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Genetic Control Of The Metabolism Of O-Hydroxycinnamic Acid Precursors In Melilotus Alba, Francis A. Haskins, T. Kosuge
Genetic Control Of The Metabolism Of O-Hydroxycinnamic Acid Precursors In Melilotus Alba, Francis A. Haskins, T. Kosuge
Department of Agronomy and Horticulture: Faculty Publications
In sweetclover (Melilotus aIba Desr.) the cis and trans isomers of o-hydroxycinnamic acid occur primarily as the respective β-D-glucosides (Rudorf and Schwarze 1958; Kosuge 1961; Haskins and Gorz 1961a; Stoker and Bellis 1962). The review of Brown (1963) summarizes evidence that these glucosides are formed via the following pathway: phenylalanine (formed from shikimic acid) → trans-cinnamic acid → trans-o-hydroxycinnamic acid (o-coumaric acid) trans-β-D-glucosyl-o-hydroxycinnamic acid (o-coumaric acid glucoside) → cis-β-D-glucosyl-o-hydroxycinnamic acid (coumarinic acid glucoside). Sweetclover plants of the Cu Cu genotype contain substantial amounts of both …
Ultraviolet-Induced Isomerization Of Β-D-Glucosyl O-Hydroxycinnamic Acid On Filter Paper, Andris Kleinhofs, Francis A. Haskins, Herman J. Gorz
Ultraviolet-Induced Isomerization Of Β-D-Glucosyl O-Hydroxycinnamic Acid On Filter Paper, Andris Kleinhofs, Francis A. Haskins, Herman J. Gorz
Department of Agronomy and Horticulture: Faculty Publications
Coumarinic acid glucoside (β-D-glucosyl cis-o-hydroxycinnamic acid) and o-coumaric acid glucoside (β-D-glucosyl &am-o-hydroxycinnamic acid) are readily detected as absorbing areas on filter paper chromatograms exposed to ultraviolet light at wavelengths near 260 mp. Long wavelength ultraviolet radiation is frequently used to detect fluorescent compounds closely related to these two glucosides. The foregoing facts prompted this investigation concerning the influence of both long and short wavelength ultraviolet light on small amounts of coumarinic acid glucoside and o-coumaric acid glucoside, air-dried on filter paper strips. Ultraviolet-induced interconversion of these two isomers in aqueous solutions is well known.
Plant Communities: Native Vegetation Of Nebraska, J. E. Weaver
Plant Communities: Native Vegetation Of Nebraska, J. E. Weaver
Department of Agronomy and Horticulture: Faculty Publications
Thanks to our rapid increase in population ,and the largely indiscriminate spread of urban, industrial, and transport facilities, the time is not far distant when land-use capabilities must receive much more attention than they have enjoyed. Natural, that is pre-settlement, vegetation, integrating as it did the manifold factors of environment, is un-excelled as a guide to potential land use.
Absence Of Dominance Of The B Gene In Influencing Β-Glucosidase Activity In Melilotus Alba, Francis A. Haskins, Herman J. Gorz
Absence Of Dominance Of The B Gene In Influencing Β-Glucosidase Activity In Melilotus Alba, Francis A. Haskins, Herman J. Gorz
Department of Agronomy and Horticulture: Faculty Publications
In sweetclover (Melilotus alba Desr.) the allelic pair designated B/b was originally thought to be concerned with coumarin biosynthesis. Extracts of BB plants were reported to contain substantial amounts of both free and bound coumarin, while extracts of bb plants contained only bound coumarin (Goplen, Greenshields and Baenzinger 1957; Haskins and Gorz 1957), more recently identified as coumarinic acid glucoside (β-D-glucosyl-cis-o-hydroxycinnamic acid) (Kosuge 1961; Stoker and Bellis 1962). The bound-coumarin character behaved as a simple recessive in crosses between bb and BB plants (Goplen, Greenshields and Baenzinger 1957).
Native Vegetation Of Nebraska, J. E. Weaver
Native Vegetation Of Nebraska, J. E. Weaver
Department of Agronomy and Horticulture: Faculty Publications
Nebraska is in the central part of the prairie plains. Yet grassland is only one kind of its varied vegetation. A westward extension of the great deciduous forest occurs along the Missouri River. It is bordered by shrubs, patches of which occur in favorable places to the western border. The foothills of the northwest have a forest of pine not unlike that of the Black Hills. On the level lands and among the wind-blown hills of sand there are hundreds of lakes, swamps, and marshes. The Missouri, Platte, and Niobrara Rivers extend across the state. They and their numerous tributaries …
Peroxidase And Polyphenoloxidase Activities And Free Ninhydrin-Positive Substances In Underground Buds Of Ironweed And Leafy Spurge, W. G. Monson, Francis A. Haskins
Peroxidase And Polyphenoloxidase Activities And Free Ninhydrin-Positive Substances In Underground Buds Of Ironweed And Leafy Spurge, W. G. Monson, Francis A. Haskins
Department of Agronomy and Horticulture: Faculty Publications
Peroxidase activity in extracts of underground buds of ironweed and leafy spurge was at the lowest level during the period of dormancy in both species, and increased when dormancy was broken. Polyphenoloxidase activity of bud extracts was high for ironweed and very low for leafy spurge, and showed no relationship with dormancy in either species. Ninhydrin-positive substances generally and sulfur-containing amino acids in particular increased during the dormant period.