Abstract
Excised watermelon cotyledons were treated with benzyladenine (BA) or fusicoccin (FC), both at 10 −5 M concentration. The effects of the two growth regulators were compared by monitoring the time course of the following parameters: growth (increase in fresh wt.), carotenoid and lipid content and the activities of cytochrome oxidase and hydroxypyruvate reductase (HPR). The treatment with FC induces a large growth response, of the same order of magnitude as that observed with BA. All other developmental responses that are strongly stimulated by BA are little or not-at-all affected by FC. These results indicate that growth by itself is not sufficient to entrain the other developmental responses induced by BA. On the other hand BA can partially enhance carotenoid content and HPR activity even when expansion growth is completely suppressed by osmotic stress.
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