Figure 10.

Proposed Model for BR-GA Crosstalk Based on This Study.

(A) Physiological BR induces GA biosynthesis, inhibits GA inactivation, and stimulates self-biosynthesis to promote cell elongation. As a feedback manner, GA inhibits BR responses and biosynthesis. BR also has other branches for promoting cell elongation or other specific actions.

(B) High BR levels promote GA inactivation and repress self-biosynthesis to inhibit cell elongation. High GA levels facilitate cell elongation via BR signaling.

Arrows indicate activation, and blunt arrows indicate inhibition.