uxin inactivation pathways
Many auxin storage forms can be converted back to the active auxin IAA. However, some storage forms appear to comprise an IAA inactivation pathway and cannot be con- verted back to active IAA (Fig. 4). These modified auxin forms are hypothesized to protect against auxin toxicity in the presence of excess auxin (Cohen and Bandurski, 1982; Woodward and Bartel, 2005). Auxin detoxification is carried out via an IAA catabolic pathway for irreversible modifica- tion of IAA.