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Nutrient Stress, Ecophysiological, and Metabolic Aspects of Olive Tree Cultivars

Saidana, Dhouha, Braham, Mohamed, Boujnah, Dalenda, Ben Mariem, Fathi, Ammari, Salwa, Ben El Hadj, Salem
Journal of plant nutrition 2009 v.32 no.1-3 pp. 129-145
Olea europaea, olives, cultivars, plant nutrition, plant stress, nitrogen, phosphorus, magnesium, potassium, nutrient deficiencies, hydroponics, leaf area, dry matter accumulation, stomatal conductance, stomata, chlorophyll, starch, carbohydrate metabolism
This research, aimed at evaluating stress on the olive tree, utilized cultivars 'Meski' and 'Chetoui' in regards to the removal of major elements such as nitrogen (N), phosphorus (P), magnesium (Mg), and potassium (K). The experiment was conducted under greenhouse conditions in hydroponics culture. Measurements of leaf area showed a non-substantial and weak effect due to phosphorus, potassium, or magnesium deficiency compared to nitrogen. The growth analysis of dry matter showed an early depressive effect of nitrogen deficiency and a similar, but less important effect concerning phosphorus. The induced nutritional stresses showed an important increase in stomata resistance, caused primarily by nitrogen or potassium deficiency, accompanied by a reduction of chlorophyll concentration, which resulted from the removal of phosphorus, magnesium, and mainly nitrogen supply. Remarkable starch synthesis and storage was also revealed following nitrogen deficiency, but it was very weak after the suppression of magnesium, which may provoke a weakening of growth and development of these plants.