Figure 11.—

Hypothetical model for ILR3 regulation of metal homeostasis and IAA-conjugate metabolism. (A) In wild-type plants, ILR3 may repress expression of the Ccc1p-like metal transporters, which helps maintain proper ion homeostasis and normal ILR1 hydrolase activity and conjugate responses. (B) CCC1-like gene expression is reduced in the ilr3-1 mutant, altering ion homeostasis, which reduces ILR1 activity, resulting in reduced conjugate responses. (C) Plants lacking ILR3 (ilr3-2) and close homologs may insufficiently repress CCC1-like expression, causing increased ILR1 activity and increased conjugate responses.