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Notes: Cytokinin-like Activity Related to Host Reactions to Dwarf Mistletoes (Arceuthobium spp.)

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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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Keywords: Arceuthobium occidentale; Arceuthobium vaginatum; Pinus ponderosa; Pinus sabiniana

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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  • Forest Science is a peer-reviewed journal publishing fundamental and applied research that explores all aspects of natural and social sciences as they apply to the function and management of the forested ecosystems of the world. Topics include silviculture, forest management, biometrics, economics, entomology & pathology, fire & fuels management, forest ecology, genetics & tree improvement, geospatial technologies, harvesting & utilization, landscape ecology, operations research, forest policy, physiology, recreation, social sciences, soils & hydrology, and wildlife management.
    Forest Science is published bimonthly in February, April, June, August, October, and December.

    2016 Impact Factor: 1.782 (Rank 17/64 in forestry)

    Average time from submission to first decision: 62.5 days*
    June 1, 2016 to Feb. 28, 2017

    Also published by SAF:
    Journal of Forestry
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