S ummary Stem stele tissues of Verticillium wilt‐resistant (Seabrook Sea Island 12B2) cotton plants were examined for location of the pathogen and localization of terpenoid aldehyde accumulation 5 days after inoculation with Verticiliium dahliae. Mycelia of V. dahliae were confined to the vessel lumina. Terpenoid aldehyde phytoalexins were detected histochemically in fresh sections as red Sb‐chelates after application of the terpenoid aldehyde‐specific SbCl 3 reagent. Most terpenoid aldehydes were detected as diffuse deposits in and around colonized xylem vessels; however, some were localized in solitary xylem parenchyma cells appressed to vessel walls or in solitary xylem and pith parenchyma cells removed from any V. dahliae‐colonized vessels. Thus, physical contact with the pathogen is not required for elicitation of terpenoid aldehyde accumulation.
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M. E. Mace (1983) studied this question.
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