Notes: Cytokinin-like Activity Related to Host Reactions to Dwarf Mistletoes (Arceuthobium spp.)
Cytokinin-like substances were extracted and assayed from aerial shoots of the dwarf mistletoe Arceuthobium vaginatum subsp. cryptopodum (Engelm.) Hawksworth and Wiens, which induces witches' broom formation on infected trees. Cytokinin-like substances were also extracted from ponderosa pine tissue infected with the parasite and from healthy ponderosa pine tissue. Cytokinin-like substances were not detected in healthy ponderosa pine bark and wood tissues. Dwarf mistletoe shoots contained the most cytokinin-like activity. Similar activity was found in the infected ponderosa pine tissue but in much lower concentrations than in aerial shoots of A. vaginatum. Cytokinin-like substances were also extracted and assayed from aerial shoots of Arceuthobium occidentale Engelm., a parasite of digger pine which does not induce witches' broom formation. Cytokinin-like substances in the shoots of this dwarf mistletoe species were different from those found in Arceuthobium vaginatum. Observations of cytokinin-like activity in aerial dwarf mistletoe shoots and infected host tissue suggested that specific cytokinins may be related to witches' broom formation. Forest Sci. 29:66-70.
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Document Type: Miscellaneous
Affiliations: Professor, Department of Forest and Wood Sciences, Colorado State University, Fort Collins, CO 80523
Publication date: 1983-03-01
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