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• W2885456908 abstract "Premise of the Study The maintenance of adaptive polymorphisms within species requires fitness trade‐offs reflecting selection for each morph. Cyanogenesis, the ability to produce hydrogen cyanide ( HCN ) after tissue damage, occurs in >3000 plant species and exists as a discrete polymorphism in white clover. This polymorphism is spatially distributed in recurrent clines, with higher frequencies of cyanogenic plants in warmer climates. The HCN autotoxicity hypothesis proposes that cyanogenic plants are selected against where frosts are common, as freezing liberates HCN and could impair cellular respiration. Methods We tested the HCN autotoxicity hypothesis using a freezing chamber to examine survival, tissue damage, and physiological recovery as assessed via chlorophyll fluorescence following mild and severe freezing treatments. We utilized 65 genotypes from a single polymorphic population to eliminate effects of population structure. Key Results Cyanogenic plants did not differ from acyanogenic plants in survival, tissue damage, or recovery following freezing. However, plants producing either of the two required cyanogenic precursors had lower survival and tissue damage after freezing than plants lacking both precursors. Conclusions These results suggest that freezing‐induced HCN toxicity is unlikely to be responsible for the maintenance of the cyanogenesis polymorphism in white clover. However, energetic trade‐offs associated with costs of producing the cyanogenic precursors may confer a fitness benefit to acyanogenic plants under stressful climatic conditions. The lack of evidence for HCN toxicity suggests that cyanogenic clover uses physiological mechanisms mediated by β‐cyanoalanine synthase and alternative oxidase to maintain cellular function in the presence of HCN ." @default.
• W2885456908 created "2018-08-22" @default.
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• W2885456908 date "2018-07-01" @default.
• W2885456908 modified "2023-10-16" @default.
• W2885456908 title "Freeze‐induced cyanide toxicity does not maintain the cyanogenesis polymorphism in white clover (<i>Trifolium repens</i>)" @default.
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• W2885456908 doi "https://doi.org/10.1002/ajb2.1134" @default.
• W2885456908 hasPubMedId "https://pubmed.ncbi.nlm.nih.gov/30080261" @default.
• W2885456908 hasPublicationYear "2018" @default.
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