Plant Biology Commons^™

A Solid Phase Extraction System For The Isolation Of The Germination Cue In Smoky Water When Subjected To The Light Sensitive Lettuce Lactuca Sativa V. Grand Rapids, Troy David Adriansz

Theses : Honours

The search for the chemical or set of chemicals that act as a germination stimulant in Lactuca sativa v. Grand rapids (a variety of lettuce seed) was the underlying basis of this project. Through the development of a solid phase extraction (SPE) system different fractions of smoky water were tested for their effects on germination enhancement. The project targeted streamlining the amount of solvents as well as time used in past research on smoky water. Previously, several steps involving high perfo1mance liquid chromatography (HPLC), thin layer chromatography (TLC) and Gas Chromatography (GC) were employed. This project used SPE cartridges to …

The Method Of Radicle Emergence In Phytolacca Americana (Pokeweed), Staci A. Van Winkle

Honors Theses

Germination is a key element in the development of a plant. This process encompasses several stages, one of which is the elongation of the radicle tip. This process has been noted to occur by different methods such as rapid mitotic division or cell elongation. However, such a mechcmism has not been studied in Phytolacca americana (pokeweed). It was the intention of this study to observe at the cellular level the nature of the Phytolacca americana radicle during normal germination. This was done using a routine histological microtechnique which involves embedding in paraffin and sectioning with a microtome. The sections were …

The Effects Of Berry Extracts From Phytolacca Americana (Pokeweed) On Seed Germination, Kevin Blake Anderson

Honors Theses

Extracts from the berries of Phytolacca americana (Pokeweed) exhibit the ability to inhibit germination of a variety of seeds, including its own. This inhibition has been shown to be effective even in dilute samples of the extracts. However, it is not known whether the germination inhibition caused by these extracts is induced by physical or by chemical mechanisms. This research proposes that the germination inhibition is induced by chemical inhibitors present within the berries. In an attempt to uncover the chemical agent(s) responsible for the germination inhibition characteristics exhibited by berry extracts of Phytolacca americana (pokeberry extracts), several separation techniques …

The Role Of The Seed Coat In The After-Ripening Process Of American Pokeweed (Phytolacca Americana L.), Jason E. Cox

Honors Theses

As plants evolve into new forms and shapes, the reproductive structures are often the last to change because of the importance of successful reproductive organs to the survival of the plant's hereditary information. Because of this particular feature, one very common method of determining how advanced a species is evolutionarily is the study of its reproductive cycle (Gifford and Foster, 1989). A few advanced classes, most notably the general class groupings of the Gymnosperms and Angiosperms, have developed seeds as a part of their reproductive cycle. Normally, there are several stages through which the seed must go in order for …

An Investigation Of The Allelopathic Effects Of Pokeweed (Phytolacca Americana L.), Angela Rambalakos

Honors Theses

Phytolacca americana L., or common pokeweed, is a tall, branching, perennial herb whose uses range from the preparation of certain medicines to being cultivated as a vegetable. At the same time, however, pokeweed is also a highly poisonous plant and certain precautions must be taken in utilizing this weed. The following paper opens with a description of P. americana including its habitat, range, structure, uses, and toxicity. The second part of this paper will investigate the topic of allelopathy - its history and its future. The final section of this paper involves a series of laboratory experiments conducted to examine …

The Allelopathic Effects Of Pokeweed (Phytolacca Americana) Berry Juice, Steven R. Parris

Honors Theses

This paper is divided into three major sections. The first section is a limited overview of the field of allelopathy, from its origins to its potential future. Since the field of allelopathy is relatively young and there are only a very few texts on allelopathy available, much of this information is taken directly from journal articles. The second section reviews the publications concerning Phytolacca americana (pokeweed) and some of its close relatives, as well as information on a number of interesting and potentially useful compounds that have been isolated from them. The third section describes a series of laboratory experiments …

The Effects Of Selected Pre-Germination Treatments On Six Species Of Summer And Winter Annual Plants Of The East Mojave Desert, James R. Earsom

Theses Digitization Project

No abstract provided.

Faster Weed Germination With Early Cultivation, Geoffrey A. Pearce

Journal of the Department of Agriculture, Western Australia, Series 4

The key to cultural control of weeds in cereal crops is an understanding of the factors which govern germination of the weed seeds.

Covering the seed with soil keeps out light, provides a stable moisture supply and makes germination faster than if the seed is left on the soil surface.

Shallow cultivation at the start of the growing season provides the soil cover needed for fast, even germination of weed seeds.

Germination And Early Development Of The Silky Prairie Clover, Richard B. Forbes

Journal of the Minnesota Academy of Science

Field and laboratory studies of the silky prairie clover (Petalostemon villosum Nutt.) in central Minnesota indicated that seeds of this plant require scarification but do not require an overwintering period, to germinate. Germination and primary root growth are rapid; shoot growth appears to be quite slow. Methods of associating shoot growth with age are suggested and several notes on the life history of the plant ore presented.

The History Of Germinating Embryos Of The Eastern Dwarfmistletoe (Arceuthobium Pusillum Peck), Frank H. Tainter

Journal of the Minnesota Academy of Science

Embryos of germinating seeds of Arceuthobium pusillum have four histological zones: the protoderm of the radicular apex, which remains distinct throughout germination and through anticlinal divisions gives rise to the epidermis; the procambium, which matures into a simple vascular strand in the mature radicle; the ground meristem, which matures into the cortex; and the promeristem, from which the procambium and ground meristem are derived.

Germination Of Seeds Of Perennials Native To The Minnesota Region, May L. Wright

Journal of the Minnesota Academy of Science

Requirements for the germination of the seeds of herbaceous perennials native to the Minnesota region are given in general. Examples of specific requirements are noted for certain plant species.

The Effects Of Thermal-Neutron Irradiation Of Maize And Barley Kernels, John W. Schmidt, E. F. Frolik

Nebraska Agricultural Experiment Station: Historical Research Bulletins

It is the purpose of this paper to report the effects of thermal-neutron irradiation of maize and barley kernels on subsequent germination, plant establishment, and early plant development. Comparisons are made with equivalent neutron treatments of maize pollen, results of which have been reported in part in previous publications.