INTERACTION OF GIBBERELLIC ACID AND INDOLE‐ACETIC ACID IN THE DIFFERENTIATION OF WOUND VESSEL MEMBERS

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Abstract
Summary: Sucrose‐agar media supplemented with indole‐acetic acid (0.05 ppm) and gibberellic acid (0.05 or 0.5 ppm) increased the formation of wound vessel members in transverse tissue slices excised from the second internode of Coletis blumeni (Bentb.) stems. The treated tissue slices showed the initiation of cambial activity, whorls of wound vessel members in the cortex, and adventitious root formation after prolonged incubation. Also, incompletely differentiated secondary xylem cells and wound vessel members were observed which exhibited relatively thin secondary wall striations, and stained weakly with phloroglucinol‐HCl and Safranin O.