تاثیر سطوح مختلف تنش خشکی بر مراحل ابتدایی رشد گیاه خارشتر

The predicted worldwide increase of arid areas and water stress episodes will strongly affect crop production. Understanding of seedling responses to changes in water availability is essential for the vegetation restoration programs in arid regions. The objective of this project was to evaluate the effect of different water stress regimes on early growth stage of Alhagi. The greenhouse experiment was designed as a complete randomized design with five replications at the Iranian Research Organization for Science and Technology (IROST) in 2013. Four irrigation regimes were 100 (control), 80, 60 and 40% field capacity (FC). The results showed that the Alhagi seedlings died in sever water stress (40% FC) 10 days after water stress started. It was observed that 60 % FC was produced the lowest leaf number and total dry matter. The lowest value of plant height, number of branch per plant and number of leaf per plant was recorded in 60% FC and no significant difference was observed between 60% FC and control treatments. Dry matter produced in 80% FC did not differ with its in control treatment. However, dry matter decreased by 80%, in 60% FC treatment compared to control. Consequently, irrigation management for seedling establishment in Alhagi is really necessary.