By W. Merrill (auth.), Professor Dr. Robert A. Blanchette, Professor Dr. Alan R. Biggs (eds.)
For the previous decade, it's been obvious to either one of us reference textual content protecting all points of tree safety mechanisms to fungi was once lacking, wanted and lengthy past due. the sort of e-book would offer a transparent, finished evaluation of the way residing roots, stems and leaves reply to fungal pathogens. the necessity for this sort of publication grew to become in creasingly transparent to us from our conversations with one another, in addition to from our interactions with scholars and co-workers who wanted a sourcebook containing experiences of morphological, biochemical and physiological elements of host-parasite interactions in timber. in the course of a box journey subsidized through the wooded area Pathology Committee of the Ameri can Phytopathological Society, on a bus from one website to a different, we made up our minds to take the accountability to organize a publication of this kind and started to plot its composition. To accurately deal with the subject of this e-book as we had predicted it, we believed that well-illustrated chapters have been wanted which will replicate the $64000 advances made via the numerous investigators who've tested the anatomical and physiological adjustments that take place whilst timber are attacked through fungi. we're thankful to Dr. Tore Timell, the wooden technological know-how editor for Springer-Verlag, for helping our efforts and for offering an street to submit the sort of profusely il lustrated volume.
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Additional info for Defense Mechanisms of Woody Plants Against Fungi
The separation of events according to spacial and temporal criteria is artificial given the intimate contact and free exchange of materials among compartments. What emerges following an injury is a series of predictable and coordinated events which concludes, in the bark of woody plants, with formation of a primary ligna-suberized boundary layer, cell division leading to the formation of wound periderm, the production of callus tissue, new vascular cambium, and eventual closure of the wound. Stimulation of the shikimic acid pathway leading to enhanced production of phenolic derivatives is a ubiquitous response among plants when injured or infected (Vance eta!.
The suberin portion of the cell walls appeared, at first, electron-lucid, followed by the formation of many light and dark lamelations. The suberin lining in individual cells appeared to be uniform in thickness, although thickness of the lining varied from cell to cell (ca. 40-120nm). Suberized cells in the boundary zone contained senescing cytoplasm with fragments of undifferentiated Fig. 5. Transverse sections of peach bark examined with ultraviolet epifluorescence illumination (13-17, bar = 10 pm) and transmission electron microscopy (18-20, bar = I 11m).
In linden, callus tissue forms from any active, newly formed cambial derivative rather than from any one particular cell type (Barker 1954). Generally, there is a diversity of opinion on the source of callus in the regeneration of new bark (Bloch 1941), although most researchers agree that the original vascular cambium does not contribute significantly to the formation of callus tissue. The initiation of phellogen regeneration in callus always precedes that of vascular cambium. The ventral region of growing callus, where the differentiating phellogen and vascular cambium are in close proximity, is nonlignified and nonsuberized and is especially susceptible to disruption by pathogenic fungi (Biggs 1986a, Biggs and Britton 1988).