|Dorrance, A - WSU-REU, MT.VERNON, WA|
|Inglis, D - WSU-REU, MT. VERNON, WA|
Submitted to: Meeting Abstract
Publication Type: Abstract Only
Publication Acceptance Date: July 25, 1997
Publication Date: N/A
Technical Abstract: Four Solanum populations, two consisting of BC1 derived froma a somatic hybrid of S. bulbocastanum and 2 from crosses with multiple disease resistant parent (AWN86514), were evaluated in the field near Mt. Vernon for resistance to Phytophthora infestans (US11). Thirty clones each were replicated in three randomized complete blocks. Data were collected to estimate area under the disease progress curve (AUDPC), days to 5% disease threshold (DT), and sporangia production (SP). There were significant differences within each population for all three parameters. Regression analysis indicated that the DT was highly correlated (P=.0001) with AUDPC for all populations. In contrast SP was highly correlated (P=.0001) with AUDPC in two populations, correlated (P=.01) in one, but not the other population. This confirms previous reports that the contribution of individual components of partial resistance to late blight may be different in distinct Solanum populations, and that modulation of DT and SP function separately in these new populations.