A comprehensive review of work pertinent to changes in the separation zone prior to abscission is presented. Since these changes are largely pectic in nature the involvement of pectic enzymes is suggested. The results obtained for the role of pectin methylesterase (PME) in abscission are as follows: (1) A localization of PME activity in the abscission zone of tobacco pedicels was established; (2) Pollination of tobacco flowers is followed by an increase in PME activity in the abscission zone while PME activity remains static after prevention of pollination (the flower abscises within a week if not pollinated); (3) Application of indole acetic acid to unfertilized tobacco ovaries stimulated an increase in PME activity of the abscission zone of the pedicel.
Proceedings of the Iowa Academy of Science
©1969 Iowa Academy of Science, Inc.
Smith, Daryl D.
"Relationship of Pectic Enzymes to Abscission,"
Proceedings of the Iowa Academy of Science, 76(1), 45-61.
Available at: https://scholarworks.uni.edu/pias/vol76/iss1/8