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Abstract
Generally native genotypes of Olives have different reaction against drought stress. The current research was conducted in order to determine the metabolic index under drought stress conditions in olive cultivars (Nabali, Gordal, Arbequine, Zard, Roghani and Feshomi). It was designed on a RCBD experiment based on factorial with full irrigation and drought stress treatments in three replicates. The evaluated parameters in this research were several metabolic solutions, including, sucrose, starch, proline, and betaine. There were significant differences between control treatment and drought stress in different cultivars for the evaluated parameters. The amount of sucrose in three continual experiments showed significant differences between two control treatments and drought stress. Highest Sucrose was measured in Gordal (40.83 mg/g-1) and lowest amount was measured in Roghani cultivar (18.88 mg/g-1) in the fresh weight samples. Sucrose content increased under drought stress intensity and starch content decreases under water stress condition (20.83 and 37.75 mg/g-1 respectively). Proline content increased under drought stress conditions in the cultivars which is Nabali; 12.33 and Arbequine; 9.64 Micro mol/g-1 in the fresh weight samples respectively), however, it’s the reason for differences of physiological and bio-chemical behaviors in these cultivars. Betaine content increased under water stress conditions (101.342 Micro mol/g-1 in fresh weight samples), so far that contrary to the metabolic solutions betaine is not quickly metabolized after drought stress and it may be considered as an indices of previous stress inside the plant, and it could be concluded that Gordal and Nabali were the best cultivars compared to Arbequine, Zard, Roghani and Feshomi due to drought resistance levels. Keywords: Olive –Drought Stress –Proline–Trehalose –Betaine
Highlights
From economic points of view water is considered as a very important resource in most parts of the world, in arid and semi-arid areas and nations have always been suffering from the risks of water shortages
In this study it was specified that under drought stress conditions the amount of sucrose has been increased and it has been significant from statistical points of view
Increase of sucrose in Gordal, Nabali and Arbequine cultivars has been more than other cultivars respectively
Summary
From economic points of view water is considered as a very important resource in most parts of the world, in arid and semi-arid areas and nations have always been suffering from the risks of water shortages. Physiological and biochemical processes of these plants are capable to endure stress mechanism (Wang and Stutte, 1992). Temperature is another important environmental factor for enzyme synthesis (Balaji and Ebenezer, 2008 ). Accumulations of compatible osmolits to regulate osmosis reduce the osmotic potential and allow the cell to absorb more water from environment. It will have quick compensation effect on water deficit in living creatures (Ramanjula and Sudhakar, 2000). Decrease of osmotic potentials up to –6 MPa is reported in two cultivars of Koroneiki and www.indjst.org 41
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