The effect of osmo-priming on germination and seedling growth of Brassica napus L. under salinity conditions

摘要

This experiment was conducted to evaluate the effects of osmo-priming with KNO3 on the germination traits and seedling growth of two Brassica napus L. cultivars under salinity conditions. Seeds of two spring rapeseed ('Heros' and 'Eagle') were primed with KNO3 (-1.0 MPa) for 24 hrs in continuous 30 degrees C. Primed (P) and un-primed (NP) seeds were cultured in medium grade perlite and placed in greenhouse for 40 days. Pots were daily irrigated with nutrient solutions containing different levels of salinity (0.2, 5, 10, 15 and 20 dSm(-1)). Results showed that germination percentage of primed seeds was greater than that of un-primed seeds. Radicle length, seedling height and dry weight and leaf number of plants derived from primed seeds were higher compared with un-primed seeds. Na content of plants derived from primed seeds was higher than that of un-primed ones. In contrast, K content of priming resulted plantlets was comparatively higher compared with un-primed counterparts. It seems that salinity tolerance in priming resulted plantlets was due to higher potential of these plants for osmosis regulation.