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Hormetic UV-C seed treatments for the control of tomato diseases

Scott, G.; Almasrahi, A.; Malekpoor Mansoorkhani, F.; Rupar, M.; Dickinson, M.; Shama, G.


G. Scott

A. Almasrahi

M. Rupar

G. Shama


© 2019 British Society for Plant Pathology Hormesis is a dose response phenomenon in which low, non-damaging doses of a stressor bring about a positive response in the organism undergoing treatment. Evidence is provided here that hormetic UV-C treatments of tomato seed can control disease caused by Botrytis cinerea, Fusarium oxysporum f. sp. lycopersici (FOL) and f. sp. radicis-lycopersici (FORL) on tomato (Solanum lycopersicum). Treating seeds with a 4kJm−2 dose of UV-C significantly reduced both the disease incidence and progression of B.cinerea, with approximately 10% reductions in both on cv. Shirley. Disease severity assays for FOL and FORL on cv. Moneymaker showed dose-dependent responses: UV-C treatments of 4 and 6kJm−2 significantly reduced the disease severity scores of FOL, whilst only the 6kJm−2 showed significant reductions for FORL. To determine the effects of treatment on germination and seedling growth, UV-C doses of 4, 8 and 12kJm−2 were performed on cv. Shirley. No negative impacts on germination or seedling growth were observed for any of the treatments. However, the 8kJm−2 treatment showed significant biostimulation, with increases in seedling, root and hypocotyl dry weight of 11.4%, 23.1% and 12.0%, respectively, when compared to the control. Furthermore, significant increases in the root-mass fraction (10.6%) and root:shoot ratio (13.1%) along with a decrease in shoot-mass fraction (2.0%) indicates that the 8kJm−2 treatment stimulated root growth to the greatest extent. There was no effect on hypocotyl and primary root length or the number of lateral roots, indicating no adverse effects to basic root architecture or seedling growth.


Scott, G., Almasrahi, A., Malekpoor Mansoorkhani, F., Rupar, M., Dickinson, M., & Shama, G. (2019). Hormetic UV-C seed treatments for the control of tomato diseases. Plant Pathology, 68(4), 700-707.

Journal Article Type Article
Acceptance Date Jan 19, 2019
Online Publication Date Feb 11, 2019
Publication Date May 1, 2019
Deposit Date Jun 12, 2019
Publicly Available Date Jun 12, 2019
Journal Plant Pathology
Print ISSN 0032-0862
Electronic ISSN 1365-3059
Publisher Wiley
Peer Reviewed Peer Reviewed
Volume 68
Issue 4
Pages 700-707
Keywords Agronomy and Crop Science; Plant Science; Genetics; Horticulture
Public URL
Publisher URL
Additional Information This is the peer reviewed version of the following article: Scott, G. , Almasrahi, A. , Malekpoor Mansoorkhani, F. , Rupar, M. , Dickinson, M. and Shama, G. (2019), Hormetic UV‐C seed treatments for the control of tomato diseases. Plant Pathol, 68: 700-707, which has been published in final form at This article may be used for non-commercial purposes in accordance with Wiley Terms and Conditions for Use of Self-Archived Versions.


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