Life Sciences Commons^™

An Ecological Study Of An Exclosure In The Mountain Brush Vegetation Of The Wasatch Mountains, Utah, Elray S. Nixon

Theses and Dissertations

This is a comparative study of the vegetation and soils of an exclosure in the mountain brush vegetation of the Wasatch Mountains, Utah. The exclosure was fenced and initially analyzed during the summers of 1949-1950. The study area is located in Pole Canyon in the Uinta National Forest, a few miles northeast of Provo, Utah. The dominant woody species of the vegetation in the exclosure are big toothed maple (Acer grandidentatum) and Gambel oak (Quercus gambelii). After settlement of the area in and around Provo, Pole Canyon became overgrazed by livestock. Since 1949 the area has been protected from grazing. …

An Analysis Of A Hybrid Complex Involving Agropyron Subsecundum, Agropyron Trachycaulum And Elymus Glaucus, Lewis Kay Shumway

Theses and Dissertations

In the past twenty years many workers have made contributions to a better understanding of hybridization and introgression through studies of members of the grass family. The present study is an attempt to increase the understanding of the importance and amount of hybridization and introgression in members of the Tribe Hordeae. This study is concerned with a hybrid complex involving Agropyron subsecundum (Link) Hitchc. (bearded wheatgrass), Agropyron trachycaulum (Link) Malte (slender wheatgrass) and Elymus glaucus Buckl. (blue wild rye).

Classification And Distribution Of The Native Trees Of Utah, Kimball Steward Erdmann

Theses and Dissertations

This study is an attempt to consolidate the information already known about the trees of Utah and to extend our knowledge of these trees. An intensive study was made of the available literature. The tree specimens of the herbaria of the Utah State University, University of Utah, Brigham Young University and the Regional Office of the Forest Service at Ogden were examined. These studies were supplemented with extensive field work in various parts of the state. From this information, keys and descriptions of the genera and species were written and distribution maps for each tree and illustrations of many of …

An Inheritance And Linkage Study Of Barley With Special Emphasis On Purple Pigmentation Of The Auricle, Devon Lyle Doney

All Graduate Theses and Dissertations, Spring 1920 to Summer 2023

New and better adapted varieties of crop plants have resulted from the application of the principles of genetics. Fundamental research in the field of barley genetics has helped the plant breeder in developing better varieties for specific uses and adaptability.

Barley is one of the best cultivated crop plants for making genetic studies. It has a wide range of adaptability, exhibits a host of contrasting genetic characters, is a simple diploid with only seven pairs of chromosomes, and all the cultivated species are inter-fertile.

The mode of inheritance of nearly 200 characters has been studied, many of whose genes have …

Alfalfa Resistance To The Clover Seed Chalcid Bruchophagus Gibbus (Boheman), Gerald Douglas Minion

All Graduate Theses and Dissertations, Spring 1920 to Summer 2023

The destructive nature of the clover seed chalcid has been known since the latter part of the 19th century. This jet-black Hymenoptera, often called the "chalcis-fly," destroys from 10 to 20 percent of the alfalfa seed in Utah each year. Damage as high as 85 percent has been reported.

Use Of Gamma Radiation, Chemicals, And Packaging Films To Control Post Harvest Diseases And To Extend Refrigerated Life Of Strawberries And Cherries, Gerald M. Cooper

All Graduate Theses and Dissertations, Spring 1920 to Summer 2023

In recent years there has been a considerable amount of work done on developing chemicals that would inhibit mold growth when applied to fresh fruit, and at the same time, be acceptable to man when taken orally. This would save many thousands of tons of fresh produce that are lost each year by spoilage before it ever reaches the consumer. Along with the development of new chemicals to inhibit mold growth there is a substantial amount of research being done on developing a packaging film that will prevent recontamination of the produce, at the same time allowing the passage of …

The Use Of Tetrazolium As A Measure Of The Salt Tolerance Of Alfalfa, Daryl A. Freter

All Graduate Theses and Dissertations, Spring 1920 to Summer 2023

The task of obtaining and selecting plants which may not only survive under salty conditions, but grow and produce satisfactory yields is varied and complex. It is becoming necessary to select and breed crops for salt tolerance. Plants can be grown in artificially constructed salt basins to test their individual salt tolerance, but this takes time, at least one year. It would be desirable to develop a rapid test to determine the salt tolerance of a given plant. The use of a dye in conjunction with a series of salt solutions has been suggested for determining the salt tolerance of …

General And Specific Combining Ability Of Five Alfalfa Clones Including Reciprocal Effects For Seedling Vigor And Seed Yield, Edwin Theodore Bingham

All Graduate Theses and Dissertations, Spring 1920 to Summer 2023

The use of F₁ hybrids for commercial production of such cross-pollinated crops as corn, sorghum, sugar beets, onions, and pearl millet suggests the feasibility of using this technique for alfalfa. Production of F₁ hybrids of commercial value is dependent on the use of breeding material expressing good combining ability. In order to obtain precise estimates of combining ability for quantitative characters in alfalfa, it is necessary to produce all possible single crosses among a number of parents. The single cross seed required is difficult to obtain due to the vegetative reproduction and isolation required; and, subsequently, limited testing …