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  • Canadian Science Publishing  (3)
  • American Association for the Advancement of Science (AAAS)
  • Springer
  • 1995-1999  (1)
  • 1985-1989  (2)
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Year
  • 1
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    Unknown
    Influence of humidity and temperature during exposure on SO2-induced leaf necrosis of Virginia pine and river birch (1987)
    Canadian Science Publishing
    Details
    Publication Date: 1987-10-01
    Description: River birch and Virginia pine seedlings were exposed to 0.8 or 1.0 ppm SO2 (approximately 2100 and 2600 μg m−3, respectively) for 4 h at temperatures of 16, 24, and 32 °C and at relative humidities of 60, 75, and 90%, in all combinations. Virginia pine seedlings exhibited increased SO2-induced leaf necrosis with increasing temperature and with increasing humidity. For greenhouse-grown Virginia pine seedlings, the relationship between leaf necrosis and vapor pressure deficit was linear with a common negative slope but with different intercepts for each temperature. For Virginia pine seedlings grown outdoors, the relationship between leaf necrosis and vapor pressure deficit was also linear, but both slope and intercept changed with temperature. For river birch, temperature did not greatly affect the overall level of injury; instead, the response to humidity was negligible, linear, or quadratic, depending on temperature and on the conditions under which seedlings were grown. The effects of temperature and humidity on injury to Virginia pine are consistent with an explanation based on changes in leaf conductance; however, such an explanation cannot easily account for the observed response of river birch.
    Print ISSN: 0045-5067
    Electronic ISSN: 1208-6037
    Topics: Agriculture, Forestry, Horticulture, Fishery, Domestic Science, Nutrition
    Published by Canadian Science Publishing
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  • 2
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    Identification of Armillaria species isolated from bigtooth aspen based on rDNA RFLP analysis (1998)
    Canadian Science Publishing
    Details
    Publication Date: 1998-01-01
    Description: Restriction fragment length polymorphism analysis (RFLP) of the intergenic region (IGR-1) between the 3 ' end of the 26S ribosomal RNA gene and the 5 ' end of the 5S rRNA gene was used to identify 39 isolates of Armillaria species collected from live or recently dead bigtooth aspen (Populus grandidentata Michx.) trees and sucker sprouts in the Tioga State Forest, Pennsylvania. The unknown isolates were identified by comparing their restriction fragment patterns with 18 isolates of known Armillaria species common to the northeastern United States. Twenty of the unknown isolates (50%) were identified as either Armillaria gallica or Armillaria calvescens. Eighteen (46%) of the isolates were identified as Armillaria ostoyae. One isolate of Armillaria sinapina was obtained from a recently dead aspen tree. One isolate of Armillaria mellea, considered to be the most divergent of the Armillaria species, was obtained from basidiomes fruiting on a recently dead aspen tree near Berwick, Pennsylvania. In some instances, amplification of DNA was possible by adding mycelial scrapes directly to the polymerase chain reaction (PCR) mix, thus precluding the need for DNA extraction. Advancements in RFLP analysis may offer a method able to provide rapid and precise identification of most North American and European Armillaria isolates.
    Print ISSN: 0045-5067
    Electronic ISSN: 1208-6037
    Topics: Agriculture, Forestry, Horticulture, Fishery, Domestic Science, Nutrition
    Published by Canadian Science Publishing
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  • 3
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    Major and trace element concentrations in surface organic layers, mineral soil, and white oak xylem downwind from a coal-fired power plant (1989)
    Canadian Science Publishing
    Details
    Publication Date: 1989-12-01
    Description: White oak (Quercusalba L.) xylem tissues, associated mineral soils (0 to 25 cm), and surface organic layers (O2 horizon) were sampled downwind from a 623 MW coal-fired power plant to determine whether major or trace element concentration patterns were affected by changes in emission stack heights during a 32-year operating period. Four sites with Hazleton (Typic Dystrochrept) soils located at 0.25, 1.2, 2.0, and 10.3 km downwind from the power plant were sampled. In surface O2 layers, Fe and Co concentrations varied inversely with distance from the power plant. Inductively coupled plasma–atomic emission spectroscopy was used to determine concentrations (ppm) of P, K, Ca, Mg, Fe, Mn, B, Na, Sr, Ba, Cu, Al, Si, Cr, Ni, Co, Pb, and Cd in xylem tissues during four separate time periods: one preoperation and three periods concurrent with power plant operation. Only Sr concentrations showed a consistent pattern of greatest accumulation in the xylem during periods when emission stacks were lowest, and at sites closest to the power plant. Potentially toxic elements were not detected at elevated levels in xylem tissues; however, xylem Sr may be a sensitive bioindicator of historical fly-ash deposition.
    Print ISSN: 0045-5067
    Electronic ISSN: 1208-6037
    Topics: Agriculture, Forestry, Horticulture, Fishery, Domestic Science, Nutrition
    Published by Canadian Science Publishing
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