Amelioration of the Growth, Yield and Chemical Constituents of Canola Plants Grown under Salinity Stress Condition by Exogenous Application of Proline

Two field experiments were carried out in the Research Farm of Faculty of Agriculture, Cairo University, Wady El-Notron Province, El Behaira Governorate, Egypt, during two successive winter seasons of 2012-2013 and 2013-2014 to study the effect of different concentrations of proline on growth parameters, yield and yield attributes and some chemical constituents of canola under saline conditions. The results showed that plant height, number of leaves.plant-1, number of branches.plant-1 and dry weight.plant-1 were significantly affected by increasing the proline concentration from 0 to 100 µM. Increasing proline concentrations from 0 to 100 µM with both varieties Serw 4 and Serw 6 significantly increased all yield attributes as compared with control plant (0 proline) except number of seed.siliqua-1, 1000-seed weight and seed yield.plant-1. However, Serw 6 with 75 µM proline concentration records the highest values of number of siliqua.plant-1, 1000-seed weight, seed yield.plant-1, seed and biological yield.ha-1, while the highest recorded values of plant height and number of seed.siliqua-1 were recorded at 100 µM proline with Serw 6. Serw 4 + 50 µM of proline records the highest values of Ca, Mg, K, Na and Fe. Also, proline application at 50 µM with the same variety records the highest value of protein per cent, while the highest seed oil content recorded by Serw 4 + proline concentration at 75 µM.