Abstract
Key message
Viral-induced gene silencing of selected biosynthetic genes decreased overall carotenoid accumulation in California poppy. Regulation of carotenogenesis was linked with pigment sequestration, not changes in biosynthetic gene expression.
Abstract
Genes of carotenogenesis are well described, but understanding how they affect carotenoid accumulation has proven difficult because of plant lethality when the pigments are lacking. Here, we used a Tobacco Rattle Virus-based virus-induced-gene-silencing (VIGS) approach in California poppy (Eschscholzia californica) to investigate how silencing of the carotenoid biosynthetic pathway genes affects carotenoid metabolite accumulation and RNA transcript abundance of the carotenoid biosynthetic pathway genes. VIGS of upstream (PDS and ZDS) and downstream (βOH and ZEP) genes reduced transcript abundance of the targeted genes in the poppy petals while having no effect on abundance of the other carotenogenesis genes. Silencing of PDS, ZDS, βOH and ZEP genes reduced total pigment concentration by 75–90% and altered petal colour. HPLC and LC-MS measurements suggested that petal colour changes were caused by substantially altered pigment profiles and quantity. Carotenoid metabolites were different to those normally detected in wild-type petals accumulated but overall carotenoid concentration was less, suggesting the chemical form of carotenoid was important for whether it could be stored at high amounts. In poppy petals, eschscholtzxanthin and retro-carotene-triol were the predominant carotenoids, present mainly as esters. Specific esterification enzymes for specific carotenoids and/or fatty acids appear key for enabling petal carotenoids to accumulate to high amounts. Our findings argue against a direct role for carotenoid metabolites regulating carotenogenesis genes in the petals of California poppy as transcript abundance of carotenogenesis genes studied was unchanged, while the petal carotenoid metabolite profile changed substantially.
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Acknowledgements
Thanks to Philippa Barrell (Plant & Food Research, Lincoln) for providing the initial California poppy petal cDNA and to Dr Mark Fiers (Plant & Food Research, Lincoln) for providing sequences from the California poppy 454 sequence database. Thanks also to Ian King for managing the plants in the containment facility and to Dinesh Kumar for providing the pTRV plasmids. Thanks to Dr Nigel Joyce (Plant & Food Research, Lincoln) for performing LCMS. We thank Duncan Hedderley for the statistical analysis. We thank F. Hofmann-La Roche for supplying zeaxanthin as a purified standard for analysis of carotenoid pigments.
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Communicated by Salim Al-Babili.
Dedicated to the memory of Michael McManus, September 1957-July 2015.
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Zhou, J., Hunter, D.A., Lewis, D.H. et al. Insights into carotenoid accumulation using VIGS to block different steps of carotenoid biosynthesis in petals of California poppy. Plant Cell Rep 37, 1311–1323 (2018). https://doi.org/10.1007/s00299-018-2314-5
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DOI: https://doi.org/10.1007/s00299-018-2314-5