Is arcA3 a possible mediator in the signal transduction pathway during agonist cell cycle arrest by salicylic acid and UV irradiation?

Progression of BY-2 tobacco cells through the cell cycle was followed after treatments with ultra violet (UV) and salicylic acid (SA) used as a potent inhibitor of the octadecanoid pathway which can mediate response to UV irradiation. Cells in S phase were more sensitive than G0/G1 or G2 cells to UV irradiation. Although SA efficiently blocked cells in G0/G1 or G2, it did not block S phase synchronized cells.