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United States Department of Agriculture

Agricultural Research Service

Title: Identification and Characterization of Partial Resistance to Fusarium root rot in the Pisum Core Collection

Authors
item Porter, Lyndon
item Coffman, Virginia

Submitted to: European Conference on Grain Legumes Proceedings
Publication Type: Abstract Only
Publication Acceptance Date: October 7, 2007
Publication Date: November 12, 2007
Citation: Porter, L., Coffman, V.A. 2007. Identification and Characterization of Partial Resistance to Fusarium root rot in the Pisum Core Collection. Integrating legume biology for sustainable agriculture, Book of Abstracts, 6th European Grain Legume Conference, 12-16 November 2007, Lisbon Congress Centre, Portugal p. 158.

Technical Abstract: Fusarium solani f. sp. pisi (Fsp) is a serious seed and root rot pathogen found in both dryland and irrigated peas in the USA. Resistance to Fsp in 44 wild pea accessions from the Pisum Core Collection located in Pullman, WA, USA was characterized under greenhouse conditions. Germination rates, root disease severity, plant height, foliage fresh weight, foliage dry weight, and root dry weight of inoculated and non-inoculated plants of each accession were compared. Percent germination of inoculated and non-inoculated seed of all 44 accessions screened were not significantly (P > 0.05) different in two or more trials, indicating a high level of resistance in the accessions to seed rot and pre-emergence damping off due to Fsp. Eight accessions (PI125839, PI184128, PI198735, PI220174, PI 220189, PI 222071, PI222117 and 271119) were identified as being highly resistant (RDI values between 0.92 and 2.32) to Fsp based on root disease severity (RDI) values. Eight accessions (PI25839, PI125840, PI175226, PI220174, PI2223526, PI2223527, PI226561 and PI227258) also demonstrated high resistance to Fsp since mean plant heights, foliage fresh weights, foliage dry weights, and root dry weights of these accessions were not significantly (P > 0.05) different from non-inoculated plants of these same accessions in replicated trials. A high frequency of Fsp-resistant wild germplasm originating from Afghanistan may indicate a potential unique source of genetic resistance to Fsp specific to germplasm from that country.

Last Modified: 9/10/2014
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