Monoterpene concentrations in fresh,senescent, and decaying foliage of singleleaf pinyon (Pinus monophylla Torr. & Frem.: Pinaceae) from the western Great Basin |
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Authors: | F Martin Wilt Glenn C Miller Richard L Everett Murray Hackett |
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Affiliation: | (1) Department of Range, Wildlife, and Forestry, University of Nevada at Reno, 89512 Reno, Nevada;(2) Forestry Sciences Laboratory, USFS, 1133 North Western Avenue, 98801 Wenatchee, Washington;(3) Department of Biochemistry, University of Nevada at Reno, 89557 Reno, Nevada |
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Abstract: | Senescent foliage from pines is potentially a large contributor to the total monoterpene content of the litter layer, and the availability of these compounds as phytotoxins may result from release of these compounds into the vapor phase. In order to determine the fate of several monoterpene hydrocarbons in the natural environment, we examined their concentrations in fresh, senescent, and decaying needles from 32 single-leaf pinyon pine (Pinus monophylla Torr. & Frem.: Pinaceae) trees growing at two different locations. Total monoterpene content was highest in the fresh needles (mean=5.6 ± 2.2 mg/g extracted air dry weight), but also remained relatively high in senescent needles (mean=3.6 ±1.8 mg/g extracted air dry weight), either still attached to the tree or forming the freshest layer of understory litter. Decaying needles within a dark decomposing layer of litter material 5–20 cm from the surface were found to contain much lower amounts of total monoterpenes (average: =0.12 ±0.06 mg/g extracted air dry weight). Further investigation of the fate of these compounds in the pinyon understory is required to determine if these hydrocarbons are indeed exerting phytotoxic characteristics. |
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Keywords: | Pinus monophylla single-leaf pinyon pine allelopathy monoterpene senescent tree litter decaying vapor phase volatile hydrocarbons phytotoxin |
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