@article {Schaffer:1983:0015-749X:66,
	author = "Schaffer, Bruce and Hawksworth, Frank G. and Wullschleger, Stan D. and Patrick Reid, C. P.",
	title = "Notes: Cytokinin-like Activity Related to Host Reactions to Dwarf Mistletoes (Arceuthobium spp.)",
	journal = "Forest Science",
	volume = "29",
	number = "1",
	year = "1983",
	abstract = "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.",
	pages = "66-70",
	url = "http://www.ingentaconnect.com/content/saf/fs/1983/00000029/00000001/art00012",
	keyword = "Pinus ponderosa, Pinus sabiniana, Arceuthobium vaginatum, Arceuthobium occidentale"
}