Thesis (Ph. D.)--University of Wisconsin--Madison, 1938. / Typescript. Includes abstract and vita. eContent provider-neutral record in process. Description based on print version record. Includes bibliographical references (leaves 73-74).

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Sweet clover plants become more susceptible to low temperatures as they advance in age. They are most resistant when in the crook stage. Plants resulting from unhulled seed are more vigorous and resistant to low temperatures than are plants resulting from scarified seed. Plants from unhulled seed produce larger bay yields and more profits than do similar plants resulting from scarified seed. Soils containing a medium percentage of moisture afford more optimum conditions for plant growth than do soils of extremely low or high moisture content. There is an indication, but not conclusive, that the physiological activity of seedlings from scarified seed is slightly more rapid than is the ease of imhulled seedlings. Alternate freezing and thawing of impermeable sweet clover seed, or treating with concentrated sulphuric acid, does not increase, to any significant degree, the percentage of germination. It seems that the subjection of seed to a moist condition is just as effective as any attempt to increase germination by artificial means. / M.S.

LD2668 .T4 1948 D36 / Master of Science

A series of experiments was completed in which the morphology, anatomy and biochemistry of two Melilotus species, Melilotus alba and Melilotus officinalis, were studied. The purposes of the study were to illustrate whether the variability of specimens was due to polymorphism or speciation and to isolate the factors that have separated these specimens as competitors.The effects of impaction and scarification on the germination of M. alba and M. officinalis seeds were studied, as were the effects of light and temperature stimuli on germination and growth The rate of plant maturation and the chronology of flowering for the two species were investigated. Maturation differences were minor, but the chronologies of flowering deviated markedly.The techniques of one- and two-directional thin layer chromatography were used to separate the free amino acids in Melilotus seed extract preparations. The technique of polyacrylamide gel electrophoresis was used to separate the proteins in these preparations. In every experiment, the two Melilotus "species" were genus specific with no species variables in terms of the amino acid and protein complements.

Thesis (Ph. D.)--University of Wisconsin--Madison, 1950. / Typescript. Vita. eContent provider-neutral record in process. Description based on print version record. Includes bibliographical references (leaves 52-54).

Thesis (Ph. D.)--University of Wisconsin--Madison, 1958. / Typescript. Abstracted in Dissertation abstracts, v. 19 (1958) no. 4, p. 648-649. Vita. eContent provider-neutral record in process. Description based on print version record. Includes bibliographical references (leaves 37-40).

Unhulled white sweet clover seeds return larger yields of bay and greater profits than do similar scarified seeds. Seedlings resulting from unhulled seeds are more resistant to low temperatures than seedlings coming from scarified seeds. Sweet clover seedlings are most resistant to cold when in very early stages of development. They become more susceptible with advance in age. High soil moisture exerts a protective influence on seedlings which are in a susceptible stage of growth at the time of exposure to low temperatures. There is some evidence, although not conclusive, that seedlings coming from scarified seeds are more active physiologically than those coming from unhulled seeds. / M.S.