Lubia M. Guedes, Elvis Gavilán, Claudia Pérez, José Becerra, Narciso Aguilera
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Key message
Dasineura sp. galls develop in the vascular system of Peumusboldus stems, inhibiting phloem and fiber formation and alkaloid and fatty acid synthesis, and fostering compound synthesis towards alkanes.
Abstract
Peumusboldus is a native Chilean tree with recognized biological activity, mainly medicinal, insecticidal, and herbicidal, whose stems house the galling insect Dasineura sp. Galling insects have the ability to manipulate host tissues for food and shelter. With this in mind, it would be expected that the phytophagous action of Dasineura sp. could impact the structural and chemical composition of P.boldus stems. To prove this hypothesis, a comparative study of P.boldus stem and gall anatomy and chemical composition was performed. The galling Dasineura sp. induces structural alterations in the vascular cylinder of P.boldus stems, where it establishes itself. The differentiation of phloem tissue and perivascular fibers is also inhibited, forming homogeneous parenchymal tissue in the outer gall tissue. The vascular cambium assumes new functions, forming two new cell types, the parenchymatic and the nutritive cells around the larval chamber on which the larvae feed. Dasineura sp. also induces alterations in P.boldus stem chemical composition, redirecting compound synthesis towards alkane production and inhibiting the synthesis of one alkaloid and fatty acid, two sesquiterpenes, and three sterols in the non-galled stems. The redistribution of the accumulation sites of proteins, lipids, and reducing sugars towards the gall nutritive cells, guarantee the Dasineura sp. nutrition.
期刊介绍：
Trees - Structure and Function publishes original articles on the physiology, biochemistry, functional anatomy, structure and ecology of trees and other woody plants. Also presented are articles concerned with pathology and technological problems, when they contribute to the basic understanding of structure and function of trees. In addition to original articles and short communications, the journal publishes reviews on selected topics concerning the structure and function of trees.
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