Figure 13.

A schematic model of NO signals acting downstream of SAY09-induced auxin to enhance Cd tolerance in Arabidopsis plants. SAY09 exposure could induce a great increase of auxin levels in roots with the subsequent stimulation of NO synthesis. The enhanced NO signals then activate diverse adaptive mechanisms such as enhanced cell wall-retained Cd and Fe acquisition, which confers increased Cd resistance of plants. Dashed arrows denote regulatory pathways. Red upright arrows denote a significant increase in content or effects.