Digital Commons Network^™

Chromosomal Variation Of Claytonia Virginica L. In Illinois, Russell Arthur Hintz

Masters Theses

Thirty-one mass collections of Claytonia virginica were made in eight counties in the eastern half of Illinois. Chromosome counts of pollen mother cells were determined for plants from Richland, Coles, Clark, Douglas, Cook and Moultrie counties. A range of 2n = 8 to 48 was determined with only 4 of the 89 counts being greater than 2n = 30. For all the populations, counts of 2n = 8, 10, 12, 14, 15, 16, 17, 18, 19, 20, 21, 22, 24, 27, 28, 29, 30, 37, 38, 44, 48 were reported. The two most common counts were 2n = 18 and …

A Taxonomic And Ecological Study Of The Cladonia Species Of The Central Portion Of Fox Ridge State Park In Coles County, Illinois, James L. Jannesse

Masters Theses

Extensive collections were made on the central ridge system at Fox Ridge State Park in Coles County, Illinois. A literature review of the works on the genus Cladonia in North America encompassed major taxonomic collections undertaken in the last 20 years. Also, a historical account on the developments in the Cladonia chlorophaea complex are listed. Basic Cladonia morphology is described, including both microscopic and macroscopic illustrations. The study area was subdivided on a grid system, enabling the collection sites to be numbered. The entire area was covered in two foot intervals. From every entity that was found, ¼ of it …

Translocation Of C14-Labeled Assimilates In Squash Petioles, William John Raupp

Masters Theses

A qualitative analysis of sieve tube sap was undertaken to help determine the method of assimilate movement in phloem. Hydroponically-grown squash plants (Cucurbita melopepo torticollis Bailey) were trimmed to a mature, fully-expanded leaf (the source) and one or more immature, unexpanded leaves (the sinks). The blade of the source leaf was exposed to C¹⁴O₂ in air for 10 minutes and allowed to translocate for 20 or 50 minutes in ambient air. Petioles of treated leaves were cut into sections and ground in cold buffer with a chilled mortar and pestle to extract materials from the translocation stream. …

Biosystematic Studies Of Impatiens Pallida And Impatiens Biflora (Balsaminaceae), Sandra M. Buening

Masters Theses

Impatiens pallida Nutt. and Impatiens biflora Walt. are two closely related species which grow together in mixed populations but do not hybridize. Flower buds of each species were enclosed with glycine bags to prevent insect pollination. These were left isolated until after anthesis to test for self-pollination and self-compatibility. Neither capsule formation nor seed set were observed.

Chromosomal smears showed that each species has a haploid number of ten chromosomes. Polyploidy was not observed.

Field observations of insect pollinators (primarily bees) showed indiscriminate visitation.

Flower buds were again bagged as before. During anthesis, individuals of the two species were cross-pollinated …

Leaching Of An Acetanilide Herbicide, Cp55097 In Soil Columns, Regina K. Higgins

Masters Theses

The leachability of the acetanilide herbicide, CP55097 was determined using a soil column system. This herbicide, which is used as a preemergent against certain grasses and broadleaf weeds, was leached through four different soils (sandy clay, sandy loam, sandy clay loam and clay loam) using the following procedure. Plastic columns consisting of 8 rings (2 in. dia. x 1 in.) were assembled and their bottoms covered with cheesecloth. They were then filled with soil and prewetted with water to attain field capacity. Herbicide concentrations equalling 0, 1, 3, 6 lb/A were pipetted onto the soil surface and 0, 1, 2, …