate

Olive trees Olea europaea L. This species has developed a series of physiological mechanisms, that can be observed in several plants of the Mediterranean macchia, to tolerate drought stress and grow under adverse climatic conditions. These mechanisms have been investigated through an experimental campaign carried out over both irrigated and drought-stressed plants in order to comprehend the plant response under stressed conditions and its ability to recover. Experimental results show that olive plants subjected to water deficit lower the water content and water potentials of their tissues, establishing a particularly high potential gradient between leaves and roots, and stop canopy growth but not photosynthetic activity and transpiration. Active and passive osmotic adjustment due to the accumulation of carbohydrates in particular mannitol and glucose , proline and other osmolytes have key roles in maintaining cell turgor and leaf activities. At severe drought-stress levels, the non-stomatal component of photosynthesis is inhibited and a light-dependent inactivation of the photosystem II occurs. Finally, the activities of some antioxidant enzymes involved in the scavenging of activated oxygen species and in other biochemical pathways increase during a period of drought.

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