Results 211 to 220 of about 11,998,864 (263)
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American Elm (Ulmus americana)
Methods in Molecular Biology, 2006American elm (Ulmus americana) is a valuable and sentimental tree species that was decimated by Dutch elm disease in the mid-20th century. Therefore, any methods for modifying American elm or enhancing disease resistance are significant. This protocol describes transformation and tissue culture techniques used on American elm.
Franziska Schrodt +2 more
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Elm Bark Beetle Control on American Elm, 1979, 1980
Insecticide and Acaricide Tests, 1985Abstract American elms were sprayed hydraulically with methoxychlor to determine efficacy against twig-crotch feeding by the smaller European elm bark beetle, a vector of Dutch elm disease (DED). Experiments were conducted in each of 3 cities (Denver, CO; Warren, MI; Shaker Heights, OH).
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Transgenic American elm shows reduced Dutch elm disease symptoms and normal mycorrhizal colonization
Plant Cell Reports, 2007The American elm (Ulmus americana L.) was once one of the most common urban trees in eastern North America until Dutch-elm disease (DED), caused by the fungus Ophiostoma novo-ulmi, eliminated most of the mature trees. To enhance DED resistance, Agrobacterium was used to transform American elm with a transgene encoding the synthetic antimicrobial ...
Franziska Schrodt +2 more
exaly +3 more sources
Floral Receptivity in American Elm
Canadian Journal of Forest Research, 1974The pattern of floral receptivity as measured by production of viable seeds was illustrated through controlled pollinations at five stages of anthesis. Maximum viable seed was produced from pollinations made shortly before anther dehiscence.
Ming-Jen T. Lee, Donald T. Lester
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2023
This chapter considers the American elm as excellent street trees because of their elegant form, growing tall and straight naturally, with branches that angled sharply upward. The American elm has always been a natural gathering place for people as it provides shade for countless picnics, family reunions, political discussions, and religious gatherings.
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This chapter considers the American elm as excellent street trees because of their elegant form, growing tall and straight naturally, with branches that angled sharply upward. The American elm has always been a natural gathering place for people as it provides shade for countless picnics, family reunions, political discussions, and religious gatherings.
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Nitrogenous compounds in the xylem sap of American elms with Dutch elm disease
Canadian Journal of Botany, 1969Thirty-two ninhydrin-positive nitrogenous compounds were present in the xylem sap of 6- to 9-year- old American elms. Twenty-six of these compounds were identified. Total concentration of nitrogenous materials was several times higher in diseased than in healthy sap after inoculation during the susceptible period in the spring, but was lower after ...
Dilbagh Singh, Eugene B. Smalley
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Attraction of the Native Elm Bark Beetle to American Elm After the Pruning of Branches12
Journal of Economic Entomology, 1981Hylurgopinus rufipes male and female beetles were attracted to American elms infected with Dutch elm disease, and to American elms killed by injection of cacodylic acid.H. rufipes was also attracted to solvent extracts of elm, or to Porapak Q-trapped volatiles from elm.
V. R. Landwehr +3 more
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Notes: Twins and Triplets of American Elm
Forest Science, 1974Abstract Multiple seedlings occurred at frequencies ranging from .05 to 0.4 per thousand seeds from wind-pollinated elm street trees. Unequal vigor was common between siblings and less vigorous seedlings usually died after initial expansion of the first true-leaf pair. All multiple seedlings were tetraploid. Forest Sci. 20:142.
D. T. Lester, M. J. T. Lee
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Response of Smaller European Elm Bark Beetles to Pruning Wounds on American Elm
Arboriculture & Urban Forestry, 1987AbstractFrom 1982 to 1984, inflight smaller European elm bark beetles,Scolytus multistriatus, were captured on American elms,Ulmus americana, that were therapeutically pruned for Dutch elm disease control. Pruning wounds were treated with wound dressing or left untreated to determine effects of the treatments on beetle attraction.
Jack H. Barger, William N. Cannon
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Protoplast-to-plant regeneration of American elm (Ulmus americana)
Protoplasma, 2014This study describes a protocol for regeneration of plants from cell suspension-derived protoplasts of American elm (Ulmus americana). Efficient protoplast isolation was achieved from a two-phase culture system through the incorporation of 100 μM 2-aminoindan-2-phosphonic acid, with a yield of approximately 2 × 10(6) protoplasts/ml packed cell volume ...
A M P, Jones +3 more
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