Effect of PAG and HT on root elongation under Se(IV) stress.

<p>(A) The roots were exposed to PAG (50, 100, and 200 µM) or HT (100, 200, 400 µM) for 72 h. After that, the root elongation was measured. <i>Asterisk</i> indicates that mean values of three replicates are significantly different between the treatments of Se(IV) and the control group (CK) (<i>P</i><0.05). (B) The roots were treated with water, 0.5 mM of NaHS, 100 µM of PAG, and 200 µM of HT alone or their combinations. After various treatments for 72 h, the root elongation was measured. <i>Asterisk</i> indicates that mean values of three replicates are significantly different between different treatments indicated.