Study of different laser radiation dosages on germination characters and yield of oilseed rape (Brassica napus L.) under salinity conditions

After it is confirmed that laser beam may affect plant traits, nowadays this physical factor is widely used as a suitable abiotic stimulator in scientific research studies. In the current investigation, the influence of three laser irradiation levels (red, Infra-red and Nd:YAG) at two different dosages (one and two times laser radiation for 18 seconds each time) on germination traits and yield of canola (Brassica napus L.) was studied under different NaCl concentrations (0, 100, 200 and 300 mM NaCl). The study was conducted as a factorial experiment based on completely randomized design with three replications in 2009. Final germination percentage (FGP), mean time for germination (MTG) and mean daily germination (MDG) and final yield were recorded. All germinations and yield significantly increased with irradiation by laser beam. Non-irradiated seeds were considered as the control treatment. Study results showed significant diffrences between irradiated seeds and control ones in terms of germination characteristics and plant yield. The Nd:YAG laser irradiation had the highest effect on the germination characters and yield compared to the red and infrared laser at either dosages and averagely twice application of laser irradiations caused a significantly higher germanations and yield compared to one application. Results indicate the positive impact of laser beam irradiation for canola tolerance to salinity.