By George A. Petrides
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Extra info for A Field Guide to Western Trees: Western United States and Canada
Deltoides. Further south and west, along the Bow and Oldman tributaries of the South Saskatchewan River, a western species, P. balsamifera subsp. trichocarpa, and the southern species P. angustifolia (a relative of P. balsamifera) are also represented, and hybrid combinations of them are found. Highly diversified populations have been generated, but since stabilization of habitats does not occur and isolation is non-existent, the author did not expect that new species would emerge. However, a wider range of poplar varieties than is currently used may be available for further selection (Brayshaw 1965).
In tropical regions most species seem to be outcrossing, but mixed mating has been reported for some species by describing them as self-compatible (Burley et al. 1986). 02, or 2%, and very little genetic variability, but it can be easily crossed with many other species in the same genus (Matheson 1990). Whether it is a true inbreeding species comparable to agricultural plants is not known. Outcrossing is typical for most forest trees studied so far. Deleterious recessive genes are present. Selfing reduces seed set and causes loss of vigour and mortality.
3. Pinus resinosa is widely distributed in eastern North America in temperate and adjacent boreal regions. Characteristics common to many other conifers include wind pollination and sexual reproduction in a monoecious, diploid species. Characteristics that are unique include its ability to produce viable seed after selfing, remarkable morphological uniformity, and little isoenzyme variation. Inbreeding depression was discovered only after several years of field testing (Hoist and Fowler 1975; Fowler and Morris 1977; Mosseler et al.