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A Flora From The Dakota Sandstone Formation Near Westwater, Grand County, Utah, Samuel R. Rushforth
A Flora From The Dakota Sandstone Formation Near Westwater, Grand County, Utah, Samuel R. Rushforth
Theses and Dissertations
A cretaceous (Cenomanian) flora from the Dakota Sandstone Formation near Westwater, Grand County, Utah contains an admixture of ferns and angiosperms. The ferns of this flora are representative of an older Jurassic-Wealden vegetational type, whereas the angiosperms are typical of the modern vegetational type. Species of Gleichenia and Matonidium and Astralopteris coloradica represent the dominant forms in this flora. The Westwater flora contains fourteen genera including nineteen species and one variety. New species described from this flora include Asplenium dakotensis, Coniopteris westwaterensis and Ilex serrata.
The Effects Of 2-Chloro-4-Ethylamino-6-Isopropylamino-S-Triazine (Atrazine) On The Activities Of Certain Calvin Cycle Enzymes In Barley And Corn, L. Chris Harrison
The Effects Of 2-Chloro-4-Ethylamino-6-Isopropylamino-S-Triazine (Atrazine) On The Activities Of Certain Calvin Cycle Enzymes In Barley And Corn, L. Chris Harrison
Theses and Dissertations
Atrazine (2-chloro-4, ethylamino-6-isopropylaminos- triazine) applied to Hordium vulgare L. variety barbless in low concentrations (0.001, 0.01, 0.1 uM) was shown to in-- crease the activity of D-ribulose-1, 5-diphosphate carboxylase (RuDPCase) and phosphoribulokinase (PRuK) up to 23% and 30% respectively and increase the amount of chlorophyll and extractable protein up to 18% and 21% respectively over the control plants. These results indicate that sub-toxic levels of atrazine significantly stimulate plant growth. Barley plants given higher concentrations of atrazine (1.0 and 10 uM) showed up to a 78% and 42% decrease in the activity of RuDPCase and PRuK respectively as well as …
Aquatic And Semi-Aquatic Plant Communities Of Utah Lake, Robert E. Coombs
Aquatic And Semi-Aquatic Plant Communities Of Utah Lake, Robert E. Coombs
Theses and Dissertations
The aquatic and semi-aquatic plant communities of Utah Lake, Utah County, Utah are discussed. This discussion includes the methods of describing and delimiting the major vascular plant communities, the descriptions of the present existent communities, and the determination of the vegetational changes, particularly since 1925. The vegetation around Utah Lake is divided into plant communities. Each community is discussed using: (a) quantitative data, (b) field observations, (c) general and specific locations of the community, and (d) interrelationships and trends of the community. Historical vegetational changes of Utah Lake plant communities are discussed. In this discussion, the plant communities described by …
A Comparison Of Vegetation Changes In A Mountain Brush Type After Grazing And Protection From Grazing During Thirty-Seven Years, Jerry William Thomas
A Comparison Of Vegetation Changes In A Mountain Brush Type After Grazing And Protection From Grazing During Thirty-Seven Years, Jerry William Thomas
Theses and Dissertations
The mountain brush type in Utah was studied in 1932, 1942, and 1969 to determine the vegetation changes and trends after grazing and protection from grazing for 37 years. Analyses for cover, frequency and composition percentages, production and plant counts were made on fifty 100 square-foot plots in a ten-acre exclosure and on a five-acre grazed area adjacent to the exclosure. Production, cover and composition percentages for good and fair forage species of grasses and browse have decreasesed on the grazed plots whereas they generally increased in the ungrazed plots. Forbs of intermediate forage value have increased in production, cover …
The Effects Of Euploid Changes In Chromosome Number On Various Physiological Factors In Tomatoes, Barley And Rye, Larry Wayne Peterson
The Effects Of Euploid Changes In Chromosome Number On Various Physiological Factors In Tomatoes, Barley And Rye, Larry Wayne Peterson
Theses and Dissertations
Leaf tissue of diploid, triploid, and tetraploid tomatoes (var. UF-36) and diploid and tetraploid barley (var. Steel and Midsummer) were analyzed for total chlorophyll, soluble protein, dry weight, ribulose-1,5-diphosphate carboxylase, phosphoribulokinase, and peroxidase. Polyploidy caused a slight increase of all factors in Midsummer rye, had a variable effect on Steel rye and Everest barley, and caused a reduction in tomatoes and Barbless barley when the factors were determined on a fresh weight basis. In tomatoes, if the ribulose-1,5-diphosphate carboxylase activity was determined on protein content, dry weight or cell number the tetraploid form had higher activity than the diploid form. …
The Effect Of Alternate Year Rest Rotation Grazing On Carbohydrate And Nitrogen Reserves In Crested Wheatgrass, James B. Wood
The Effect Of Alternate Year Rest Rotation Grazing On Carbohydrate And Nitrogen Reserves In Crested Wheatgrass, James B. Wood
Theses and Dissertations
A field and laboratory study was made to determine the effect of alternate year rest rotation grazin in stem bases and root crowns of crested wheatgrass. Analyses for carbohydrate reserves and total nitrogen were made for the following treatments: (1) exclosures; (2) open range; (3) agronomy cages. Both carbohydrate concentration and total nitrogen content showed differences between sampling dates but did not show differences as a result of grazing treatment on individual dates. Differences between sampling dates were associated with season and growth stage of plants. Although differences due to grazing teatment were not shown for individual dates the combined …