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A comparison of the molecular mechanisms underpinning high-intensity, pulsed polychromatic light and low-intensity UV-C hormesis in tomato fruit

Scott, G.; Dickinson, Matthew; Shama, G.; Rupar, M.

Authors

G. Scott G.Scott@lboro.ac.uk

G. Shama

M. Rupar



Abstract

Postharvest treatment of tomato fruit with high-intensity, pulsed polychromatic light (HIPPL) has previously been shown to induce delayed ripening and disease resistance comparable to that of low-intensity UV-C (LIUV). Little, however, is known of the mechanisms underpinning postharvest HIPPL hormesis in tomato fruit. Expression of genes involved in plant hormone biosynthesis, defence, secondary metabolism and ripening were monitored 24 h post treatment (24 HPT), 10 d post treatment (10 DPT) and 12 h post inoculation with Botrytis cinerea (12 HPI). All genes monitored were constitutively expressed and changes in expression profiles following treatment were highly similar for both HIPPL and LIUV treatments. Expression of pathogenesis-related proteins P4, β-1,3,-Glucanase and Chitinase 9 and a jasmonate biosynthesis enzyme (OPR3), were significantly upregulated at 10 DPT and 12 HPI. Both treatments significantly downregulated the expression of polygalacturonase and flavonol synthase at 10 DPT and 12 HPI. Ethylene biosynthesis enzyme ACO1 and β-carotene hydroxylase were significantly upregulated at 24 HPT, and phenylalanine ammonia-lyase (PAL) was significantly upregulated at 12 HPI. Both HIPPL and LIUV treatments stimulate defence responses that are mediated by salicylic acid, jasmonic acid and ethylene. This may lead to broad range resistance against both necrotrophic and biotrophic pathogens as well as abiotic stresses and herbivorous pests. Following inoculation with B. cinerea only PAL showed indication of a gene priming response for HIPPL- and LIUV-treated fruit.

Citation

Scott, G., Dickinson, M., Shama, G., & Rupar, M. (2018). A comparison of the molecular mechanisms underpinning high-intensity, pulsed polychromatic light and low-intensity UV-C hormesis in tomato fruit. Postharvest Biology and Technology, 137, https://doi.org/10.1016/j.postharvbio.2017.10.017

Journal Article Type Article
Acceptance Date Oct 31, 2017
Online Publication Date Nov 20, 2017
Publication Date Mar 31, 2018
Deposit Date Nov 28, 2017
Publicly Available Date May 21, 2019
Journal Postharvest Biology and Technology
Print ISSN 0925-5214
Electronic ISSN 0925-5214
Publisher Elsevier
Peer Reviewed Peer Reviewed
Volume 137
DOI https://doi.org/10.1016/j.postharvbio.2017.10.017
Keywords Hormesis; Solanum lycopersicum; Pulsed light; Gene expression; Polychromatic light
Public URL http://eprints.nottingham.ac.uk/id/eprint/48418
Publisher URL https://doi.org/10.1016/j.postharvbio.2017.10.017
Copyright Statement Copyright information regarding this work can be found at the following address: http://creativecommons.org/licenses/by-nc-nd/4.0

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Tomato Manuscript (postec 2017-311 )(REV2).pdf (1.2 Mb)
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Copyright Statement
Copyright information regarding this work can be found at the following address: http://creativecommons.org/licenses/by-nc-nd/4.0





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