Fig. 5.

Emasculation arrests flower growth that is rescued by bioactive GA₄ application. Male flower buds of developmental stage II (Fig. 3) were either left intact (A) or were emasculated (B). Eleven days after the treatment flowers are illustrated that developed from intact buds (C) or from emasculated buds treated either with water (D) or with an aqueous solution of GA₄ as described in the Materials and methods (E). Bar=1 cm.