Effects of Different Levels of Salinity on Germination, Proline Contents and A-, B- Chlorophylls in Rapessed (Brassica napus L.)

ABSTACT: Soil salinity is a major limitation for crop production in many areas of the world. Germination and seedling responses of nine rapeseed cultivars (Hayola 401, Zarfam, Sarigol, Rgs003, L3006, Lph9, Lph12, Lph22 and Lph23) to different levels of salinity stress (0, 100, 200 and 300 mM) evaluated in a RCBD base on factorial experiment with three replicates in glasshouse. Results showed that the germination of rapeseed cultivars were significantly affected by salinity. Cultivars Sarigol and Lph23 exhibited the highest and the lowest germination under salinity stress conditions. Amount of total chlorophyll, chlorophyll a and b were significantly reduced by increasing salinity. The results showed that increasing salinity levels significantly reduced chlorophyll a and b. Sarigol showed the most decrease in the amount of total chlorophyll. Leaf and root proline content of cultivars have been significantly increased by increasing the NaCl level, so that, the most increasing was happened using 300 mM NaCl treatments