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Morphological and Anatomical Changes in Vegetative Organs and Tissues of Coniferous Species at Insect Gall Formation. Pp. 102–112.

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Section: Biology




Surso Mikhail Voldemarovich, Institute of Ecological Problems of the North, Ural Branch of the Russian Academy of Sciences (Arkhangelsk, Russia)


The paper presents the results of the morphological and anatomical study of Juniperus communis galls caused by two-whorled juniper gallfly (Oligotrophus panteli Kieffer, Diptera: Cecidomyiidae) and of Picea ajanensis adelgid galls caused by Adelges laricis Vallot (Homoptera: Adelgidae). Formation of two-whorled juniper gallfly galls is caused by malfunction of shoot apical meristem and by abnormal growth of needles of two top whorles. The most considerable changes in the anatomical structure are observed in the needles of the internal whorl of the gall. The structure of A. laricis galls is characterized by abnormal growth of the basal part of the needles, absence of endoderm, lack of cell walls rugosity of needle mesophyll, as well as dysfunction of the resin ducts. The most significant changes are observed in the basal part of the gall-forming needles.


gall, juniper, Oligotrophus panteli, spruce, Adelges laricis, needles, tissue.

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