Influence of Priming Treatments on Stress Tolerance During Seed Germination of Rice

摘要

In many crop species, seed germination and early seedling growth are the most sensitive stages to any stress. In order to evaluate the effect of different seed priming techniques on germination of paddy under different temperatures a factorial experiment was conducted with six varieties. Seeds were primed for 12h in seven priming media (salicylic acid 50 ppm, ascorbic acid 200ppm, citric acid 200ppm, proline 0.2%, calcium chloride 2%, Na_2HPO_4 100ppm and distilled water) at three different temperatures (30°C, 38°C and 43°C) to observe the germination and related parameters. Results indicated that an increase in heat stress decreased germination components such as germination percentage, speed of germination, root length, shoot length and vigourindex. Ascorbic acid and salicylic acid pre-treatment @ 200ppm and 50ppm respectively results in improvement of germination properties of paddy under heat stress condition because of its antioxidant capacity. The other treatments also enhanced the germination properties. Priming treatments including hydropriming resulted in the increased activity of alpha-amylase which in turn has resulted in better mobilization of stored carbohydrate reserves resulted in improvement of germination and other related parameters.