Abstract
Summary Zizyphus normal stem tissue extract destroyed IAA when the two were incubated together. On the other hand, with gall tissue extract, IAA destruction occurred only following a lag period which was induced by auxin protectors detected in the gall tissue. The in vivo gall tissue showed no peroxidase and little IAA-oxidase activity for the incubation period tested. Polyphenol oxidase activity and total and O-dihydroxyphenols increased with the growth of the gall up to the 30th day. The protector-induced lag in IAA destruction was decreased when higher concentrations of IAA were used in the reaction mixture. Both normal and gall tissues were exposed to effectors such as NAA, IAA, 2,4-D, DL-tryptophan, gibberellic acid, and cycloheximide, each added separately. A differential response of normal and gall tissues to the different growth regulators in terms of activities of peroxidase, IAA oxidase and polyphenol oxidase was esthablishcd. A general tendency towards a decrease in polyphenol oxidase and an increase in peroxidase and IAA oxidase activities was observed in gall tissue. Both in vivo and in vitro gall tissue showed a higher protein content as compared to normal tissue.
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