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Abstract
The involvement of cellulase (endo-b-l,4-glucanase, EC 3.2.1.4) in a number of different cell separation events which occur in higher plants has been well established. Besides their significance for the plant growth and differentiation, these events can be economically important since they also comprise softening of fleshy fruits and abscission of fruits, flowers and leaves. In higher plants cellulase is present in a number of different biochemical isoforms which are encoded by different genes. This finding is in accordance with the wide range of physiological events which require the intervention of cellulase activity, and whose peculiarities and amplitudes can be quite various.