Two pot experiments were performed during 2007 and 2008 seasons to study the effect of foliar application with benzyladenine (BA) at 20,40 and 60 ppm, putrscine (Put) and salicylic acid (SA) at 25,50 and 100 ppm for each on growth, yield and its components as well as on some chemical composition of sesame plant (varity shandawel 3). The obtained results indicated that the foliar application of benzyladenine (40 ppm), putrscine (100 ppm) and Salicylic acid (50 ppm) significantly increased all vegetative growth characteristics, i.e. stem length, number and leaf area / plant, dry weight of stems, leaves and capsules/ plant, net assimilation rate, fruiting zone length, number of flower and capsules per plant at 75 days after sowing. In addition, foliar application of these treatments significantly increased yield and its components , i.e. number of capsules per plant, capsules weight and seeds weight (g) per plant, weight of 1000 seeds (g) and seeds yield (g) per pot as well as seed oil yield per plant. Also, foliar application of BA at 40 ppm, Put at 100 ppm and SA at 50 ppm induced an increase in photosynthetic pigments (chlorophyll a , b and carotenoids) in leaves and minerals (N, P, K, Ca, Mg, Fe and Zn), total sugars and carbohydrates, total free amino acids and crude protein concentration in sesame leaves and seeds. Also, seed oil percentage and percentage of fatty acids composition of sesame oil were increased. Beside that, foliar application with all used bioregulators decreased the percentage of total saturated fatty acids, while induced an obvious increase in the percentage of total unsaturated fatty acids and unsaturated : saturated ratios of sesame seeds oil. In this concern, the foliar applications of BA at 40 and put at 100 ppm were the most effective concentrations on seed and oil yield of sesame plant. Finally, this study strongly admit the use of BA, put and SA at 40, 100 and 50 ppm, respectively for increasing seasme growth and productivity. |
