Genetic variation and associations involving Fusarium head blight and deoxynivalenol accumulation in cultivated oat (Avena sativa L.)

acceptedVersio

Resistance to Fusarium infection in oats ( Avena sativa L.)

This paper summarizes the impact of Fusarium in oats, with a special emphasis on resistance to infection. Oats are generally the less susceptible than the other small-grained cereals, possibly due to the panicle structure leading to single spikelet infections, but the levels of mycotoxins (most commonly DON) are more severe in oats.. A number of species infect oats and the species F. langsethii appears common in Scandinavia and produces T2+HT-2 toxins. Dehulling may generally remove the toxins, but the yield impact is unknown. In field infections early decay of kernels may frequently be observed. The infection time appears wider than in wheat or barley. Genetic variation exists in the cultivated germplasm, if a wide range is tested, and very susceptible cultivars may be identified. Apparent resistance has been detected in derivatives from Avena sterilis , and its genetics is being investigated

Estimating Deoxynivalenol Content of Ground Oats Using VIS-NIR Spectroscopy

The potential of VIS-NIR spectroscopy as a rapid screening method for resistance of Fusarium-inoculated oats to replace the costly chemical measurements of deoxynivalenol (DON) was investigated. Partial least squares (PLS) regression was conducted on second-derivative spectra (400–2,350 nm) of 166 DON-contaminated samples (0.05–28.1 ppm, mean = 13.06 ppm) with separate calibration and test set samples. The calibration set had 111 samples, and the test set had 55 samples. The best model developed had three PLS components and a root mean square error of prediction (RMSEP) of 3.16 ppm. The residual predictive deviation (RPD) value of the prediction model was 2.63, an acceptable value for the purpose of rough screening. Visual inspection and the VIS spectra of the samples revealed that high-DON samples tended to be darker in color and coarser in texture compared with low-DON samples. The second-derivative spectra showed that low-DON samples tended to have more water and fat content than high-DON samples. With an RMSEP value of 3.16 and RPD of value of 2.63, it seems possible to use VIS-NIR spectroscopy to semiquantitatively estimate DON content of oats and discard the worst genotypes during the early stages of screening.submittedVersio

Screening of oat accessions for Fusarium head blight resistance using spawn-inoculated field experiments

publishedVersio

Associations between anther extrusion and Fusarium Head Blight in European wheat

Until now, testing for resistance to FHB in cereals has been expensive and affected by differences in environmental conditions. Rapid screening methods are needed. Recently it was discovered that in wheat good extrusion of anthers (AE) is associated with high resistance to FHB. In one genetic study a fan-shaped pattern was found: The variation and level of FHB/DON was reduced when AE increased. In order to verify these results, 69 varieties of winter wheat from Germany and Scandinavia and 136 varieties of spring wheat from GRAMINOR breeding in Norway were tested for AE and resistance to FHB and DON. The fan-shaped distribution was found also here. Accordingly, AE is recommended as a new and inexpensive screening method for low FHB. When sufficient moisture is available in the period before flowering and wind do not remove anthers, field selection for AE could be made, in other cases greenhouse selection is recommended

Anther extrusion and plant height are associated with Type I resistance to Fusarium head blight in bread wheat line ‘Shanghai-3/Catbird’

acceptedVersio

Genetic variation and associations involving Fusarium head blight and deoxynivalenol accumulation in cultivated oat (Avena sativa L.)

acceptedVersio