Inheritance of resistance to Sclerotinia minor in Selected Arachis hypogaea L. Varieties. (4707)
Authors:
A. Maas* - Oklahoma State University
K. Dashiell - Oklahoma State University, Stillwater, OK H. Melouk - USDA ARS, Stillwater, OK
Abstract:
The fugal disease Scleotinia minor Jagger has become one of the major limiting factors of peanut (Arachis hypogaea L.)production in all peanut producing regions of the United States. Yield losses of 10% are typical; however in cases of severe infection losses of up to 50% are not uncommon. Host plant resistance is viewed as the most effective solution, however inheritance is not clearly understood, with multiple mechanisms controlling resistance. These mechanisms include avoidance of disease due to architecture, maturity, and/or physiological mechanisms of unknown form. This research utilized detached stem inoculation to study the
inheritance involved in the physiological form of resistance. Diallelic crosses were made between two resistant lines Southwest Runner and Tamspan 90 and two susceptible lines Okrun and Flavor Runner 458. 150 F1 plants were obtained with an average of 12 plants per cross yielding 2535 F2 seeds. An average of 80 2 seeds were tested per cross. High variances produced by this method of testing provided inconclusive results of heritability, however detached stem studies may provide a means of determining form of resistance for parental selection.
Speaker Information: Andrea Maas, Oklahoma State University, 368 Agriculture Hall, Stillwater, OK 74078; Phone: 405-744-7903; E-mail: [email protected]
Session Information: Wednesday, November 3, 2004, 4:00 PM-6:00 PM Presentation Start: 4:00 PM (Poster Board Number: 1235)
