Expression of some genes involved in ABA signaling pathway in halophyte Aeluropus littoralis under salinity stress

The objective of the present study is to investigate the response of halophyte Aeluropus littoralis to salinity stress. This experiment was conducted in three levels of treatments containing control (without salt), 200 and 400 mM NaCl with three replications for each.  The changes were measured at 6 and 24 h after applying salt treatment. The results showed that the soluble sugar content increased with increasing time and NaCl concentration, So thatو This increase was observed at both treatment after 24h and only at 400 mm after 6h salt stress. Also, The proline content also increased significantly in the both concentrations at the 24 h compared to the 6 h after salt stress. On the other hand, protein content  at 6 h and 200 mM concentration was no significant different, but there was a significant decrease in protein content at 400 Mm treatment at the same time. in contrast, the protein content was significantly decreased both concentrations at 24 h. The results of relative gene expression analysis showed that PYL gene expression was strongly affected by salinity stress and showed a significant decreasing trend (p <0.05). So that, the rate of this reduction at 6 hours is much higher than at 24 hours. ABF gene expression generally showed an increasing trend, which increased significantly in both treatments at 24 h. Therefore, it can be stated that soluble sugars and proline as adaptive compounds in response to salinity stress in Aeluropus littoralis plant and abscisic acid signaling pathway are strongly affected by salinity stress