Growth response of two young pistachio (Pistacia vera L.) rootstock seedlings to boron excess in irrigation water under a soilless culture system
2015
Arzani, K. | Hokmabadi, H.
In order to explore and determine the effects of Boron excess in irrigation water on growth response of pistachio (Pistacia vera L.), one-year-old rootstock seedlings were used. Seeds of two pistachio cultivars ‘Badami-e-zarand’ and ‘Ghazvini’ were collected from the Pistachio Research Institute (PRI) collection orchard in 2001 growing season and sown after 40 days of cold storage at 4°C. One year old grown seedlings were used for this experiment as rootstock seedlings during 2002 growing season. Boron at the concentrations of 0, 20, 40, 60 and 80 mg L-1 was applied at three days intervals in the sand culture and irrigation system using half-strength Hoagland nutrient solution. The response of pistachio rootstocks seedlings to applied treatments were evaluated at 14 day intervals with leaf water potential (Ψleaf), leaf temperature, stem diameter and plant height and leaf chlorophyll florescence measurements. In addition, the mineral content of the leaves, stem and roots was recorded at the end of experiment. Results showed that two months after treatments started with increasing of boron concentration more than 60 mg L-1 whole plant biomass, leaf area and plant height decreased. Leaf water relations and gas exchange of seedlings were not affected by applied treatments, although leaf nitrogen content of treated plants was lower than in the control. In addition, the concentration of leaf, stem and root Mg, K and P was not affected by applied treatments in comparison with the control, but the amount of Ca was decreased. The reduction of Ca was higher in the leaves and roots than in the stem of treated plants. In conclusion, ‘Badami-e-zarand’ rootstock showed better growth response to Boron excess in irrigation water under soilless culture system.
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