Resistance to the root lesion nematodes Pratylenchus thornei and P. neglectus in cereals: Improved assessments in the field

Fanning, Joshua; Linsell, Katherine Joanne; McKay, Alan; Gogel, Beverley J.; Santa, Isabel Munoz; Davey, Rowena S.; Hollaway, Grant

doi:10.1016/j.apsoil.2018.08.023

Cited by 13 publications

(4 citation statements)

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“…Previously, genetic correlation (r > 0.66) was found for data on final population densities of P. thornei between a single glasshouse experiment evaluating 47 genotypes of chickpea and six field experiments (five from the subtropical grain region and one from the warm temperate grain region of Victoria) sampled to either 15 or 30 cm soil depth evaluating a total of 85 chickpea genotypes in the one MET analysis (Rodda et al 2016). Recently, high genetic correlation (r>0.9) was found between environments for population densities of P. thornei in the top soil (0-10 cm or 0−15 cm) after harvest of 68 cereal genotypes in six field experiments in the temperate region of southern Australia, except where the fungal pathogen Rhizoctonia solani was damaging (Fanning et al 2018). In the present study with wheat, we have preferred to analyse our glasshouse data in a MET analysis separately from any field data and then to use the output of the MET analysis to predict relative P. thornei population densities in the independent field experiments.…”

Section: Discussionmentioning

confidence: 99%

“…The advantage of glasshouse methods is that the initial population density (Pi) of a single nematode species can be made constant for all genotypes to be tested in an experiment, whereas under field conditions the initial population density of the site for the target nematode species has to be determined from soil sampling (De Waele and Elsen, 2002). Spatial variability of nematode population densities in a field can be a confounding factor that may require the Pi of every plot in a field experiment to be determined (Fanning et al 2018), thereby considerably increasing the resources needed. Furthermore, better environmental control is possible under glasshouse conditions resulting in a greater proportion of experiments successfully completed with less variability between experiments.…”

Section: Introductionmentioning

confidence: 99%

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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

2020

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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 multiexperiment analysis of final population densities of P. thornei for 1,096 unique wheat genotypes in 22 glasshouse experiments. The resistance to P. thornei of 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) accounted for 79 and 11% of the genetic variance, respectively, over all experiments. Final population densities of P. thornei as empirical best linear unbiased predictors (PA[1+2]-eBLUPs) from the combined glasshouse experiments were highly predictive (P < 0.001) of final nematode population densities in the soil profile, crop canopy greenness (normalized difference vegetation index), and 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 susceptible 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 (susceptible, susceptible to very susceptible, and very susceptible). 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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Section: Discussionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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

2020

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“…As part of this program, a series of 35 field trials were conducted from 2015 to 2021 to evaluate grain production of a total of 392 common vetch lines in different growing environments across South Australia (SA), Western Australia (WA), Victoria (VIC), and New South Wales (NSW). Data from individual trials are frequently combined in what is called a multi-environment trial (MET) data set ( Patterson et al., 1977 ; Smith et al., 2001 ; Welham et al., 2010 ; Fanning et al., 2018 ; Sissons et al., 2020 ). The environments are defined as the combinations of years and locations which provide the different growing conditions associated to different meteorological and agro-ecological factors.…”

Section: Introductionmentioning

confidence: 99%

Incorporating the pedigree information in multi-environment trial analyses for improving common vetch

Munoz Santa,

Nagel,

Taylor

2023

Front. Plant Sci.

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Common vetch is one of the most profitable forage legumes due to its versatility in end-use which includes grain, hay, green manure, and silage. Furthermore, common vetch is one of the best crops to rotate with cereals as it can increase soil fertility which results in higher yield in cereal crops. The National Vetch Breeding Program located in South Australia is focused on developing new vetch varieties with higher grain and dry matter yields, better resistance to major diseases, and wider adaptability to Australian cropping environments. As part of this program, a study was conducted with 35 field trials from 2015 to 2021 in South Australia, Western Australia, Victoria, and New South Wales with the objective of determining the best parents for future crosses and the vetch lines with highest commercial value in terms of grain yield production. A total of 392 varieties were evaluated. The individual field trials were combined in a multi-environment trial data, where each trial is identified as an environment. Multiplicative mixed models were used to analyze the data and a factor analytic approach to model the genetic by environment interaction effects. The pedigree of the lines was then assembled and incorporated into the analysis. This approach allowed to partition the total effects into additive and non-additive components. The total and additive genetic effects were inspected across and within environments for broad and specific selections of the lines with the best commercial value and the best parents. Summary measures of overall performance and stability were used to aid with selection of parents. To the best of our knowledge, this is the first study which used the pedigree information to breed common vetch. In this paper, the application of this statistical methodology has been successfully implemented with the inclusion of the pedigree improving the fit of the models to the data with most of the total genetic variation explained by the additive heritable component. The results of this study have shown the importance of including the pedigree information for common vetch breeding programs and have improved the ability of breeders to select superior commercial lines and parents.

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“…Here, we define a resistant cultivar as one that can retard nematode reproduction in its roots, resulting in lower final nematode population densities than a susceptible cultivar. Resistance of cereal cultivars to P. thornei can be determined under field conditions [19] or under more controlled conditions in the glasshouse [20]. Tolerance is best determined under the field conditions of the region where the crop is grown, so that relevant environmental conditions can interact with the nematode parasite and the host cultivar to result in a relevant yield outcome [21,22].…”

Section: Introductionmentioning

confidence: 99%

Investigating the Impact of Root-Lesion Nematodes (Pratylenchus thornei) and Crown Rot (Fusarium pseudograminearum) on Diverse Cereal Cultivars in a Conservation Farming System

Thompson

Clewett

2021

Agronomy

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In two experiments on a farm practicing conservation agriculture, the grain yield of a range of wheat cultivars was significantly (p < 0.001) negatively related to the post-harvest population densities of Pratylenchus thornei in the soil profile to 45 cm depth. In a third and fourth experiment with different rotations, methyl bromide fumigation significantly (p < 0.05) decreased (a) a low initial population density of P. thornei in the soil profile to 90 cm depth and (b) a high initial population of P. thornei to 45 cm depth, and a medium level of the crown rot fungus, Fusarium pseudograminearum, at 0–15 cm depth to a low level. For a range of wheat and durum cultivars, grain yield and response to fumigation were highly significantly (p < 0.001) related to (a) the P. thornei tolerance index of the cultivars in the third experiment, and (b) to both the P. thornei tolerance index and the crown rot resistance index in the fourth experiment. In the latter, grain yield was significantly (p < 0.001) positively related to biomass at anthesis and negatively related to percentage whiteheads at grain fill growth stage. One barley cultivar was more tolerant to both diseases than the wheat and durum cultivars. Crop rotation, utilizing crop cultivars resistant and tolerant to both P. thornei and F. pseudograminearum, is key to success for conservation farming in this region.

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Resistance to the root lesion nematodes Pratylenchus thornei and P. neglectus in cereals: Improved assessments in the field

Cited by 13 publications

References 45 publications

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

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

Incorporating the pedigree information in multi-environment trial analyses for improving common vetch

Investigating the Impact of Root-Lesion Nematodes (Pratylenchus thornei) and Crown Rot (Fusarium pseudograminearum) on Diverse Cereal Cultivars in a Conservation Farming System

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