Abstract
AbstractRamularia leaf spot disease (RLS) is one of the most dominating fungal diseases in barley. The disease typically appears late in the season after flowering and results in a rapid loss of photosynthetic leaf area. A recent decline in fungicide efficacy and a lack of RLS-resistant cultivars hamper effective control. Global warming will provoke increasing droughts which influence host plant physiology and probably affect outbreak and severity of RLS. Relatively little is known about genetic resistance to RLS in winter barley and about the influence of various weather conditions and climate change on RLS pathogenesis. Hence, we evaluated severity of RLS on 15 winter barley genotypes under persistent late-terminal drought stress or controlled irrigation, respectively, in a field rainout shelter. Over three consecutive years, we observed reproducible differences in quantitative RLS field resistance of the used cultivars and variable suppression of RLS under drought. Our results support a function of drought in suppression of RLS in winter barley, but also reveal strong year effects even under semi-controlled rainout shelter conditions. Data may be relevant for genotype selection in breeding programmes for RLS resistance and for farmers in the frame of integrated disease management under a changing climate.
Graphical abstract
Funder
Bavarian State Ministry of the Environment and Consumer Protection
Technische Universität München
Publisher
Springer Science and Business Media LLC
Subject
Horticulture,Plant Science,Agronomy and Crop Science
Reference57 articles.
1. Anderson PK, Cunningham AA, Patel NG, Morales FJ, Epstein PR, Daszak P (2004) Emerging infectious diseases of plants: pathogen pollution, climate change and agrotechnology drivers. Trends Ecol Evol 19(10):535–544. https://doi.org/10.1016/j.tree.2004.07.021
2. Assinger T, Torriani SFF, Accardo S, Fountaine J, Steinkellner S (2021) Fungicide strategies and resistance of Ramularia collo-cygni to demethylation and succinate dehydrogenase inhibitors in Austrian winter barley (Hordeum vulgare). J Plant Dis Prot 128(3):735–748. https://doi.org/10.1007/s41348-021-00454-x
3. Assinger T, Fountaine J, Torriani S, Accardo S, Bernhard-Frey R, Gottula J, Steinkellner S (2022) Detection of Ramularia collo-cygni DMI- and SDHI-resistant field populations in Austria and the effect of fungicides on the population and genetic diversity. Eur J Plant Pathol 162(3):575–594. https://doi.org/10.1007/s10658-021-02422-5
4. Brown JK, Havis ND, Fountaine JM, McGrann GR, Corbitt MM, Kaczmarek M, et al (2014) Control of Ramularia leaf spot in a changing climate. Project Report No. 553, pp. 1–26. online available at https://projectblue.blob.core.windows.net/media/Default/Research%20Papers/Cereals%20and%20Oilseed/rd-2007-3441-final-1.pdf
5. Chakraborty S, von Tiedemann A, Teng PS (2000) Climate change: potential impact on plant diseases. Environ Pollut 108(3):317–326. https://doi.org/10.1016/s0269-7491(99)00210-9