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UV-B and far-red light shape morphological and phytochemical responses in kratom
Mengzi Zhang1, Siva Rama Raju Kanumuri2, Paul R Fisher3
1Mid-Florida Research and Education Center, Horticultural Sciences Department, Institute of Food and Agricultural Sciences, University of Florida, Apopka, FL, United States.
Altering light conditions, including far-red light and UV-B exposure, significantly impacts kratom (Mitragyna speciosa) growth and alkaloid production. Careful light management is crucial for optimizing both biomass and desired alkaloid content in kratom cultivation.
Area of Science:
- Plant Science
- Photobiology
- Phytochemistry
Background:
- Kratom (Mitragyna speciosa) alkaloids have pharmacological interest.
- Understanding environmental influences on kratom is crucial for cultivation.
- Light quality, especially UV-B, may affect kratom growth and alkaloid biosynthesis.
Purpose of the Study:
- To evaluate the effects of far-red (FR) light and end-of-day (EOD) UV-B on kratom.
- To assess impacts on plant growth, photosynthetic performance, and leaf alkaloid content.
- To inform lighting strategies for optimizing kratom cultivation.
Main Methods:
- Controlled-environment study with five light treatments.
- Treatments included white light, EOD UV-B, and FR light supplementation.
- Measurements of plant growth, photosynthesis, and alkaloid concentration were performed.
Main Results:
- Extended EOD UV-B reduced stem caliper, branching, and leaf area.
- FR supplementation induced shade-avoidance responses, increasing height but reducing biomass.
- Specific alkaloid concentrations varied; corynantheidine increased under UV-B, while others decreased.
Conclusions:
- Light-quality-induced stress modifies kratom alkaloid accumulation.
- Balancing light stress against growth and biomass reduction is necessary.
- Findings provide a basis for optimizing lighting strategies in kratom cultivation.
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