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  • Standardization of the tyrosinase test for identification of wheat varieties

    Creator:
    Matos, Marlene de
    Abstract:
    This study was undertaken to standardize and evaluate the tyrosinase test as a variety identification procedure for wheat. The potential value of the tyrosinase test lies in its ability to quantify the colored products, rather than relying on visual estimation as in the phenol test. The specific objectives of this...
    Resource Type:
    Masters Thesis
    Full Text:
    - tive measurement may also be useful in describing varieties being entered under the Plant Variety

  • Identification of species and varieties of ryegrass (Lolium spp.)

    Creator:
    De Barros, Manoel Bernardo
    Abstract:
    The objective of this study was to investigate ryegrass seedling characteristics that, by themselves, or combined with presently known characters, could improve varietal identification tests. Thirteen characters were studied on 30 varieties of Lolium multiflorum Lam., L. perenne L., L. rigidum Gaud, and L. hybridum Hausskn., including leaf size and...
    Resource Type:
    Masters Thesis
    Full Text:
    . Some significant differences among varieties within species and ploidy levels were observed in the

  • Laboratory methods for wheat variety identification

    Creator:
    Ait Amer Meziane, Aomar
    Abstract:
    There is an increasing need for development of laboratory identification procedures for purposes of plant variety protection, seed certification, quality control and consumer protection. In the past there were fewer commercial varieties and field testing methods based on morphological differences were used satisfactorily. These tests require several months to complete...
    Resource Type:
    Masters Thesis
    Full Text:
    consumer protec- tion. In the past there were fewer commercial varieties and field testing methods based

  • Effect of variety, planting date and plant population on yield and quality of Snap Bean (Phaseolus vulgaris L.) seed

    Creator:
    Filgueiras, Tarciso de Sousa
    Abstract:
    The objectives of these experiments were to determine the feasibility of saving seed from snap bean fields in the Willamette Valley that have been bypassed for canning and freezing, and to study the effects of different seed production methods on yield and quality of snap bean (Phaseolus vulgaris L.). Field...
    Resource Type:
    Masters Thesis
    Full Text:
    Research Farm in 1975 27 3 Seed yield and quality factors of two snap bean varieties in 1975 as affected

  • Temperature preconditioning of ryegrass (Lolium sp.) seed dormancy

    Creator:
    Wiesner, Loren E.
    Abstract:
    The purposes of this study were to determine the effects of temperature, nutrients, growth regulators, and culm detachment during seed development on ryegrass seed dormancy and weight. The effects of storage temperature on seed dormancy were also studied. Seed dormancy of annual (Lolium multiflorum Lam.) and perennial (Lolium perenne L.)...
    Resource Type:
    Dissertation
    Full Text:
    Annual and perennial ryegrass varieties were evaluated for seed dormancy characteristics in 1969 and

  • Grass seed quality in relation to time of windrowing

    Creator:
    Dübbern de Souza, Francisco Humberto
    Abstract:
    This study was undertaken to obtain information on the quality of grass seed when windrowed at the high moisture levels necessary for obtaining maximum yields. A secondary goal was to monitor moisture and temperature fluctuations in the windrow and to relate their effects to development and deterioration of the seed....
    Resource Type:
    Masters Thesis
    Full Text:
    grasses were included in the study: tall fescue (Festuca arundinacea Schreb.) variety "Fawn", orchard

  • Endosperm morphogenesis in wheat (Triticum aestivum L.)

    Creator:
    Huber, Andrew Gail, 1944-
    Abstract:
    Wheat endosperm morphogenesis was studied by light microscopy during the entire growth period of anthesis to maturity. Four developmental stages have been described in this thesis: (1) double fertilization, (2) formation of the lower endosperm cells, (3) termination of nuclear divisions, and (4) initiation of protein bodies. The first manuscript...
    Resource Type:
    Dissertation
    Full Text:
    Endosperm morphogenesis in wheat (Triticum aestivum L

  • Seed maturation in subterranean clover (Trifolium subterraneum L.)

    Creator:
    Mouwen, Charles M.
    Abstract:
    A seed maturation study was conducted to determine the earliest date seed of subterranean clover (Trifolium subterraneum L.) may be safely harvested without reduction in yield or seed quality. In 1981 and 1982, seed and bur weight, seed and bur moisture content, germination and seedling vigor were studied to determine...
    Resource Type:
    Masters Thesis
    Full Text:
    mature in 'Mt. Barker' and 'Nangeela' subclover. Indirect maturity indices were evaluated for use in

  • Plant and seed development in four Cuphea species

    Creator:
    Kaliangile, Imanga
    Resource Type:
    Masters Thesis
    Full Text:
    varieties of C. ignea and C. llavea are popular ornamentals in warm areas of the U.S.A. (Miller et al

  • Utilization of the night-interruption phenomenon to hasten the seed increase of long-day cereals during short-day regimes in California and Arizona

    Creator:
    Ebeltoft, David C.
    Abstract:
    Tests were carried on in growth chambers and in the field to determine if the harvest of daylength-sensitive long-day cereals grown during the winter in Arizona could be hastened 30 days by the use of night interruption. Two durum lines which were near-isogenic for sensitivity to daylength were used throughout...
    Resource Type:
    Dissertation
    Full Text:
    varieties as rapidly as possible. This policy is now of particular importance in view of the low