Submitted to: Phytopathology
Publication Type: Abstract Only
Publication Acceptance Date: April 13, 2011
Publication Date: June 1, 2011
Citation: Wechter, W.P., Keinath, A.P., Smith, P., Farnham, M.W. 2011. Field evaluation of leaf blight-resistant plant introductions of Brassica Juncea and Brassica Rapa and elucidation of inheritance of resistance. Phytopathology. 101:S189. Technical Abstract: Brassica leafy greens (Brassica juncea and Brassica rapa) represent one of the most economically important vegetable crop groups in the southeastern United States. In the last 10 years, numerous occurrences of a leaf blight disease on these leafy vegetables have been reported in several states. One of the pathogens responsible for this blight is Pseudomonas cannabina pv. alisalensis (Pca). Two B. rapa (G30710 and G30499) and two B. juncea (PI418956 and G30988) plant introductions (PI) with moderate to high levels of resistance to this pathogen in greenhouse studies were tested for field resistance in comparison to eight commercial cultivars of B. rapa, B. juncea and B. oleracea, which include turnip greens, mustard greens, collard and kale. The two B. juncea PI and one of the B. rapa PI (G30499) were found to have significantly less disease than all tested cultivars except Southern Curled Giant mustard (B. juncea) and Blue Knight kale (B. oleracea). Inheritance of resistance studies performed with populations derived from the resistant G30988 and two susceptible, rapid-cycling PI indicate that the resistance is probably multigenic.