Abstract
The effect of osmopriming on lettuce achene invigoration at supra optimal temperature (35ºC) was investigated in
the present study. Osmopriming of lettuce achene with KNO3 (0.25%, 0.5% and 1%), CaCl2 (15 mM, 25 mM, 50
mM) and PEG 8000 (0.1 g/ml H2O, 0.2 g/ml H2O, 0.3g/ml H2O) alleviated thermodormancy and improved lettuce
achene’s vigor. Moreover, priming significantly improved final germination % age, energy of germination,
germination index, shoot length, root length, vigor index and reduced mean germination time and time taken to
50% germination, as compared to control, when seeds were subjected to supra-optimal germination
environments. It can be concluded that osmopriming can act as effective tool to invigorate lettuce seeds at supra
optimal temperature
