Effects of gibberellic and abscisic acids on germination and seedling growth of okra (Abelmoschus esculentus L.) under salt stress
2019
Yakoubi, Fatima | Babou, Fatima Zohra | Belkhodja, Moulay
This study aimed to evaluate the effect of gibberellic acid (GA₃) and abscisic acid (ABA) on the germination of okra seeds (Abelmoschus esculentus L.) exposed under salinity constraint. In the first part, seeds were germinated in hormonal solutions of GA₃ (5 μM and 10 μM) and ABA (5 μM and 10 μM), in the presence of NaCl (100 mM). Results showed that NaCl reduced significantly the precocity of seeds germination without influencing its final rate; contrarily, it had a negative effect on hypocotylar growth, fresh weight and seedlings water content. The application of GA₃ treatment attenuated the depressive effect of NaCl on germination by stimulating it from the first day of sowing (after 24 h) with 20% and 26.66% under the effect of 5 μM and 10 μM of GA₃ respectively. The findings showed that, this phytohormone seemed positively influencing the hypocotylar length, fresh and dry weight as well as the water content of the okra seedlings. On the contrary, ABA was not effective in inducing tolerance to salinity.
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