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Published on: February 25, 2021
Salinity-mediated cyanogenesis in white clover (Trifolium repens) affects trophic interactions
Daniel J Ballhorn1, Jacob D Elias2
1Portland State University, Department of Biology, 1719 SW 10th Avenue, Portland, OR 97201, USA ballhorn@pdx.edu.
Soil salinity increases cyanogenesis in white clover, enhancing its defense against herbivores. This salt-induced change in plant compounds may impact livestock grazing, requiring further study.
Area of Science:
- Plant science
- Agro-ecosystems
- Plant metabolism
Background:
- Soil salinity is a growing global stressor in agriculture.
- Limited understanding of salinity's impact on crop secondary metabolism.
- Salt-induced changes in plant defenses can affect food quality and pest resistance.
Purpose of the Study:
- To investigate the quantitative effects of soil salinity on cyanogenesis in white clover (Trifolium repens).
- To assess how salinity influences defense-associated compounds and herbivore interactions.
Main Methods:
- Experimental white clover plants were subjected to five salinity levels.
- Quantified cyanogenic potential (HCNp), β-glucosidase activity, soluble protein, and biomass.
- Assessed herbivore (slug and weevil) feeding trials to test plant attractiveness.
Main Results:
- Salt treatment significantly upregulated cyanogenic potential (HCNp) in white clover.
- No significant changes observed in β-glucosidase activity or soluble protein concentration.
- Increased HCNp negatively correlated with leaf area consumption by both generalist and specialist herbivores.
Conclusions:
- Soil salinity enhances cyanogenesis in white clover, boosting resistance against natural herbivores.
- Salinity-mediated alterations in plant cyanogenesis offer a novel defense mechanism.
- Further research is needed to evaluate implications for livestock grazing.
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