Quantification of in planta Zymoseptoria tritici progression through different infection phases and related association with components of aggressiveness

Phytopathology
Atikur RahmanEwen Mullins

Abstract

In planta growth of Zymoseptoria tritici, causal agent of Septoria tritici blotch (STB) of wheat, during the infection process has remained an understudied topic due to the long symptomless latent period before the emergence of fruiting bodies. In this study, we attempted to understand the relationship between in planta growth of Z. tritici relative to the primary components of aggressiveness, i.e., latent period and pycnidia coverage in regards to contrasting host resistance. We tested isolates collected from Ireland against the susceptible cv. Gallant and the highly resistant cv. Stigg. A clear isolate-host interaction effect (F=3.018; P=0.005 and F=6.008; P<0.001) for latent period and pycnidia coverage respectively, was identified. Furthermore, during the early infection phase of latency from 5 to 11 dpi, in planta growth rate of fungal biomass was significantly (F=30.06; P<0.001) more affected by host resistance than the isolate specificity (F=1.27; P=0.27), indicating the importance of host resistance in early infection phase. In planta Z. tritici growth rates in cv. Gallant spiked between 11 and 16 dpi followed by a continuous fall onward whereas, in cv. Stigg it was slowly progressive in nature. From correlation and reg...Continue Reading

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