Saeedeh moradi; ahamd golchin; Ebrahim sepehr; mosayeb vafaee
Abstract
The effects of salinity and boron content of irrigation water on growth and micronutrient concentrations of purslane plant were studied. The growing population of the world and increasing demand for food has led to the unavoidable utilization of saline soils for crop production. Purslane is an annual ...
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The effects of salinity and boron content of irrigation water on growth and micronutrient concentrations of purslane plant were studied. The growing population of the world and increasing demand for food has led to the unavoidable utilization of saline soils for crop production. Purslane is an annual herbaceous plant that grows well in saline soils. Boron (B) is an essential element for plants and may exist in toxic concentrations in saline soils, but the plants require it in small amount. To evaluate the effects of salinity and B levels of irrigation water on the yield and micronutrient concentrations of purslane plant, a factorial experiment with a completely randomized design in three replications and 35 treatments was conducted in greenhouse condition. The irrigation water had the salinity levels of 0.5, 2.5, 5.0, 10.0, 15.0, 20.0 and 25.0 dS/m and boron contents were 0, 0.5, 0, 1, 2, and 4 mg/liter. The results showed that the highest dry weight for aerial parts (1.29 gr) and root (0.24 gr) and the highest plant height (31.16 cm) and concentration of copper (29.1 mg. kg-1) in aerial parts were measured for the treatments irrigated by water with the salinity level of 0.5 dS/m and boron level of 0 mg/L. The highest concentration of iron (93.65 mg. kg-1) in aerial parts was measured for the plants irrigated by water with the salinity level of 10 dS/m and boron concentration of 0.5 mg/L. The highest concentration of zinc (64.26 mg. kg-1) in aerial parts was measured for the treatments irrigated by water with the salinity level of 2.5 dS/m and boron level of 2 mg/L. The highest concentration of manganese (98.26 mg. kg-1) in aerial parts was obtained from the treatments irrigated by water with the salinity level of 0.5 dS/m and boron level of 2 mg/L. In general, the results of this study indicate that for obtaining high yields of purslane plant, the salinity level of irrigation water should not be higher than 2.5 dS/m and the boron level should be less than 0.5 mg/L.
N A; A R
Abstract
In order to investigate the effect of salinity on morphological, physiological and biochemical characteristics of Lisianthus, a pot experiment was conducted hydroponically in sand. Two Lisianthus varieties (‘Champagne’ and ‘Pure White’) and four NaCl concentrations (0, 20, 40, ...
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In order to investigate the effect of salinity on morphological, physiological and biochemical characteristics of Lisianthus, a pot experiment was conducted hydroponically in sand. Two Lisianthus varieties (‘Champagne’ and ‘Pure White’) and four NaCl concentrations (0, 20, 40, 60 mM) were combined factorially based on a complete randomized design with four replications. The result showed that as salinity increased plant height and fresh and dry weights decreased. Also, chlorophyll a content, photosynthesis rate, and relative water content of plants treated with 60 mM NaCl were, respectively, 31%, 62%, and 20%, lower than the controls. In addition, root length increased with increasing salinity, so that in plants treated with 60 mM NaCl root length was 43% larger than the controls. Further, electrolyte leakage and Malondialdehyde (MDA) content increased with increasing salinity. Results revealed that dry weight, plant height, and photosynthesis rate in ‘Pure White’ were, respectively, 47%, 27%, and 31% higher than in ‘Champagne’. Moreover, under salinity stress, ‘Pure White’ could maintain better morphological and physiological characteristics, i.e. plant height, dry weight, relative water content and cell wall stability compared with ‘Champagne’.