Resistance and Tolerance of Landrace Wheat in Fields Infested with Pratylenchus neglectus and P. thornei Public Deposited

http://ir.library.oregonstate.edu/concern/articles/gq67js85b

This is an author's peer-reviewed final manuscript, as accepted by the publisher. The published article is copyrighted by The American Phytopathological Society and can be found at:  http://apsjournals.apsnet.org/loi/pdis.

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  • Pratylenchus neglectus and P. thornei reduce wheat yields in the Pacific Northwest USA. Resistant landrace cultivars have been identified using controlled environments. Field resistance and tolerance characteristics were compared over three years and two locations for four spring wheat cultivars; the susceptible cultivars Alpowa and Louise, and the resistant landraces AUS28451 and Persia 20. Proportions and densities of P. neglectus and P. thornei differed across seasons and locations. Resistance was evaluated by comparing pre-plant and post-harvest densities of nematodes in soil. Tolerance was evaluated by comparing grain yield and grain quality in plots treated or untreated by the nematicide aldicarb. Alpowa was susceptible and intolerant, Louise was susceptible and moderately tolerant, AUS28451 was resistant and intolerant, and Persia 20 was moderately susceptible and moderately intolerant. The species dominance shifted from P. neglectus to P. thornei in one field over a period of three years in apparent response to cultivars and crops planted. Estimates of economic loss caused by Pratylenchus spp. ranged from $8 to $20/ha. Economic benefits appear to be achievable by developing a spring wheat genotype with tolerance plus resistance, such as with a cross between AUS28451 and Louise.
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  • Smiley, R. W., Gourlie, J. A., Yan, G., & Rhinhart, K. E. (2014). Resistance and tolerance of landrace wheat in fields infested with Pratylenchus neglectus and P. thornei. Plant Disease, 98(6), 797-805. doi:10.1094/PDIS-10-13-1069-RE
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