|Brown, Charles - Chuck|
Submitted to: Potato Association of America Proceedings
Publication Type: Abstract Only
Publication Acceptance Date: 4/15/2000
Publication Date: 12/15/2000
Citation: GUNDERSEN, B., INGLIS, D., PORTER, L., MILLER, J., JOHNSON, D., BROWN, C.R. COMPREHENSIVE LABORATORY AND FIELD ASSESSMENT OF RESISTANCE TO PHYTOPHTHORAINFESTANS DERIVED FROM SOLANUM HOUGASII IN A SEGREGATING BREEDING POPULATION. POTATO ASSOCIATION OF AMERICA PROCEEDINGS. VOL 77:399. 2000.
Technical Abstract: Significant losses to the U.S. potato industry due to late blight have placed a new demand on potato breeding programs to develop cultivars with durable resistance. A mapping population was established with 1) an accession of S. hougasii from Mexico and 2) corky ringspot resistant parental lines, and tested against US-8 and US-11 genotypes of P. infestans. Foliar disease reactions of 75 progeny were compared in natura field epidemics in Mount Vernon. Area under disease progress curve (AUDPC) values for control plants (cv Russet Burbank) were 4909 and 2538, but values for progeny ranged from 234 to 5650 and 349 to 2967, during 1998 and 1999, respectively. Moreover, 10 and 12 percent (pct) of the progeny were rated as highly resistant, and 40 and 39 pct were rated as highly susceptible, over the two respective years. Tuber reactions in laboratory assays in Pullman ranged from 0 to 68 pct internal blight; the control (cv Ranger Russet) had 72 pct internal blight. Foliar and tuber resistance were not highly correlated (r=0.52, 0.27) either year when analyzed by population, although some individual lines exhibited resistance in both the foliage and tubers. Foliar resistance in the field was characterized by leaf chlorosis, limited lesion expansion, and few sporangia per lesion.