The development of the leaf abscission zone in Ginkgo biloba trees and seedlings was studied. Leaves from Ginkgo seedlings were debladed to enhance anatomical changes in the abscission region. The development of an abscission layer was observed six days after deblading. The formation of the zone was not complete, but an abaxial to adaxial pattern of development was apparent. No evidence of separation was noted. Debladed Ginkgo petioles remained green and did not abscise during the six weeks period of study. The development of an abscission layer was observed in leaves from a Ginkgo tree one week prior to separation. The zone occupied an area approximately eleven cells wide at the junction of the petiole and stem. Separation of the petiole occurred through an apparent dissolution of the middle lamella. The separation was observed in the distal region of the zone between the ninth and tenth cell layers. The pattern of leaf abscission zone development is similar in Ginkgo trees and seedlings.
Proceedings of the Iowa Academy of Science
©1970 Iowa Academy of Science, Inc.
Mosher, G. Wayne and Smith, Daryl D.
"A Study of Abcission Zone Development In Leaves of Ginkgo Biloba L.,"
Proceedings of the Iowa Academy of Science, 77(1), 23-31.
Available at: https://scholarworks.uni.edu/pias/vol77/iss1/7