ORIGINAL ARTICLE

Transcriptomic VvPHO1 Gene Profiles Relation with Abscisic Acid (ABA) and Salicylic Acid (SA) in Grapevine (Vitis vinifera L.) under Salt Stress

Expression profile of VvPHO1 gene, abscisic acid (ABA) and salicylic acid (SA) were investigated in Baladi grapevine cultivar and B41 grapevine rootstock after different times (24, 48, 72 and 96 hours) of exposure to 2 dS/m sea water (SW). Quantitative RT-qPCR test revealed that the VvPHO1 gene, showed up-regulation from 0.27 to 2.61-fold in Baladi cv. and from 0.5 to 6.1-fold in B41 rootstock when exposure time increased from 24 to 96 h. Moreover, SW treatment caused decrease in total ABA content from 419.15 to 128 ng/g (3.274 fold) in Baladi cv. and from 1674.95 to 1559 ng/g (1.074 fold) in B41 rootstock when exposure time increased from 24 to 96 h. As for total SA, this parameter followed inverse tendency in Baladi cv. and B41 rootstock; it decreased from 126.45 to 25.6 ng/g (4.94 fold) in Baladi cv. and increased from 9.54 to 147 ng/g (15.41 fold) in B41 rootstock when exposure time increased from 24 to 96 h. Overall, data showed that VvPHO1 transcript pattern was closely related with SA level in B41 rootstock; referring that SA phytohormone could be implicated in VvPHO1 genes pathway mediates salt tolerance in grapevines.