الفهرس 
Effect of selenium and boron on growth, yield and chemical constituents of canola plant (brassica napus l.) grown under salt stress conditions
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Abstract
Salinity is a major factor that influences rapeseed production. Canola is now the third most important source of edible oil in the world. Selenium and boron are required by plants in small quantities that involve several physiological and biochemical processes in plants and enhanced salt tolerance of plants. This study was carried out at the Department of Ornamental Horticulture, Faculty of Agriculture, Cairo University. The experiments were conducted at the National Research Centre, Dokki, Cairo, Egypt during the two successive seasons of 2012/2013 and 2013/2014 to evaluate the effect of salinity (0, 2.5, 5 and 7.5 dS m-1), selenium (0, 2 and 4 mg Se l-1 as sodium selenat) and boron (0, 2 and 4 mg B l-1 as boric acid) and their interactions on growth, yield and chemical constituents of canola plant. The results showed that the lowest level of salinity (2.5 dS m-1) resulted in the maximum values of plant height, number of branches, number of leaves, number and weight of siliquae, leaf area, herb fresh and dry weight, seeds weight, oil content, photosynthetic pigments, total soluble phenols, total free amino acids and protein as well as nitrogen, phosphorus, potassium, calcium and boron concentrations. Moreover, salinity at 5 dS m-1 recorded the greatest values of relative concentration of Oleic acid and Stearic acids. While, increasing salinity up to 7.5 dS m-1 gave the maximum values of relative concentration of Linoleic acid, cis-11-Eicosenoic acid and Erucic acid and produced the greatest concentrations of total sugars, proline, nitrate, magnesium and sodium. The addition of 2 mg l-1 of selenium combined with 4 mg l-1 of boron recorded the highest herb dry weight, siliquae weight, photosynthetic pigments and increased Oleic acid relative concentration