Resistance of Wheat Genotypes to Root-Lesion Nematode (Pratylenchus thornei) Can be Used to Predict Final Nematode Population Densities, Crop Greenness, and Grain Yield in the Field

Thompson, John P. and Sheedy, Jason G. ORCID: https://orcid.org/0000-0001-6569-5016 and Robinson, Neil A. (2020) Resistance of Wheat Genotypes to Root-Lesion Nematode (Pratylenchus thornei) Can be Used to Predict Final Nematode Population Densities, Crop Greenness, and Grain Yield in the Field. Phytopathology, 110 (2). pp. 505-516. ISSN 0031-949X

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Abstract

The root-lesion nematode Pratylenchus thornei is a major pathogen of wheat (Triticum aestivum) in many regions globally.. Resistance of wheat genotypes to P. thornei can be determined from final nematode population densities in glasshouse experiments, but combining results across multiple experiments presents challenges. Here we use a factor analytic method for multi-experiment analysis of final population densities of P. thornei for 1096 unique wheat genotypes in 22 glasshouse experiments. The resistance to P. thornei of 18 the genotypes was effectively represented by a two factor model with rotation of the axes to a principal components solution. Principal axes 1 and 2 (PA1 and PA2) respectively accounted for 79% and 11 % of the genetic variance over all experiments. Final population densities of P. thornei as empirical best linear unbiased predictors (PA(1+2)-eBLUPs)) from the
22 combined glasshouse experiments were highly predictive (P<0.001) of final nematode population densities in the soil profile, of crop canopy greenness (NDVI) and of grain yield of wheat genotypes in P. thornei infested fields in the Australian subtropical grain region. Nine categories of resistance ratings for wheat genotypes from resistant to very susceptible6 were based on subdivision of the range of PA(1+2)-eBLUPs for use in growers’ sowing guides. Nine genotypes were nominated as references for future resistance experiments. Most (62%) Australian wheat genotypes were in the most susceptible three categories (S, S–VS and VS). However, resistant germplasm characterized in this study could be used in plant breeding to considerably improve the overall resistance of Australian wheat crops.


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Item Type: Article (Commonwealth Reporting Category C)
Refereed: Yes
Item Status: Live Archive
Additional Information: Files associated with this item cannot be displayed due to copyright restrictions.
Faculty/School / Institute/Centre: Current - Institute for Life Sciences and the Environment - Centre for Crop Health (24 Mar 2014 -)
Faculty/School / Institute/Centre: Current - Institute for Life Sciences and the Environment - Centre for Crop Health (24 Mar 2014 -)
Date Deposited: 16 Jun 2020 04:30
Last Modified: 27 Jul 2020 00:10
Uncontrolled Keywords: root-lesion nematodes; wheat genotype resistance; MET analysis; nematode population densities predictions; wheat yield prediction
Fields of Research (2008): 07 Agricultural and Veterinary Sciences > 0703 Crop and Pasture Production > 070308 Crop and Pasture Protection (Pests, Diseases and Weeds)
Socio-Economic Objectives (2008): B Economic Development > 82 Plant Production and Plant Primary Products > 8205 Winter Grains and Oilseeds > 820507 Wheat
Funding Details:
Identification Number or DOI: https://doi.org/10.1094/PHYTO-06-0203-R
URI: http://eprints.usq.edu.au/id/eprint/37901

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