The response of selected winter wheat cultivars to artifical infection with Septoria tritici under field conditions
2001
Sip, V. | Stuchlikova, E. | Chrpova, J. (Vyzkumny Ustav Rostlinne Vyroby, Prague-Ruzyne (Czech Republic))
The response of 26 winter wheat cultivars to infection with Septoria tritici was studied in 1997-2000 field experiments at the location Prague-Ruzyne. The method of pathogen cultivation and of inoculation technique is described in detail. Septoria disease progress (SDP) and infected leaf area (ILA) were estimated on a 0-9 scale. By multiplying both parameters the coefficient of infection (CI) was calculated. To minimize the effect of experimental year micro-irrigation system was necessary. The highly virulent Czech isolate RULI was used for inoculation during the whole period. In 2000 this isolate was used in mixture with other two isolates, but this did not affect the results of cultivar evaluation. The ANOVA revealed significant cultivar and year effects. Cultivar by year interaction mean squares were of relatively lower magnitude, but statistically significant for all examined traits. Based on the analysis of multiple comparisons, the highest number of significant differences between cultivars was observed for the rate of disease spread (SDP) in plant stands. The highest resistance level showed the cultivars Arina, Hereward, Sida and Kavkaz. The Swiss cultivar Arina may be used as a source of combined resistance to the occurring pathogens causing leaf and head blights. A high resistance level was associated with later heading and greater plant height. The early and short genotypes showed on average a more rapid penetration of infection into upper parts of a plant and great variability in the examined resistance parameters, which indicates the possibility to obtain in these categories also materials with acceptable resistance level.
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