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WP 4 Field experiments with artificial Fusarium inoculation

Explore methods & traits for screening genetic resources against Fusarium species. Discuss experimental parameters & evaluation criteria in varying climates. Inoculation, harvest methods, and evaluation traits detailed.

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WP 4 Field experiments with artificial Fusarium inoculation

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  1. AVEQ meeting CF 18.09.07 WP 4 Field experiments with artificial Fusarium inoculation Introduction Fixed conditions Methods and traits for discussion Details of methods

  2. AVEQ meeting CF 18.09.07 Salmon pink discoloration of husk und kernels after inoculation with F. culmorum

  3. AVEQ meeting CF 18.09.07 Field experiments with artificial Fusarium inoculation Aim Evaluation/screening of genetic ressources for resistance to Fusarium ssp. and/or mycotoxin accumulation These traits are quantitativ inherited and influenced by environment and other traits as plant height, lodging, panicle length, hull content etc.

  4. AVEQ meeting CF 18.09.07 WP4 Partners FCBR ARIK Sucajeva FIOR

  5. AVEQ meeting CF 18.09.07 WP4 Field experiments with artificial Fusarium inoculation Fixed conditions • 300 Accessions/a. • 10 standard cultivars, replicated 5 fold, (augmented design)

  6. AVEQ meeting CF 18.09.07 Methods and traits need to be discussed • - Design and number of replications and • Plot size (2 m2 or less) • - Inoculation method • - Fusarium ssp. for inoculation • - Method of harvesting and sample preparation

  7. AVEQ meeting CF 18.09.07 • heading date, • panicle density per m2, • crop height, • distance between panicle and flag leaf • panicle shape, • panicle length, • infection of panicles with Fusarium • lodging at harvest • thousand kernel weight (TGW), • test weight • Fusarium-infection of seeds • hull content (HUC) Traits of evaluation, need to be discussed (Leaf index and number of kernel per spikelet were deleted)

  8. AVEQ meeting CF 18.09.07 Details of methods Design, plot size and number of replications Augmented design or randomised block design ? • Augmented design at four climatically different locations (Germany, Czech Republik, Romania, Italy) • Comparisons with standard cv.s should give a good evaluation at least susceptibility in accessions tested. • Number of plots manageable and lower border effects in comparison with smaller plots in a randomised design. • Accessions grouped for crop height and heading date

  9. AVEQ meeting CF 18.09.07 Details of methods Inoculation method • Replicated Spraying of spore suspension over the plotswith a portable sprayer(during or after flowering, 105-106 spores per ml + 0.1ml/l Tween 20; 50ml/m2 , at 7 p.m., high air humidity, low wind) • alternatively/additionally: Scattering infected seeds (6g/m2, before heading) within the plots(more natural) • After inoculation and dry weather conditions: Irrigation, if available

  10. AVEQ meeting CF 18.09.07 Details of methods Inoculum: Mycotoxin profile dependent from the Fusarium strain and Fusarium species (no correlation to aggressiveness), high variability within and between species Tab. 1 according to Langseth et al. (1999)

  11. AVEQ meeting CF 18.09.07 Details of methods • Low host specialisation in F. graminearum, F. culmorum and F. avenaceum • Adaptation of Fusarium ssp. to local climatic conditions and different aggressiveness. Consequence for screening in WP4: Usage of local defined mixtures of mycotoxin producing strains of F. graminearum, F. culmorum, F. sporotricioides and F. avenaceum for inoculation disadvantage: competition between Fusarium strains results in reduced aggressiveness and lower mycotoxin accumulation (Midaner et al. 2004)

  12. AVEQ meeting CF 18.09.07 Details of methods • heading date = day in June or July • leaf index ?? • panicle density per m2, counting 1 m of two rows, appropriate germination presumed • crop height in cm (after flowering but before lodging) Average height of the plants from ground to top of panicle, excluding awns. • panicle length in cm Traits of evaluation, need to be discussed and fixed

  13. AVEQ meeting CF 18.09.07 Details of methods • Infection of panicles with Fusarium: • Usually there is low or no visual scab, but it have to be checked.1=no infection ... 9=all spikelets and panicles are infected • Lodging prior harvest: 1=no lodging…9= 100%lodging • Number of kernels per spikelet ??? • Thousand kernel weight (TGW) (might be reduced due to Fusarium infection) 3 x 100 unsorted kernel • Test weight in grams per hectoliter

  14. AVEQ meeting CF 18.09.07 Details of methods • Percent Fusarium infected kernels by sorting 3 x 100 kernels (from TKW-measurement) • Three classes: • sound • suspicious infected, grey tips • FDK= Fusarium damaged kernels, discoloured, smaller,

  15. AVEQ meeting CF 18.09.07 Details of methods influence on the assessment of Fusarium infection of seeds: Color of the lemma as in BSA/IBPGR

  16. AVEQ meeting CF 18.09.07 Details of methods • influence on the assessment of Fusarium infection of seeds: • Color of the lemma as in BSA/IBPGR • hull content (HUC): • Weigh out 100g seeds of equal moisture content, • air-pressure dehuller, 8 at, 4 min, • note the weight of kernels and hulls; • score of undehulled kernels • Additionally: score of proportion of discoloured groats

  17. AVEQ meeting CF 18.09.07 Details of methods Method of harvesting and sample preparation: Harvest with plot combine harvester with reduced air cleaning to prevent reduction of Fusarium damaged kernels (FDK)

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