Mommad Hadi Rad; Mehdi Soltani; Mostafa Zare Mehrjerdi; Mahdieh Tajamolian
Volume 21, Issue 4 , March 2015, , Pages 620-630
Abstract
Despite the high resistance of black saxual (Haloxylon aphyllum) to environmental stress such as drought, there is the possibility of further resistance in different populations. This experiment was carried out to determine the drought tolerance in seven populations of black saxual(Yazd, Esfahan, Semnan, ...
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Despite the high resistance of black saxual (Haloxylon aphyllum) to environmental stress such as drought, there is the possibility of further resistance in different populations. This experiment was carried out to determine the drought tolerance in seven populations of black saxual(Yazd, Esfahan, Semnan, South Khorasan, Sistan va Blochestan, Kerman) under three moisture treatments (100%, 50% and 25% of field capacity) using small weighing lysimeters. The study was conducted in Yazd Shahid Sadoqi Research Station during 2010-2012 using a randomized complete block design with three replications. The effects of soil moisture treatments were studied on morphological traits such as shoot dry weight, root dry weight, root to shoot ratio and physiological traits such as leaf and root osmotic potential, relative water content, water use efficiency, total chlorophyll, chlorophyll a, chlorophyll b, Na+ and K+ accumulation in roots and shoots. According to the results, no significant differences were recorded among the populations in response to the moisture treatments except chlorophyll content (P<0.05). The effect of moisture treatments on water use efficiency and physiological traits such as leaf osmotic potential, relative water content of leaves, total chlorophyll, chlorophyll a, chlorophyll b and Na+ in the root were significant (P<0.01). In addition, the effect of moisture treatments on leaf potassium was significant (P<0.05). Drought stress had no significant effect on other traits, including root osmotic potential, leaf Na+ and root K+. Effects of drought stress on morphological traits including shoot dry weight, root dry weight, total dry weight, and root to shoot ratio were significant (P<0.001). The interaction effects of population and moisture treatments on morphological characteristics were not significant.
Mohammad hadi Rad; Mohammad ali Meshkat; Mahdi Soltani
Volume 16, Issue 1 , December 2009, , Pages 34-43
Abstract
The effects of drought stress on some saxual‘s (Haloxylon aphyllum) morphological characteristics was studied by weight and drainage lysimeters from 1380 to 1384 in yazd Shahid-Sadughy desertification research station. The moisture treatments included pot capacity (control), one-third pot capacity ...
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The effects of drought stress on some saxual‘s (Haloxylon aphyllum) morphological characteristics was studied by weight and drainage lysimeters from 1380 to 1384 in yazd Shahid-Sadughy desertification research station. The moisture treatments included pot capacity (control), one-third pot capacity and drought that carried out in randomize complete block design (RCBD) with three replicate. After the control of soil moisture, the moisture treatments were irrigated, on the other hand after seedling establishment in drought treatment irrigation was stopped. The moisture treatments were carried out in two growth season and its effects on morphological characteristic such as height, crown diameter, canopy cover volume, leaf length, number of ties in leaf length unit and canopy cover weight was studied. The results showed that the amount of soil moisture were not significant on height, canopy cover volume and number of ties in leaf length unit, but it had significant effects on crown diameter (p=0.030), leaf length (p=0.010) and canopy cover weight (p=0.004).
Mohammad Hadirad; Reza Mir hoseini; Mohammad ali Meshkat; Mahdi Soltani
Volume 15, Issue 1 , January 2008, , Pages 51-58
Abstract
Weighting lysimeters are good instruments and direct method to plants water needs (evapotranspiration) in arid zones. This research practiced at Yazd Shahid-Sadooghi Desert Research Station. Ten galvanized iron lysimeters (120 cm. diameter & 170 cm. high) were made and constructed after covering ...
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Weighting lysimeters are good instruments and direct method to plants water needs (evapotranspiration) in arid zones. This research practiced at Yazd Shahid-Sadooghi Desert Research Station. Ten galvanized iron lysimeters (120 cm. diameter & 170 cm. high) were made and constructed after covering with a glass-wool layer to minimize the effect of the environment temperature variation on them. Four hatchways installed at different depths (30, 60, 90 and 120 cm) of lysimeters for root and soil sampling and estimating of soil moisture content by TDR instrument. These containers became full with disturbed local soil (l.s tex.), planted and irrigated respectively at the beginning. Lysimeters weighted by a portable liftract which was linked to a powerful (5000 kg. capacity) and accurate (0.1 % sensitivity degree) balance. Drainage water also collected from outlet tubes below of lysimeters occasionally. Results has shown that this procedure have had a good efficiency because achieving to objectives of this research was available. Saving and analyzing of information by computer and with change of weighting method, would also be probable in the future.