Enzymatic Maceration of Plant Tissue

Tissue cells of Vicia faba were separated from the leaf pieces by the pectinase treatment after which the chlorophyll determination method was employed. The separation proceeded at a constant rate for 3 hours', the maximum rate of separation was at pH 5.3. The optimal pH shifted to 5.5 in the presence of 0.001 M 2Na‐ethylenediaminetetraacetic acid (EDTA), which accelerated the separation at pH levels higher than 5.5. The separation was enhanced by NaCl and MgCL 2 and delayed by CaCl 2 and hypertonicity produced by sugars. Indoleacetic acid (IAA) and naphthaleneacetic acid (NAA) accelerated the separation at physiological concentrations. The rate of separation differed markedly by the age of the leaf and the species which offered the substrate material.