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Cultivar Effects on the Expression of Induced Resistance in Spring Barley
Dale R Walters1, Neil D Havis1, Linda Paterson1
1Crop and Soil Systems Research Group, Scottish Agricultural College, West Mains Road, Edinburgh EH9 3JG, UK.
Plant Disease
|February 9, 2019
Summary
Host plant genetics significantly impact how well spring barley (Hordeum vulgare) responds to induced resistance treatments against common diseases. This variability affects disease control and sometimes grain yield across different barley cultivars.
Area of Science:
- Plant Pathology
- Agronomy
- Molecular Biology
Background:
- Host genotype plays a crucial role in plant defense mechanisms.
- Induced resistance is a plant defense strategy that can be activated by specific compounds.
- Spring barley (Hordeum vulgare) is susceptible to major pathogens like Rhynchosporium secalis and Blumeria graminis f. sp. hordei.
Purpose of the Study:
- To investigate the influence of host genotype on induced resistance expression in spring barley.
- To evaluate the efficacy of an elicitor combination (acibenzolar-S-methyl, β-aminobutyric acid, cis-jasmone) in controlling barley diseases.
- To assess the impact of induced resistance on grain yield and defense enzyme activity.
Main Methods:
- Tested seven spring barley cultivars with varying genetic resistance.
- Applied a combination of three elicitors to induce resistance.
- Conducted controlled-environment and multi-year field experiments.
- Measured disease severity, grain yield, and cinnamyl alcohol dehydrogenase activity.
Main Results:
- Elicitor treatment reduced Rhynchosporium secalis levels in most cultivars, but the magnitude of reduction varied significantly among genotypes.
- Disease control efficacy showed year-to-year inconsistency in field trials.
- Grain yield was generally unaffected, with significant increases observed in only a few specific cultivar-year combinations.
- Cinnamyl alcohol dehydrogenase activity was high pre-treatment in some cases, suggesting potential prior induction.
Conclusions:
- Host genotype is a critical factor determining the effectiveness of induced resistance in spring barley.
- The variable response highlights the need for genotype-specific strategies for elicitor application.
- Further research is needed to understand the role of pre-existing induction levels in elicitor efficacy.
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