Abstract
The optimal concentration of IAA (0.03 mM) for tracheary element differentiation on lettuce pith explants was about ten times greater than the optimal concentration for callus proliferation. Related to this, the mean volume per tracheary element increased with increasing IAA concentration, 18-fold between 0.001 mM and 0.3 mM IAA. At the highest concentrations, some pith cells appeared to differentiate directly into tracheary elements, without cell division, resulting in especially large tracheary elements (...)
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