Effect of morphactins, TIBA and ethrel on the wood anatomy of Hibiscus lasiocarpus (Malvaceae)
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The morphactins IT-3456 and hydroxyfluorene carboxylic acid; TIBA and ethrel were found to affect the normal development of the wood of Hibiscus lasiocarpus Cav. In all cases the process of xylogenesis was affected throughout the stem. The reduction in size of the vessel elements caused by IT-3456, TIBA and ethrel was so dramatic that their width, at the treatment areas, is close to that of the fibers. The morphactin hydroxyfluorene carboxylic acid caused a complete inhibition of the vessel element production at the treatment point. This inhibition was temporary and vessel element production was restored after a period of time. Except for TIBA, all the substances tested affected the apical meristems of the stems. IT-3456 and ethrel had an inhibitory effect while hydroxyfluorene carboxylic acid had a promoting effect in the growth in length of the experimental stems. In all cases the development of non-especialized cells like those of the parenchyma tissue was disrupted. The main targets of these substances seem to be the apical and lateral meristems of the stem as well as, any other non-especialized cell present.
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