Plant Biology Commons^™

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.

Organization Of The Primary Body In The Root Of Cyclamen Persicum Mill, Marshall D. Sundberg

Journal of the Minnesota Academy of Science

The primary body of the root of Cyclamen persicum Mill. is described. The rootcap consists of two components of separate origin. Cells of the columella are derived from the dermatocalyptrogen by periclinal wall formation. Further growth of the columella is due primarily to the increase in size of existing cells. Cells of the lateral rootcap arise from the protoderm by periclinal wall formation. Continued growth in this region is due to both increase in cell number and increase in size of existing cells. Proximal to the dermatocalyptrogen is the presumptive quiescent center. Around the periphery of this zone are located …

Influence Of Soil Acidity On The Occurrence Of Athiorhodaceae, Eville Gorham, Douglas C. Pratt

Journal of the Minnesota Academy of Science

Enrichment cultures from strongly acid Sphagnum bog peats and moderately acid to circumneutral fen peats revealed Athiorhodaceae to be present in almost all suitably wet samples above pH 5.3 and absent from almost all samples below pH 4.7. These bacteria were recorded in only one of fifty cultures from acid humus layers in a jack pine forest, and in none of thirty cultures from moderately acid humus layers in a mixed woodland. They were also absent from old-field surface soils, which often contained considerable amounts of organic litter.

Development Of Vascular Connections Between Lateral Buds And Main Stem In Some Decapitated Plants, Syed Mushtaq Husain, Albert J. Linck

Journal of the Minnesota Academy of Science

After decapitation of pea plants, with resultant growth of lateral buds, the thickness of vascular tissue appeared to be correlated with the growth rate of buds. Basal lateral shoots had better developed vascular strands than buds on upper parts of the plants. IAA application retarded growth of the lateral buds and inhibited their vascular connections, but all lateral buds eventually grew in spite of the IAA application.

A Disc Electrophoretic Procedure For Separating Proteins Of Marchantia Polymorpha: Esterases., Jerome Anaya, Donald J. Kraft

Journal of the Minnesota Academy of Science

Extracts from Marchanlia polymorpha were used in the development of a disc electrophoretic procedure for the separation of proteins. Dialyzed and fresh extracts were found to produce best resolution when electrophoresed in Tris-Glycine buffer (pH 8.3) and 50 millamps current for 45-60 minutes. The esterase enzyme system was used as an indication of separation. Significantly, 5 bands were detected in induced thalli attesting to the sensitivity and application of this method to developmental studies.

Estimating Surface Area Of Soybean Root Systems, John B. Carlson

Journal of the Minnesota Academy of Science

A procedure for estimating the total root length, root surface, and root hair surface is described for greenhouse-grown soybeans. Data are presented on the extent of the root systems of 3-week and 14-week old soybeans. The possibility of correlating data from greenhouse-grown soybeans with that of field-grown soybeans as a method to make some predictions on extent of the root systems of field-grown soybeans is suggested.

Seasonal Chlorophyll Change In A Leafy Liverwort, Richard L. Anderson, Edward Flaccus

Journal of the Minnesota Academy of Science

It is known that chlorophyll content of plant material varies with the season of the year, though the fact is sometimes lost sight of in studies of particular plant communities. Measurement of seasonal changes has been more often done with higher plants: e.g., Compton and Boynton (1945), Bordeau ( 1959). But Myiata and Hosokowa (1961) studied these changes in epiphytic mosses as correlated with photosynthetic efficiency.

This paper reports on a study made during 1963-1964 of the chlorophyll content of the leafy liverwort, Scapania nemerosa (l.) Dumort, measured at monthly intervals for a period of one year. This plant material …

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.

A Preliminary Report On The Comparative Morphology Of The Shoot Apex Of Isoetes Macrospora Dur. And Some Effects Of Experimentally Applied Indole-3-Acetic Acid And Gibberellic Acid, Daniel R. Zinda

Journal of the Minnesota Academy of Science

Isoetes macrospora Dur. was found growing in 20 inches to 4 ft. of water in several sandy-bottomed lakes in Itasca County, Minnesota. The pH of the lakes was about 6 and the characteristic tree species of the immediate shorelines were: Thuja occidentalis, Pinus resinosa, Abies balsomea, Populus tremuloides, and Betula papyrifera. Experimental and normal plants were grown submerged in 1-liler beakers in the greenhouse for the 2-week experimental period. The normal shoot apex of /. macrospora is described as having three zones. Zone I, the metrameristem, consists of the superficial layer of initials which divide usually by anticlinal divisions and …

Variations In Porphyrin Content In Root Nodules, Marie H. Berg

Journal of the Minnesota Academy of Science

The root nodules of a series of legumes were investigated with and without inoculum in sterilized growing material as well as in open soil to find plants that synthesize extractable amounts of porphyrins. These experiments were a preliminary study toward the investigation of the influence of heavy metal salts on the increased production of porphyrins.

The Wild Celery Of Christmas Lake, Hibbert Hill

Journal of the Minnesota Academy of Science

The growth and reproduction of Vallisneria as seen and photographed below water in Christmas Lake, Hennepin County, Minnesota, is described. The functions of the water surface film, of wave energy, and of the coiled stem of the pistillate flower, in fertilization is discussed. It is found that many of the plants grow in such depths that fertilization is impossible.

A Comparative Study Of Wood Pulp From The Trunk, Limbs, And Roots Of The Quaking Aspen (Populus Tremuloides), John Vernanth, Raynell Walker, Ann Johnson

Journal of the Minnesota Academy of Science

A three part study was conducted on a single quaking aspen tree (Populus tremuloides): ( l) the strength and other physical properties of fiberboard made from the trunk, roots, and limbs using the cold soda pulping process, (2) the strength properties of paper made from the trunk, root, and limb sections using the Kraft pulping process, and (3) a chemical analysis of the trunk, roots, and limbs. Results of these studies indicate there are significant differences in many of the properties of the three parts of the tree, and that parts of the tree other than the trunk possess useful …

The Production Of Arsenous Gases By Wood-Rotting Fungi, William Merrill, D. W. French

Journal of the Minnesota Academy of Science

Approximately 120 years ago in Europe is was learned that certain fungi liberated arsenous gases when they were grown on substrates containing arsenic. This was especially apparent when certain molds grew on paste on wall paper in damp rooms, converting arsenic-containing pigments in the wall paper into a gas with a garlic-like odor. This resulted in numerous cases of arsenic poisoning of people living in these rooms; some of these people died. The identity of the gas was unknown until 1932 when Challenger and his co-workers demonstrated that it was trimethylarsine ( CH3 )a As ( 3). Several species of …

The Translocation Of Foliar Applied P-32 In Field Grown Corn, With Respect To Fruit Development, Theodore W. Sudia, Lauren E. Carlson, George E. Ahlgren

Journal of the Minnesota Academy of Science

No abstract provided.

Eucalypts Of Australia, Thor Kommedahl

Journal of the Minnesota Academy of Science

No abstract provided.

Nutritive Value Of Red-Osier Dogwood And Mountain Maple As Deer Browse, Bernard A. Fashingbauer, John B. Moyle

Journal of the Minnesota Academy of Science

No abstract provided.

The Effect Of Iron Deficiency On The Absorption And Translocation Of Iron And Phosphorus By Soybean Plants, D. P. Penner, A. J. Linck

Journal of the Minnesota Academy of Science

No abstract provided.

Minnesota Species Of Aleurodiscus, Harvey E. Stork

Journal of the Minnesota Academy of Science

No abstract provided.

Some Higher Fungi In The Vicinity Of Winona, Sister M. Sylvia

Journal of the Minnesota Academy of Science

No abstract provided.

Descriptions Of Iowa Uromyces, J. C. Arthur

Journal of the Minnesota Academy of Science

No abstract provided.