Investigation Of hydropriming effects on some germination and growth characteristics of Echium amoenum L. under laboratorial conditions

Seed hydro priming is a physiological technique that will reduce the time between water absorption and seed germination. In this research, a factorial experiment in completely randomized design with 3 replicates was performed in the laboratory of azad university of varamin for evaluating hydropriming effect on germination and growth indicators of echium amoenum. Treatments were consisted of priming seeds by distilled water in 5 temperature levels of 5 c, 9 c, 12 c, 15 c, 18 c and 21 c and 5 timing levels of 6h, 10h, 14h, 18h and 22 hours. Hydro primed seeds was evaluated by both standard germination and accelerated aging test. In the standard germination test treating at 12 c for 6 hours had a significant improvement for germination percentage and mean daily germination. On growth traits, treating at 18 c for 14 hours had a maximum length and dry weight of radical and seedling. However maximum length and dry weight of plumule was seen in treating at 9 c for 14 hours. In the accelerated aging test, high temperature and humidity damaged on all germination and growth characteristics of echium amoenum. However priming with the highest temperature had improve the viability and seed vigor. Thus treating at 21 c for 6 hours was the superior treatment for improving germination indicators. And treating at 21 c for 18 hours was the superior treatment for improving the growth index. Thus in use of priming, understanding the impact of temperature and time, has a considerable impact on test results.