Cytochemical and Tissue Homogenate Analysis of Adenosine Triphosphatase in Root Tips of Texas "Lost Pines"
Abstract:Cytochemical procedures have located certain cation-ATPases in the nuclei of meristematic root tip cells from "Lost Pines," a race of loblolly pine (Pinus taeda L.) found growing under droughty conditions in Texas 100 or so miles west of the species' main range. Greatest ATPase activity occurred when calcium and potassium were combined in the substrate. Magnesium produced far less ATPase activity, and sodium appeared to inhibit the system. Analysis of inorganic phosphate liberated from individual components of the root tip cells supported the cytochemical evidence, both as to site of ATPase activity and to relative degree of activation. The potassium-calcium ATPase system found in Lost Pines differs completely from that found in root tips of other loblolly pines, in which sodium with magnesium appears to be the most effective ATPase activator. These biochemical contrasts suggest that Lost Pines differ genetically from other loblolly pines. Forest Sci. 17:446-451.
Document Type: Journal Article
Affiliations: Former Graduate Student, Dep. of Biology, University of Mississippi, Now, University of Southern Mississippi
Publication date: 1971-12-01
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