Necrophylactic periderm

Table I. Histochemical responses of cell walls associated with the necrophylactic periderm response in Picea sitchensis challenged with Armillaria obscura...

Figure 1. Structural responses of the bark of Picea sitchensis to wounding and inoculation with Phaeolus schweinUzii. IW, inoculated wound SP, surface periderm NT, necrotic tissue TC, thickened cells SIT, relic of suberized impervious tissue NP, necrophylactic periderm P, phloem VC, vascular cambium.

Figure 3. Hyphae (arrowed) of Armillaria obscura in thick walled cells (TC) overlying the necrophylactic periderm (NP) in Picea siichensis. Bark sectioned and stained with toluidine blue as previously described (15). Scale bar = 25 /im.

Figure 4. Penetration of necrophylactic periderms (NP) in the root of Ar-moracia rusiicana by rhizomorph-like aggregations of hyphae (R). Scale bar = 100 pm.

Biggs A R, Stobbs L W 1986 Fine structure of the suberized cell walls in the boundary zone and necrophylactic periderm in wounded peach bark. Can J Bot 64 1606-1610... 

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