Baring, Michael Robert (2003-05). Selection of a multiple disease resistant runner-type peanut. Master's Thesis. Thesis uri icon


  • Four F2:4 populations of peanut (Arachis hypogaea L.) resulting from the complex
    cross Tamrun 96 X Tx901639-3 X Sun Oleic 95R were grown in three disease nurseries
    over a 2 year period. Three separate selection techniques were applied to determine
    which technique would provide the most effective method for selecting a multiple
    disease resistant, runner-type peanut. Technique I involved selection at a tomato spotted
    wilt virus nursery during the first cycle of selection and transferring the selections to a
    Sclerotinia minor (Jagger) nursery for a second cycle of selection in year two.
    Technique II was the reciprocal of Technique I. Technique III involved selection of the
    populations at a multiple disease nursery for two consecutive years. Selections were
    based on disease ratings, growth habits, pod and seed characteristics, and oleic/linoleic
    acid ratios. Disease ratings were scored as percentage infection on a scale of 0 (0% plot
    infected) to 10 (100% plot infected). Disease severity was also rated on a scale of 1
    (symptoms noted, but no yield effects) to 10 (plant death, no yield). There were two
    final selections for each population using each selection technique that were yield tested
    over a 2 year period to determine which technique was superior. The yield tests were
    conducted using completely randomized block design at all three disease nurseries with an additional disease-free site included. Data for disease ratings, yield, grade, and value
    per hectare were combined within locations across years. All three selection techniques
    provided lines with more disease resistance than the parents; however, there was no
    difference detected between the effectiveness of the three techniques in terms of disease
    resistance, yield, grade, or value per hectare.

publication date

  • May 2003