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Maatallah S.,Institution of Research and Higher Education Agriculture IRESA | Nasri N.,University of Tunis | Hajlaoui H.,Institution of Research and Higher Education Agriculture IRESA | Albouchi A.,Institute National Of Recherche En Genie Rural Eau Et Forets | Elaissi A.,University of Monastir
Industrial Crops and Products | Year: 2016

The effects of water deficit stress on growth and essential oil yield and composition of Laurel ecotypes (Annaba and Bardo) were studied. The factors studied included two stress intensities of permanent stress: 60% (S1) and 20% (S2) of field capacity or to cyclic water stress, plants being re-watered when the soil moisture dropped to 60% (S11) or 20% (S22) of field capacity. The results of this experiment showed that Relative Growth Rate (RGR), Leaf Mass Area (LMA) and chlorophyll content decreased under water stress especially under severe stress S2. For both ecotypes, essential oil yield was reduced under water deficit stress but essential oil% increased under this condition. Eight six components were determined in essential oils, which were mostly oxygenated monoterpenes. The main components were found to be 1,8-cineol in two ecotypes. In Annaba, 1,8 cineol increased with permanent stress (S1 and S2) and diminished by 50% under cyclic severe stress (S22) but in Bardo, we note that 1,8 cineol increased with water stress, this increase was much higher under cyclic stress (S11 and S22). Water stress decreased the constituents of α-terpinyl acetate, Sabinene and linalool for Annaba. For Bardo, α-terpinyl acetate increased under water stress. © 2016 Elsevier B.V. Source

Maatallah S.,Institution of Research and Higher Education Agriculture IRESA | Maatallah S.,Tunis el Manar University | Guizani M.,Institution of Research and Higher Education Agriculture IRESA | Guizani M.,Gabes University | And 5 more authors.
Fruits | Year: 2015

Introduction. Drought can affect the qualitative and nutritional attributes of plum (Prunus salicina L.). The aim of this work was to study the effect of regulated deficit irrigation (RDI) on the quality of plum fruits. Materials and methods. Experiments were conducted during two consecutive seasons (2011-2012) with three cultivars ('Black Diamond', 'Black Gold' and 'Black Star') recently introduced in the region of Regueb (center of Tunisia) characterized by a semi-arid climate. During the fruit growth period, treated trees (RDI 50) received 50% of the irrigation water provided to the control (CI) for three months. Results and discussion.Water restriction reduced the diameter and weight of the fruit though the extent depended on the cultivar. However, other measures of fruit quality were improved for all cultivars with an increase of fruit firmness, pH, soluble solids and sucrose content, and a decrease of total acidity. Additionally, 'Black Diamond' fruit from treated trees had high level of total phenolics and flavonoids. Conclusion. Regulated deficit irrigation may save water in semi-arid regions and improve fruit quality with only moderate impact on productivity. © Cirad/EDP Sciences 2015. Source

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