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Published on: March 1, 2022
Thermogenesis-triggered seed dispersal in dwarf mistletoe
Rolena A J deBruyn1, Mark Paetkau2, Kelly A Ross3
1Department of Biological Sciences, Thompson Rivers University, Kamloops, British Columbia, Canada V2C 0C8.
Seed dispersal in lodgepole pine dwarf mistletoe (DM) is triggered by heat. Thermogenesis, or internal heat production, causes an explosive discharge of seeds, a phenomenon previously unobserved in plants.
Area of Science:
- Plant Biology
- Ecology
- Biophysics
Background:
- Lodgepole pine dwarf mistletoe (Arceuthobium americanum) is a North American forest pathogen.
- Seed dispersal in this parasitic plant occurs via explosive discharge.
- Warming ripe fruit can trigger this explosive discharge.
Purpose of the Study:
- Investigate if endogenous heat production (thermogenesis) induces seed discharge in dwarf mistletoe.
- Explore the mechanism behind the explosive seed dispersal.
Main Methods:
- Utilized infrared thermography to measure fruit surface temperature changes before dehiscence.
- Employed modulated differential scanning calorimetry (MDSC) to detect thermal events.
- Analyzed non-reversible heat flow associated with seed discharge.
Main Results:
- Ripe dwarf mistletoe fruits exhibited a significant surface temperature increase (2.1±0.8°C) preceding discharge.
- MDSC revealed a consistent exothermic event (~1 J g⁻¹) just before dehiscence.
- These findings indicate a thermogenesis-driven explosive discharge mechanism.
Conclusions:
- Thermogenesis is the likely trigger for explosive seed discharge in lodgepole pine dwarf mistletoe.
- This represents a novel mechanism of seed dispersal not previously documented in any plant species.
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