somayyeh bayat and ali sepehri * department of agronomy and plant breeding, faculty of agricultre, bu-ali sina university of hamedan, iran *corresponding author: e-mail. sepehri2748@gmail.com, a_sepehri@basu.ac.ir received: 31 may 2012 accepted: 8 october 2012 abstract growth and yield of maize is seriously restricted by water deficit. salicylic acid (sa) and paclobutrazol )pbz) indu...