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Volume 16
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Communication

Can Bio-Based Stomatal Blockers Inhibit Rapeseed Growth?

by
Michele Faralli
1,2,
Minuka Weerasinghe
1,
Gee-Sian Leung
3,4,
Ray Marriott
3,5,
Melville Miles
6,
James M. Monaghan
1 and
Peter Kettlewell
1,*
1
Crop Science Group, Harper Adams University, Newport, Shropshire TF10 8NB, UK
2
Center Agriculture Food Environment (C3A), University of Trento, 38098 San Michele all’Adige, Italy
3
Suprex Limited, Unit 10, Zone 6, Cibyn Industrial Estate, Caernarfon, Gwynedd LL55 2BD, UK
4
Evergreen Scientific, Acuity Law, 3 Assembly Square, Britannia Quay, Cardiff CF10 4PL, UK
5
Bridge Farm Bioscience Limited, Horseshoe Road, Spalding PE11 3BE, UK
6
Freshtime Limited, The Found Riverside Industrial Estate, Marsh Lane, Boston PE21 7PJ, UK
*
Author to whom correspondence should be addressed.
Int. J. Plant Biol. 2025, 16(3), 98; https://doi.org/10.3390/ijpb16030098 (registering DOI)
Submission received: 24 July 2025 / Revised: 15 August 2025 / Accepted: 18 August 2025 / Published: 21 August 2025
(This article belongs to the Section Plant Physiology)
Versions Notes

Abstract

Stomatal blockers are hydrophobic polymers applied to leaves to physically block stomatal pores and restrict gas exchange, and which have potential as plant growth regulators to retard growth. Three experiments in a heated glasshouse, one sown in autumn and two sown in winter, were conducted with pot-grown rapeseed plants at the four-leaf stage to evaluate retardant potential of two bio-based polymers: di-1-p-menthene (DPM) and extracted cauliflower leaf wax. Both stomatal blockers reduced stomatal conductance and plant dry weight in the autumn-sown experiment, when solar radiation was high during leaf development and stomatal conductance of water-treated plants was relatively high. Wax was more effective than DPM at reducing plant dry weight, despite no difference in stomatal conductance. In the two winter-sown experiments, when solar radiation was lower during leaf development, stomatal conductance in water-treated plants was less than in the autumn-sown experiment. Stomatal conductance was reduced by the blockers in the winter-sown experiments, but plant dry weight was unaffected. It was concluded that stomatal blockers may have potential to act as plant growth regulators to retard growth in rapeseed, but further research is necessary to define the circumstances when a response will occur.
Keywords: oilseed rape; canola; porometer; terpene; epicuticular wax; PGR; delay; hold; slow; inhibit oilseed rape; canola; porometer; terpene; epicuticular wax; PGR; delay; hold; slow; inhibit

Share and Cite

MDPI and ACS Style

Faralli, M.; Weerasinghe, M.; Leung, G.-S.; Marriott, R.; Miles, M.; Monaghan, J.M.; Kettlewell, P. Can Bio-Based Stomatal Blockers Inhibit Rapeseed Growth? Int. J. Plant Biol. 2025, 16, 98. https://doi.org/10.3390/ijpb16030098

AMA Style

Faralli M, Weerasinghe M, Leung G-S, Marriott R, Miles M, Monaghan JM, Kettlewell P. Can Bio-Based Stomatal Blockers Inhibit Rapeseed Growth? International Journal of Plant Biology. 2025; 16(3):98. https://doi.org/10.3390/ijpb16030098

Chicago/Turabian Style

Faralli, Michele, Minuka Weerasinghe, Gee-Sian Leung, Ray Marriott, Melville Miles, James M. Monaghan, and Peter Kettlewell. 2025. "Can Bio-Based Stomatal Blockers Inhibit Rapeseed Growth?" International Journal of Plant Biology 16, no. 3: 98. https://doi.org/10.3390/ijpb16030098

APA Style

Faralli, M., Weerasinghe, M., Leung, G.-S., Marriott, R., Miles, M., Monaghan, J. M., & Kettlewell, P. (2025). Can Bio-Based Stomatal Blockers Inhibit Rapeseed Growth? International Journal of Plant Biology, 16(3), 98. https://doi.org/10.3390/ijpb16030098

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