Search Constraints

Start Over
Filtering by: Creator Armstrong, Donald Remove constraint Creator: Armstrong, Donald Subject Cytokinins Remove constraint Subject: Cytokinins

Search Results

  • [8-¹⁴C]zeatin metabolism in Phaseolus embryos

    Creator:
    Lee, Yun-hwa
    Resource Type:
    Masters Thesis
    Full Text:
    graduate studies. I grateful ly acknowledge the assistance of Mr. Donald A. Griffin for the analysis of

  • Cytokinin antagonists and antibiotics related to nalidixic acid : effects on Phaseolus and Nicotiana callus tissues

    Creator:
    Marsden, Katherine E.
    Abstract:
    The effects of five cytokinin antagonists on the growth of cytokinin-autonomous lines of Phaseolus lunatus cv. Kingston, Phaseolus vulgaris cv. Great Northern, and Nicotiana tabacum cv. Wisconsin 38 callus tissues have been compared. The antagonists tested included four N⁴-substituted 4-amino-2-methylthiopyrrolo[2,3-d]pyrimidines bearing the following N⁴ side chains, 4-n-pentyl- (ms²pnN⁴Prp), 4-n-hexyl- (ms²HxN⁴Prp),...
    Resource Type:
    Masters Thesis
    Full Text:
    . Donald J. Armstrong for his help and guidance during my graduate study. His encouragement, patience, and

  • Cytokinin oxidase activity from Phaseolus vulgaris L. cv. Great Northern callus tissues

    Creator:
    Chatfield, J. Mark
    Abstract:
    Cytokinin oxidase activity in callus tissues of Phaseolus vulgaris L. cv. Great Northern has been examined using an assay based on the oxidation of radioactively labeled N⁶ -(Δ² -isopentenyl) adenine (i⁶Ade) to adenine (Ade). Conditions for the quantitative extraction and assay of the enzyme have been established. The substrate specificity...
    Resource Type:
    Dissertation
    Full Text:
    Privacy Donald J. Armstrong Cytokinin oxidase activity in callus tissues of Phaseolus vulgaris L. cv

  • Interaction of cytokinins and phenethylamines in cell-free enzyme systems and plant callus cultures

    Creator:
    Abdelnour-Esquivel, Ana
    Abstract:
    1-Phenyl-3-(2-Thiazoly1)-2-Thiourea (PTTU), has been reported to inhibit dopamine-fi-hydroxylase (a copper-containing enzyme involved in the pathway of biosynthesis of adrenaline in animal systems). In the present study, PTTU has been shown to have cytokinin activity in the tobacco bioassay. The cytokinin activity of PTTU suggested that cytokinin-active N⁶-substituted adenine derivatives might...
    Resource Type:
    Masters Thesis
    Full Text:
    . Abstract approved: Redacted for privacy Donald J. Armstrong 1-Phenyl-3-(2-Thiazoly1)-2-Thiourea (PTTU

  • Auxin and cytokinin interaction in tomato (Lycopersicon esculentum Mill.)

    Creator:
    Coenen, Catharina
    Abstract:
    The phytohormones auxin and cytokinin control plant development through a complex network of interactions which include synergistic, additive, and opposite effects whose mechanisms are unknown. The auxin-insensitive diageotropica (dgt) mutant provided a tool to dissect the relationship between auxin- and cytokinin-induced responses in tomato. Morphological, physiological, and molecular data support...
    Resource Type:
    Dissertation
    Full Text:
    abilities. I thank the members of my committee, Carol Rivin, Don Armstrong, Machteld Mok, Paul Farber, and