Quaking aspen

ASH, white (Fraxinus americana L.) ASPEN, quaking (Populus tremuloides Michz.)... 

Frescholtz T. 2002. Assessing the role of vegetation as sources and sinks of atmospheric Hg using quaking aspen. MS thesis. University of Nevada Reno, 67 p. 

U MI, Wexford Co. sandy soil, quaking aspen-bracken fern. 8 25 25 13 0 38 25... 

Quaking aspen Populus tremuloides Scales of flower buds Ruffed grouse Bonasa sp. Coniferyl benzoate Jakubas etal., 1989... 

Female flowers of dioecious trees are better defended than males. RuflFed grouse, Bonasa umbellus, prefer male flowers of quaking aspen, Populus tremuloides, in winter, and leaves of male specimens in summer (Svoboda and Gullion 1972). Ruffed grouse also feed more on male trees of balsam poplar (Bryant etal, 1991). 

FIGURE 11.24 Leaching (a) Standard pieces of different trees leach out different amounts of phenolics and other compounds. During 24 hours, red maple and witch hazel (left) stain water a darker brown than willow and quaking aspen (right), (b) and (c) Beavers leave pieces of branches in the water for 1-3 days with some or all bark intact before eating the bark. This presumably leaches out water-soluble plant secondary compounds. 

Jakubas, W. J. and Gullion, G. W. (1990). Coniferyl benzoate in quaking aspen a ruffed grouse feeding deterrent. Journal of Chemical Ecology 16,1077-1087. 

Table I. Secondary Compounds Identified In Leaves and Bark of Quaking Aspen (Populus tremuloldes Mlchx)...

In addition to the unique and quite dramatic differences in feeding/survival of larvae of the P. glaucus complex and their hybrids (2 0) (Table III), tulip tree and quaking aspen represent phytochemically intriguing foodplants for several other North... 

Harding, S.A. et al.. Differential substrate inhibition couples kinetically distinct 4-coumarate coenzyme A ligases with spatially distinct metabolic roles in quaking aspen. Plant Physiol, 128, 428, 2002. 

Prasad, R. and J.C. Feng (1990). Spotgun-applied hexazinone Release of red pine (Pinus resinosa) from quaking aspen (Populus tremuloides) competition and residue persistence in soil. Weed Technol., 4 371-375. 

Rier, S. T., Tuchman, N. C., Wetzel, R. G. Teeri, J. A. (2002). Elevated-C02-induced changes in the chemistry of quaking aspen (Populus tremuloides Michaux) leaf litter subsequent mass loss and microbial response in a stream ecosystem. Journal of the North American Benthological Society, 21, 16-27. 

Fig. 8.1 Feeding preferences by free-ranging beavers Castor canadensis) for 3 species of northeastern deciduous trees and shrubs American beech (Fagus grandifolia), quaking aspen Populus tremuloides), striped maple (Acer pensylvanicum), witch hazel (Hamamelis virginiana), witch hobble (Viburnum lantanoides) and yellow birch (Betula alleghaniensis). The experiment was run over 10 days. Each morning the number of remaining sticks was counted. Only one of 10 beech sticks was taken after 10 days, while, at the other extreme, no sticks of aspen and striped maple remained after 4 and 5 days, respectively...

Fig. 8.3 A mixed feeding experiment with free-ranging beavers, including six species of deciduous trees and shrubs, and two growth forms (adult and juvenile) of quaking aspen. The experiment was run for 5 days. Note the two extremes witch hazel vs. adult form of aspen...

Jakubas WL, Gullion, GW, Clausen TP (1989) Ruffed grouse feeding behavior and its relationship to secondary metabolites of quaking aspen flower buds. J Chem Ecol 15 1899-1918... 

Figure 31. Cross-sectional sutFace of a young quaking aspen stem. Note the white arcs tension wood(TW) (NW = normal wood). (Reproduced from Ref. 39. Copyright 1982, American Chemical Society.)...

Figure 33. Cross-sectional views of tension wood in a young quaking aspen stem. (Reproduced from Ref. 39. Copyright 1982, American Chemical Society.) (A) Light micrograph of a section that was selectively stained to differentiate the gelatinous layers in G-ftbers. (B) SEM of a surface of tension wood fiber zone. The Gravers, which are loosely attached to the rest of the fiber wall, were dislodged during specimen preparation and...

The quaking aspen tree (Populus tremuloides) is a common tree in North America that is used for its timber. The wood-rotting pathogen Phellinus tre-mulae causes significant economic losses of this tree. Although the sesqui-terpenoid metabolites such as tremulenolide A (5.89) have a carbon skeleton that is isomeric with the lactaranes, some doubts have been expressed on its biosynthetic origin from farnesyl diphosphate. 

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