Graduate Thesis Or Dissertation
 

Effects of cork bark disease on cambial activity and secondary tissues in Abies lasiocarpa (Hook.) Nutt

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https://ir.library.oregonstate.edu/concern/graduate_thesis_or_dissertations/r781wk163

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  • Abies lasiocarpa (Hook.) Nutt. (sub-alpine fir) trees of comparable vigor growing in eastern British Columbia were studied in order to determine the effects of cork bark disease on phellogen and vascular cambium activity. Diseased trees form hard deeply fissured rhytidome several inches thick over large areas of the bole when phellogens that produce large increments of phellem form successively deeper in cortical and secondary phloem tissues. Expansion of the secondary xylem cylinder causes cracks to form in the rhytidome. Non-infested trees and areas above and below infested sites may retain their superficial phellogen for nearly 200 years and possess relatively thin layers of cork with a smooth surface texture. Phellem cells from diseased areas contain numerous fungal hyphae. Those from adjacent smooth bark areas and healthy trees are filled with phenolic compounds but are of different dimensions and lack hyphae. In addition infested areas show denser wood, significantly shorter tracheids, sieve cells and fusiform initials, greater frequency of fusiform initials dividing by anticlinical partitions, higher rate of new fusiform initial loss, and greater number of vertical albuminous cells. New ray initials are formed from declining fusiform initials in control and diseased trees.
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