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Articles 1 - 30 of 51
Full-Text Articles in Life Sciences
Freshwater Silica-Scaled Heterotrophic Protista: Heliozoa, Thaumatomonad Flagellates, Amoebae, And Bicosoecids, From The Lake Itasca Region, Minnesota, Daniel E. Wujek
Freshwater Silica-Scaled Heterotrophic Protista: Heliozoa, Thaumatomonad Flagellates, Amoebae, And Bicosoecids, From The Lake Itasca Region, Minnesota, Daniel E. Wujek
Journal of the Minnesota Academy of Science
Forty-nine plankton samples were collected from the Lake Itasca Region, Minnesota over a period sporadically covering the summers of 1980, 1981 and 1987. A total of 22 freshwater heterotrophic siliceous-scaled species were observed: 18 heliozoa, two thaumatomonad flagellates, one bicosoecid, and one testate amoeba. Scale identifications were based on transmission electron microscopy. New records for North America include two heliozoans and one thaumatomonad flagellate. Five heliozoa taxa and one thaumatomonad flagellate are new records for the U.S. Wujek DE. Freshwater silica-scaled heterotrophic protista: heliozoa, thaumatomonad flagellates, amoebae, and bicosoecids, from the Lake Itasca Region, Minnesota.
Screening Pinus Sylvestris Grown For The Production Of Christmas Trees For Resistance To Western Gall Rust Peridermium Harknessii Using Different Sources Of Aeciospores, Todd A. Burnes, Jennifer Juzwik, Robert A. Blanchette
Screening Pinus Sylvestris Grown For The Production Of Christmas Trees For Resistance To Western Gall Rust Peridermium Harknessii Using Different Sources Of Aeciospores, Todd A. Burnes, Jennifer Juzwik, Robert A. Blanchette
Journal of the Minnesota Academy of Science
Results showed a moderate to high susceptibility of Pinus sylvestris to western gall rust Peridermium harknessii from Pinus sylvestris in Michigan and Pinus banksiana in Minnesota. In general, Pinus sylvestris seed sources were more susceptible to aeciospores collected from Pinus sylvestris than aeciospores collected from Pinus banksiana.
Between A Rock And A Hard Place: Opuntia Fragilis (Nutt.) Haw. (Cactaceae) In Stearns County, Minnesota, Eric Ribbens, Jeremy Myrom
Between A Rock And A Hard Place: Opuntia Fragilis (Nutt.) Haw. (Cactaceae) In Stearns County, Minnesota, Eric Ribbens, Jeremy Myrom
Journal of the Minnesota Academy of Science
We surveyed the distribution of Opuntia fragilis ( Nutt.) Haw. in Steam County, MN, where it is restricted to a few rock outcrops. To compare the populations within three sites, we mapped clusters of pads and measured each individual pad within each cluster. Pads tended to be located in a narrow band of shallow soil between the bare rock and the angiosperm-dominated plant communities growing on adjacent deeper soils. Significant differences existed between the three populations in pad widths, average pad cluster sizes, and pad appearances. Although several pads flowered, none of the flower set seed, indicating that persistence of …
Peltandra Virginica (L.) Schott & Endl. (Arrow Arum), A New Species And Genus For Minnesota, Charles Argue
Peltandra Virginica (L.) Schott & Endl. (Arrow Arum), A New Species And Genus For Minnesota, Charles Argue
Journal of the Minnesota Academy of Science
Peltandra virginica is reported as a new addition to the flora of Minnesota. Found in Cook County in the northeasternmost part of the state, it is separated by about 400 km from the closest previously reported location for this species on Michigan's upper peninsula.
Additions And Corrections To The Rust Fungus Flora Of Minnesota, John W. Mccain
Additions And Corrections To The Rust Fungus Flora Of Minnesota, John W. Mccain
Journal of the Minnesota Academy of Science
Ten taxa of rust fungi (Coleosporium campanulae, Puccinia amphigena, P. caulicola, P.longipes var. brevipes, P. mcclatchieana, P. magnusiana, P.punctata var. troglodytes, Tranzschelia arthurii, Uromyces dictyosperma, and U. plumbarius) are reported for the first time from Minnesota. Seven other rust species (Puccinia adoxae, P. distichlidis, P. interoeniens, P. pygmaea, P. typhae, Uromyces andropogonis, and U. geranit) should be removed from the state flora list. Puccinia typhaealso is excluded from the U.S. rust flora list. New Minnesota host plants are reported for fifteen rust pathogens. One host species is deleted for P. polygoniamphibii. Intrastate 200-mile range extensions are reported for four rust …
The Synoptic Key: Cercospora And Allied Genera, Elwin L. Stewart, F. L. Phleger
The Synoptic Key: Cercospora And Allied Genera, Elwin L. Stewart, F. L. Phleger
Journal of the Minnesota Academy of Science
The advantages and disadvantages of the synoptic key are discussed and a synoptic key to Cercospora and 15 allied genera is presented.
Pollen Morphology Of The New Species Mimulus Shevockii And A Possibly Related Species, M. Barbatus (Scrophulariaceae), Charles L. Argue
Pollen Morphology Of The New Species Mimulus Shevockii And A Possibly Related Species, M. Barbatus (Scrophulariaceae), Charles L. Argue
Journal of the Minnesota Academy of Science
The pollen grains of Mimulus shevockii and M barbatus have three long, equally spaced, meridionally oriented apertures with transversely ruptured membranes, and the pollen walls are microreticulate with smooth muri. The pollen evidence (pollen size and shape, rupturing pattern and ornamentation of the aperture membrane, size and spacing of lumina, and ornamentation of muri) is applied to comparisons between the pollen of M shevockii and that of other species in section Paradanthus. These data are consistent with a proposed relationship between M shevockii and M barbatus of the M rubellus/M palmeri group.
A Survey Of The Vascular Plants Of Norway Dunes, Janet Boe
A Survey Of The Vascular Plants Of Norway Dunes, Janet Boe
Journal of the Minnesota Academy of Science
Norway Dunes, a 320-acre preserve located in Kittson County, Minnesota, and owned by The Nature Conservancy, is named for the parabolic sand dunes found within its boundaries. These dunes are covered with oak sand savanna, a natural community that is threatened in Minnesota. This oak sand savanna harbors four plant species that are also threatened or of special concern in the state. A deciduous forest and four types of wetlands are other natural communities on the preserve. During a vascular plant survey of the tract, 207 species were collected. Some of these species represent range extensions within the state.
Additions And Confirmations To The Algal Flora Of Itasca State Park I. Desmids And Diatoms From North Deming Pond, Huan Ngo, Gerald W. Prescott, David B. Czarnecki
Additions And Confirmations To The Algal Flora Of Itasca State Park I. Desmids And Diatoms From North Deming Pond, Huan Ngo, Gerald W. Prescott, David B. Czarnecki
Journal of the Minnesota Academy of Science
The summer desmid and diatom flora of North Deming Pond in lake Itasca State Park is presented. One hundred sixty desmid taxa representing 23 genera are recorded. Of these, 15 taxa appear to be park records and 82 are apparently Minnesota records. The desmid genera, Closterium, Cosmarium, Euastrum, Micrasterias, Pleurotaenium, and Staurastrum display the most taxa. The 136 diatom taxa recorded represent 27 genera. More than half of the taxa are assignable to the genera Eunotia, Navicula, Neidium, and Pinnularia. Given the brief and cursory nature of this study, the taxomic representation of these algae indicates high species richness and …
Range Extensions For Orchis Spectabilis, Corallorhiza Trifida, And C. Striata In Minnesota, Charles I. Argue
Range Extensions For Orchis Spectabilis, Corallorhiza Trifida, And C. Striata In Minnesota, Charles I. Argue
Journal of the Minnesota Academy of Science
The Showy Orchis, the Striped Coral-root, and the Early Coral-root are reported as new additions to the orchid flora of Otter Tail County. The records for the first two species provide notable range extensions within Minnesota and represent, respectively, the most northern and southwestern localities thus far recorded for these species in the state
Growth And Mortality Of Shoots In Three Populations Of Typha Glauca Godr., John Michael Penko, Douglas C. Pratt
Growth And Mortality Of Shoots In Three Populations Of Typha Glauca Godr., John Michael Penko, Douglas C. Pratt
Journal of the Minnesota Academy of Science
A double sampling technique and permanent quadrats were used to monitor seasonal changes in shoot density and aboveground standing crop in three Minnesota Typha glauca populations. Shoot growth began several weeks later in stands located in floating mats (Boot Lake and Cedar Creek) relative to a nonfloating stand (Lauderdale). Mortality reduced shoot density by 10.8% at Boot Lake, 6.3% at Cedar Creek, and by 53% at Lauderdale. Shoot death was largely confined to smaller than average shoots at Boot Lake and Cedar Creek. At Lauderdale many relatively large shoots were killed by a lepidopteran stem borer (Archanara oblonga Grt.) or …
Frontiers In Plant Science: Transcripts From A Symposium Sponsored By The Minnesota Academy Of Sciences, Gretchen Hagen, David D. Biesboer
Frontiers In Plant Science: Transcripts From A Symposium Sponsored By The Minnesota Academy Of Sciences, Gretchen Hagen, David D. Biesboer
Journal of the Minnesota Academy of Science
No abstract provided.
Fungicides For Control Of Pythium Ultimum On Greenhouse-Grown Geraniums, Nancy L. Olson, F. L. Phleger
Fungicides For Control Of Pythium Ultimum On Greenhouse-Grown Geraniums, Nancy L. Olson, F. L. Phleger
Journal of the Minnesota Academy of Science
Subdue 2E applied by drench at 18.7 ppm to soil inoculated with Pythium ultimum and in which rooted cuttings of geranium had been planted, was found to be free of the fungus during the test period of 30 days and caused no injury to the plants. Banrot 40W at 240 ppm and Truban 25E at 145 ppm were only slightly fungistatic.
Ultrastructure Of Flagellated Chrysophytes. Iv. Chrysosphaerella, Daniel E. Wujek
Ultrastructure Of Flagellated Chrysophytes. Iv. Chrysosphaerella, Daniel E. Wujek
Journal of the Minnesota Academy of Science
Information on the fine structure of naturally occurring cells of Chrysosphaerella brevispina and C. longispina is given and some new data are presented. The ultrastructure is generally typical for the Chrysophyceae although both perinuclear cisternae and cytoplasmic endobiotic bacteria occur. A paraflagella rod occurs in the photoreceptor area of the short, second flagellum. Siliceous scale and bristle origin are illustrated.
Lentinus Edodes Colonization Of Oak Is Enhanced By Log Treatment With Methyl Bromide, Elmer L. Schmidt
Lentinus Edodes Colonization Of Oak Is Enhanced By Log Treatment With Methyl Bromide, Elmer L. Schmidt
Journal of the Minnesota Academy of Science
Two or more years of outdoor incubation of inoculated oak logs are required before shiitake (Lentinus edodes [Berk.] Sing.) mushrooms appear; methods to accelerate the rate of oak sapwood colonization should reduce this incubation period. Observed increased mold growth of oak sapwood fumigated with methyl bromide (MB) prompted an experiment to determine whether such treatment would enhance oak colonization by L. edodes. Red and bur oak bolts ( 1 m long) were inoculated three weeks after felling. Half of the bolts were fumigated with MB ( 100 g per m3 of space beneath a plastic tarp) for three days, then …
Vascular Plants, Excluding Island Sites, Of Lake Of The Woods County, Minnesota, Janet Boe
Vascular Plants, Excluding Island Sites, Of Lake Of The Woods County, Minnesota, Janet Boe
Journal of the Minnesota Academy of Science
It is likely that almost 150 newly-recorded items were collected and identified during a study of the vascular flora of Lake of the Woods county on Minnesota's northern border with Canada. This collection apparently extended the known range of a number of plants within the state and also noted sites of several plants of which there are only a few collections in Minnesota The study was conducted as part of the author's Master of Science degree program at the University of Minnesota.
Catalase Activity In Crown Galls, Helianthus Annuus, Mark C. Bildsoe
Catalase Activity In Crown Galls, Helianthus Annuus, Mark C. Bildsoe
Journal of the Minnesota Academy of Science
Crown gall is a neoplastic disease in plants initiated by a specific bacterium, Agrobacterium tumefaciens. The objective of this investigation was to describe quantitatively the relationship between the autonomous growth of crown galls and the activity of the metabolic enzyme catalase. The catalase bioassay revealed a substantial increase In the amount of catalase present in tumor tissues as compared to corresponding healthy tissues in Helianthus annuus. Observations concerning growth activity of the two tissues indicated a significant growth increase in the crown galls.
Introduced Annual Eriogonum In Minnesota, Charles L. Argue, Steven R. Argue
Introduced Annual Eriogonum In Minnesota, Charles L. Argue, Steven R. Argue
Journal of the Minnesota Academy of Science
A selected summary of the utility of data derived from the recording and analysis of immigrant plant species is considered in relation to an apparently Introduced Minnesota population of Eriogonum annuum Nutt., the Annual Eriogonum. Fruiting specimens and one flowering-specimen of this species, heretofore reported on xeric sites from the western Dakotas, Montana, and Wyoming south into Mexico, were collected October 13, 1982, on the Sherburne National Wildlife Refuge near Zimmerman, Minnesota, and represent the first records of an Eriogonum in this state.
Nutritional Preferences Exhibited By Plants In Ad Libitum Feed Systems, L. A. Errede
Nutritional Preferences Exhibited By Plants In Ad Libitum Feed Systems, L. A. Errede
Journal of the Minnesota Academy of Science
Ad libitum feeding plant systems fitted with two reservoirs were used to monitor daily aqueous uptake by plants from paired reservoirs. When the reservoirs contained aqueous solutions of the same chemical composition, a plant accepted nourishment from alternate sources without bias; but when the reservoirs contained different aqueous solutions, i.e. either tap water or standard nutrient solution, a sharp bias was exhibited, depending on the plant's need for mineral nutrient, which changed with time. Eventually a "stable-end-state" was attained, favoring water over the standard nutrient solution in the ratio of 3 to 1. When the plant was pruned severely, however, …
Scaled Chrysophycae From Lake Itasca Region I. Mallomonas, Daniel E. Wujek, Michael M. Weis, Robert A. Anderson
Scaled Chrysophycae From Lake Itasca Region I. Mallomonas, Daniel E. Wujek, Michael M. Weis, Robert A. Anderson
Journal of the Minnesota Academy of Science
By means of electron microscopy, phytoplankton samples from the Lake Itasca region were examined for the silica-scaled chrysophycean genus Mallomonas. Seventeen taxa were observed: 15 are new for Minnesota, of these 15, seven are also new reports for the continental United States.
Initiation And Early Development Of Axillary Buds In Cyclamen, Marshall D. Sundberg
Initiation And Early Development Of Axillary Buds In Cyclamen, Marshall D. Sundberg
Journal of the Minnesota Academy of Science
The development of axillary buds along the primary shoot axis of Cyclamen persicum Mill. F-1 Rosemunde .was examined. Vegetative buds usually formed in the axils of the cotyledon and first 5 leaves. Flowers were produced from the majority of the buds which developed in the axils of later-formed leaves. The first indication of vegetative bud development was the appearance of a shell zone. Proliferation of the cells set off by this zone soon led to the establishment of a branch shoot apex producing leaf primordia. Formation of a shell zone was not associated with the initiation of floral buds. These …
Photoperiodicity In Adsuki Beans, A Preliminary Report, Thomas W. Clapp, Vivian L. Johnson
Photoperiodicity In Adsuki Beans, A Preliminary Report, Thomas W. Clapp, Vivian L. Johnson
Journal of the Minnesota Academy of Science
One variety, Adsuki beans (Phaseolus angularis or Vigna angularis) has been demonstrated to be photoperiodically sensitive, flowering within fifty days or in the three to five internode stage when grown under "short day" conditions and remaining vegetative for at least 70 days or past the 12 internode stage under "long day" conditions.
In Vitro Experiments On Totipotency Of Dacus Carota, Karl L. Ruser
In Vitro Experiments On Totipotency Of Dacus Carota, Karl L. Ruser
Journal of the Minnesota Academy of Science
The intent of this project was to induce the totipotency of carrot cells in tissue culture. The information gathered would be applied to work with woody plants. Differentiated cells removed from the root were cultured in vitro using a modified White's medium. Callus was initiated and successfully sub cultured. Roots and the production of chlorophyll have been initiated in the cultures. Because some specialized equipment and facilities for tissue culture were not available at the beginning of the project, it took considerable time to gather and improvise them. A roller tube culture mixer was constructed, using the mechanism from a …
Unialgal Growth Of Anabaena And Dictyosphaerium In Lake Itasca, Charles P. Mason
Unialgal Growth Of Anabaena And Dictyosphaerium In Lake Itasca, Charles P. Mason
Journal of the Minnesota Academy of Science
A relatively new field technique was employed to determine the growth of algae in natural waters. Anabaena sp. (Cyanophyta) and Dictyosphaerium sp. (Chlorophyta) were grown in separate membrane filter chambers situated in Lake Itasca and LaSalle Lagoon, a sewage effluent pond. Physical and chemical determinations before and after each two-week experiment were correlated with changes in algal biomass. Wet weight determinations of Anabaena were twice as great in the lake as in the sewage lagoon, while Dictyosphaerium growth was the same in both habitats. Nitrogen (nitrate and nitrite) was 0.09 • 0.2 mg/1 in the lagoon and from less than …
The Elongation Of The Leaf Of Cyclamen Persicum Mill. (Cultivars), Marshall D. Sundberg
The Elongation Of The Leaf Of Cyclamen Persicum Mill. (Cultivars), Marshall D. Sundberg
Journal of the Minnesota Academy of Science
The leaves of three cultivars of Cyclamen persicum were examined at several stages of development in order to determine the pattern of elongation in both the lamina and petiole. Although there is a considerable literature on lamina elongation, relatively little is known about the growth of the petiole. In the latter structure it is usually assumed that an intercalary meristem is involved. Elongation of the young leaf is initially due to activity distributed throughout the deve1opint organ. Maturation of the leaf progresses acropetally from the base of the petiole and basipetally from the tip of the lamina. As the leaf …
Effects Of Nutrients On Productivity And Morphology Of Typha Angustifolia X Latifolia, V. Bonnewell, D. C. Pratt
Effects Of Nutrients On Productivity And Morphology Of Typha Angustifolia X Latifolia, V. Bonnewell, D. C. Pratt
Journal of the Minnesota Academy of Science
The productivity of natural stands of cattails (Typha latifolia) has been correlated with the amounts of nutrients in the soil and water by Boyd and Hess (Ecology, 51: 296, 1970). The direct effects of varying levels of nitrogen (N), phosphorus (P) and potassium (K) on productivity were examined in our study by growing cattails in Hoagland's nutrient solution. Concentrations of ¼, 1/16, and 1/64 the amount of N present in complete Hoagland's solution (0.01Ml resulted in 63 percent, 48 percent and 26 percent of the dry weight of plants grown in complete solution. Rhizomes used to start plants contained considerable …
Pollen Of The Myricaceae - A Preliminary Report, Marshall D. Sundberg
Pollen Of The Myricaceae - A Preliminary Report, Marshall D. Sundberg
Journal of the Minnesota Academy of Science
Pollen of 16 species and one variety of the Myricaceae was examined, including members of each of the genera proposed by Chevalier (1901) in addition to Canacomyrica (Guillaumin, 1939). Comparison of pollen characters within genera, within sections, between sections, and between genera suggests that the Myricaceae can be divided into four genera: Canacomyrica; Comptonia; Gale; and Myrica. The genus Myrica can be further divided into three sections; Cerophora, Fava, and Morella.
Response Of Setaria Faberii To High Lime Soils, Nancy Huang, Russell S. Adams Jr.
Response Of Setaria Faberii To High Lime Soils, Nancy Huang, Russell S. Adams Jr.
Journal of the Minnesota Academy of Science
Setaria faberii (giant foxtail) was observed to grow poorly in some calcareous soils or upon the addition of calcium carbonate to some acid soils. The data suggest that liming might be a feasible and practical tool in the control of this major weed pest.
Wood-Rotting Basidiomycetes--Itasca State Park Annotated List, Robert L. Gilbertson, Frances F. Lombard
Wood-Rotting Basidiomycetes--Itasca State Park Annotated List, Robert L. Gilbertson, Frances F. Lombard
Journal of the Minnesota Academy of Science
This study reports 216 species of wood-rotting Basidiomycetes from Lake Itasca State Park in Minnesota. Of these, two species, Gloeocystidiellum heimii Boid. and Phanerochaete cumulodentata (Nikol) Parm., are reported for the first time from North America.
Regulating Growth Of An Aquatic Plant: Lemna Perpusilla, Willard L. Koukkari, Stanley H. Duke
Regulating Growth Of An Aquatic Plant: Lemna Perpusilla, Willard L. Koukkari, Stanley H. Duke
Journal of the Minnesota Academy of Science
Growth rates of Lemna perpusilla 6746 can be regulated in axenic cultures by 6-benzylaminopurine (BA) . Concentrations of 10-BM BA significantly enhanced growth, while levels of 10-7M and Higher were inhibitory. These effects of BA on growth were evident when calculated as either fresh weight of frond number.