Effect of salicylic acid and gibberellic acid pre-treatment on accumulation of some ions and germination indices in canola (Brassica napus L.) under salt stress condition
Subject Areas : agronomy
Mahta
Haghjoo
1
(Islamic Azd University, Ramhormoz Branch)
Abdollah
Bahrani
2
(Islamic Azad University, Ramhormoz Branch,)
Keywords: germination, Salinity, Canola, Hormones, seedling,
Abstract :
high germination rate and vigorous early growth under salty soils is preferred. In this study germination and seedling growth of a canola (Brassica napus L.) cultivar (Hayola 401) was assessed using in a factorial laid out in three separate experiments as Completely Randomized Design (CRD) testing combinations of four levels of salinity (0, 80, 160 and 240 mMol NaCl) and three levels of salicylic acid (0, 0.5 and 1 m gr Lit) in the first experiment, the same salinity levels with four levels of gibberellic acid (0,1.5, 3 and 4.5 m Mol) in the second experiment and the same salinity levels with four levels of abscisic acid (0, 2, 4 and 6 m Mol Lit) in the third experiment. Results showed that germination percentage and germination rate was significantly increased by salicylic acid (SA) and gibberellic acid (GA) under salinity conditions compared to non-treatment of these two hormones. Priming with SA could not improve radicle length and radicle dry weight in all salinity levels. Application of GA enhanced radicle and hypocotyl length in all salinity levels compared to untreated seeds with treatment. ABA decreased germination percentage to about 12 % in 2 m Mol than control. Priming with ABA could not improve radicle length in all salinity levels. Seeds primed with ABA improved dry weight of seedlings as compared to non-treatment of ABA under non salinity and salinity conditions. In general, tolerance to salinity in canola seed increased with SA, GA and ABA compared to control.
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