Plant Physiol.
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Plant Physiology 95:961-964 (1991)
© 1991 American Society of Plant Biologists

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Development and Growth Regulation

Xylanase and Xylosidase Activities in Avocado Fruit 1,2

Reuven Ronen, Giora Zauberman, Miriam Akerman, Asya Weksler, Ilana Rot and Yoram Fuchs

Department of Fruit and Vegetable Storage, Institute for Technology and Storage of Agricultural Products, ARO, The Volcani Center, P.O. Box 6, Bet Dagan 50250, Israel

The activities of xylanase and xylosidase were demonstrated in mature avocado (Persea americana Mill.) fruits from different cultivars. When monitored on the day of harvest during the season at 1-month intervals, xylanase activity decreased and xylosidase activity increased between January and February and then remained stable until May. When monitored during the ripening process (January harvest), xylanase activity was constant, and xylosidase activity reached a peak at the climax of ethylene evolution and cellulase activity. Xylanase, which originated from Trichoderma viride and was added to the medium in which avocado discs were incubated, induced ethylene evolution.

1 This research was supported, in part, by grant No. I-1165-86 from the United States-Israel Binational Agricultural Research and Development Fund. Contribution from the Agricultural Research Organization, The Volcani Center, Bet Dagan, Israel. No. 3020 -E, 1990 series.

2 This paper is dedicated to the memory of Jacob B. Biale, a great scientist and teacher and a dear friend.






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Copyright © 1991 by the American Society of Plant Biologists