| the discovery of three genetic races of the dwarf mistletoe arceuthobium americanum (viscaceae) provides insight into the evolution of parasitic angiosperms. | a population genetic approach was used to explore the evolutionary biology of the parasitic angiosperm arceuthobium americanum nutt. ex engelm. (viscaceae). arceuthobium americanum infects three principal hosts and has the most extensive geographical range of any north american dwarf mistletoe. based on the lack of apparent morphological and phenological differences between populations of a. americanum, past researchers have found no evidence for recognizing infraspecific taxa. in this study, mo ... | 2002 | 11918778 |
| comparative population structure and genetic diversity of arceuthobium americanum (viscaceae) and its pinus host species: insight into host-parasite evolution in parasitic angiosperms. | in a recent study we revealed that the parasitic angiosperm arceuthobium americanum is comprised of three distinct genetic races, each associated with a different host in regions of allopatry. in order to assess the role of host identity and geographical isolation on race formation in a. americanum, we compared the genetic population structure of this parasite with that of its three principal hosts, pinus banksiana, pinus contorta var. latifolia and pinus contorta var. murrayana. despite the fac ... | 2002 | 11928707 |
| antibodies raised against tobacco aquaporins of the pip2 class label viscin tissue of the explosive dwarf mistletoe fruit. | dwarf mistletoes, genus arceuthobium, are parasitic flowering plants and forest pests. in western north america, arceuthobium americanum (lodgepole pine dwarf mistletoe) is principally found on pinus contorta var. latifolia (lodgepole pine). dwarf mistletoes disperse their seeds by an explosive process that involves the buildup of hydrostatic pressure within a mucilaginous fruit tissue called the 'viscin'. living viscin tissue envelops the discharged seeds. this study examined the possibility th ... | 2010 | 20653906 |
| direction of interaction between mountain pine beetle (dendroctonus ponderosae) and resource-sharing wood-boring beetles depends on plant parasite infection. | plant pathogens can have cascading consequences on insect herbivores, though whether they alter competition among resource-sharing insect herbivores is unknown. we experimentally tested whether the infection of a plant pathogen, the parasitic plant dwarf mistletoe (arceuthobium americanum), on jack pine (pinus banksiana) altered the competitive interactions among two groups of beetles sharing the same resources: wood-boring beetles (coleoptera: cerambycidae) and the invasive mountain pine beetle ... | 2016 | 26820567 |
| thermogenesis-triggered seed dispersal in dwarf mistletoe. | lodgepole pine dwarf mistletoe (dm), arceuthobium americanum, is a parasitic flowering plant and forest pathogen in north america. seed dispersal in dm occurs by explosive discharge. notably, slight warming of ripe dm fruit in the laboratory can trigger explosions. previously, we showed that alternative oxidase, a protein involved in endogenous heat production (thermogenesis) in plants, is present in dm fruit. these observations have led us to investigate if thermogenesis induces discharge. here ... | 2015 | 25662062 |
| effects of dwarf mistletoe on stand structure of lodgepole pine forests 21-28 years post-mountain pine beetle epidemic in central oregon. | lodgepole pine (pinus contorta) forests are widely distributed throughout north america and are subject to mountain pine beetle (dendroctonus ponderosae) epidemics, which have caused mortality over millions of hectares of mature trees in recent decades. mountain pine beetle is known to influence stand structure, and has the ability to impact many forest processes. dwarf mistletoe (arceuthobium americanum) also influences stand structure and occurs frequently in post-mountain pine beetle epidemic ... | 2014 | 25221963 |
| fungal endophytes of the obligate parasitic dwarf mistletoe arceuthobium americanum (santalaceae) act antagonistically in vitro against the native fungal pathogen cladosporium (davidiellaceae) of their host. | | 2012 | 23196398 |
| an antibody against a conserved c-terminal consensus motif from plant alternative oxidase (aox) isoforms 1 and 2 label plastids in the explosive dwarf mistletoe (arceuthobium americanum, santalaceae) fruit exocarp. | dwarf mistletoes, genus arceuthobium (santalaceae), are parasitic angiosperms that spread their seeds by an explosive process. as gentle heating triggers discharge in the lab, we wondered if thermogenesis (endogenous heat production) is associated with dispersal. thermogenesis occurs in many plants and is enabled by mitochondrial alternative oxidase (aox) activity. the purpose of this study was to probe arceuthobium americanum fruit (including seed tissues) collected over a 10-week period with a ... | 2013 | 22562749 |
| a new way of describing meiosis that uses fractal dimension to predict metaphase i. | meiosis, the reductive nuclear division, is a continuum, but for purposes of communication, is described in stages. in sexually-reproducing organisms, including the dwarf mistletoe arceuthobium americanum, prophase i of meiosis is prolonged (8 months for female a. americanum). conversely, metaphase i, where chromosome pairs line up along a dividing cell's "equator", is relatively brief, difficult to predict, but critical regarding the random distribution of the paternal and maternal chromosomes ... | 2005 | 16094465 |