In their natural environment, plants are subjected to a large number of environmental constraints of a biotic and an abiotic nature that will influence their growth and development (MAAROUF and RAYNAUD, 2007). Soil salinity is one of the major abiotic factors limiting agricultural production in arid and semi-arid regions (Koca and al., 2007, DONG and al., 2009) affecting more than 80 million ha of arable land worldwide (FAO, 2008). This salinity is due to the presence of high amounts of minerals such as Na + and Cl- in soils and water (TAVAKKOLI and al.,2010,XXXXX) .Algeria is among the threatened countries with 3.
2 million ha that are affected by salinity (Szablocs 1989, Belkhodja and Bidai 2004).Germination is considered as a critical step in plants development cycle. Indeed, it conditions the seedling’s installation, its adaptation to the environment and its subsequent productivity (Kaur and al., 1998, Bahrani 2015, ZHU, 2016).
Salinity generally reduces germination in both glycophytes (Siddiqui and al., 2006, Bia?ecka and K?pczy?ski, 2009, Ndiaye and al., 2014) and halophytes (Debez and al., 2004; XXXXXX;Gul and al., 2013). For that, the search for treatments that can reduce the effect of salinity during this phasis will be essential.
In the last two decades, physiological treatments such as hormone inputs have been intensively studied, assuming that the depressive effect of salinity on germination could be related to either a decrease or an increase in endogenous hormone levels (Debez and al. , 2001, Fusun and al., 2004; XXXXXX).Among the main phytohormones regulating the process of seeds germination is abscissic acid and gibberellins (XXXX.Graeber et al., 2012, Shu et al., 2016b, Nee and al., 2016) .
Wang and al. (2001) and Zhang and al. (2006) have clearly defined that abscisic acid (ABA) increases in response to salinity while it has been found in parallel that salt stress induces a reduction of GA3 levels thereby preventing embryonic expansion and lifting the dormancy (Atia and al., 2009, Cao and al., 2014) .
As a result, the application of GA3 can play a central role in plant responses to salt stress especially in the early stages of development (Khan and al. Gul., 2006; XXXXXX;Iqbal and Ashraf, 2013).Liopa-Tsakalidia and al.
(2012) showed that hormone supplementation of GA3 increases germination rate and seedlings growth, and provides an interesting approach to counter the effects of salt stress.In our knowledge very little work is conducted on the behavior of okra (Abelmoschus esculentus L.) and therefore the objective of this work is to analyze the effect of gibberellic acid (GA3) and abscissic acid (ABA) on the process of seeds germination of this specy subjected to salinity constraint.