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Plant Physiology 61:416-419 (1978)
© 1978 American Society of Plant Biologists

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Cellulase Activity and Fruit Softening in Avocado 1

Edna Pesis, Yoram Fuchs and Giora Zauberman

Division of Fruit and Vegetable Storage, Institute for Technology and Storage of Agricultural Products, Agricultural Research Organization, The Volcani Center, P.O. Box 6, Bet Dagan, Israel

Cellulase activity in detached avocado (Persea americana Mill.) fruits was found to be directly correlated with ripening processes such as climacteric rise of respiration, ethylene evolutin, and softening. This activity in the pericarp could be induced by ethylene treatment, and the more mature the fruit—the faster and the greater was the response. Only a very low cellulase activity could be detected in hard avocado fruit right after harvest. Cellulase activity was highest at the distal end of the fruit, lower in the midsection, and lowest at the proximal end. The enzyme is heat-labile and appeared to have activity of an endocellulase nature mainly. Electron micrographs of cell walls from hard and soft fruits are presented.

1 Contribution from the Agricultural Research Organization, The Volcani Center, Bet Dagan, Israel. 1977 Series, No. 152-E.




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