Abstract
Methane (CH4) is the second most important anthropogenic greenhouse gas after carbon dioxide (CO2), with a global warming potential of nearly 34 times higher than CO2. Earlier studies have shown that plants produce CH4 under aerobic conditions. However, few studies have measured aerobically-produced CH4 emissions from plants that were grown under sterile conditions. It is therefore important to measure plant-derived CH4 and determine the new driving factors of its emissions. We examined the individual and interactive effects of blue light and abscisic acid (ABA) on plant biomass, moisture content and CH4 emissions of canola (Brassica napus) plants that were grown under sterile conditions. Plants were grown at three blue light irradiances (0, 2 and 4 mW cm−2) and supplied with two concentrations of ABA (0 and 100 μmol L−1) for 2 weeks. Methane emissions were measured in gas samples from the culture vessels. Overall, this study revealed that exogenous ABA and supplemental blue light increased CH4 emissions somewhat independent from each other, but decreased plant biomass. On dry mass basis, blue light increased CH4 emission. On fresh mass basis, blue light decreased root mass, and ABA application decreased leaf, stem and total mass. On dry mass basis, blue light and ABA decreased root mass. Higher blue light decreased the ABA-applied plant biomass. The ABA-applied plants had decreased moisture content. Methane had many significant relationships with other plant parameters. In conclusion, plants that were exposed to blue light or treated with ABA were stressed and emitted more CH4 than the non-stressed plants.
Original language | English |
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Pages (from-to) | 271-280 |
Number of pages | 10 |
Journal | Theoretical and Experimental Plant Physiology |
Volume | 33 |
Issue number | 3 |
DOIs | |
Publication status | Published - Sept 2021 |
Externally published | Yes |
Bibliographical note
Funding Information:We acknowledge Natural Sciences and Engineering Research Council (NSERC) of Canada for financial support through a Discovery grant to MMQ, and an NSERC USRA award to CRLC. Leaders Opportunity Fund from Canadian Foundation for Innovation (CFI), Nova Scotia Research and Innovation Trust (NSRIT) and Mount Saint Vincent University to MMQ is greatly acknowledged. We also thank BrettYoung Seeds for supplying canola seeds. We appreciate the useful comments on the manuscript from an Associate Editor and two anonymous referees.
Publisher Copyright:
© 2021, Brazilian Society of Plant Physiology.
ASJC Scopus Subject Areas
- Agronomy and Crop Science
- Plant Science