Submitted to: Phytopathology
Publication Type: Abstract Only
Publication Acceptance Date: January 1, 2003
Publication Date: June 1, 2003
Citation: GRUNWALD, N.J., COFFMAN, V.A., KRAFT, J.M. SOURCES OF RESISTANCE TO FUSARIUM ROOT ROT. PHYTOPATHOLOGY. 2003. 93:S30. Technical Abstract: Fusarium root rot, caused by <i>Fusarium solani</i> f. sp. <i>pisi</i>, is one of the most important fungal diseases of pea (<i>Pisum sativum</i>) and is found in most pea growing areas around the world. Currently, no commercial cultivars are resistant to this pathogen. Availability of new sources of partial resistance could provide another tool for managing Fusarium root rot. Three hundred eighty-seven accessions from the <i>Pisum</i> core collection were evaluated for resistance to Fusarium root rot in two independent experiments. Nonparametric analysis of variance conducted on ranks of disease severity for each accession indicated that the two experiments corresponded well. Forty-four PI lines with a disease severity rating of 2.5 or less on a 0 to 5 scale were selected as serving as good sources of partial resistance. Resistance was quantitative in nature and immunity to Fusarium root rot was not found. Comparison of disease resistance data for Aphanomyces root rot and Fusarium root rot showed a weak, but significant and positive correlation. The 44 PI lines selected are currently being evaluated in field trials to validate results from this study.