Individual and interactive effects of temperature and light intensity on canola growth, physiological characteristics and methane emissions.

Autor: Martel AB; Department of Biology, Saint Mary's University, 923 Robie Street, Halifax, Nova Scotia, B3H 3C3, Canada., Taylor AE; Department of Biology, Mount Saint Vincent University, 166 Bedford Highway, Halifax, Nova Scotia, B3M 2J6, Canada., Qaderi MM; Department of Biology, Saint Mary's University, 923 Robie Street, Halifax, Nova Scotia, B3H 3C3, Canada; Department of Biology, Mount Saint Vincent University, 166 Bedford Highway, Halifax, Nova Scotia, B3M 2J6, Canada. Electronic address: mirwais.qaderi@msvu.ca.
Jazyk: angličtina
Zdroj: Plant physiology and biochemistry : PPB [Plant Physiol Biochem] 2020 Dec; Vol. 157, pp. 160-168. Date of Electronic Publication: 2020 Oct 23.
DOI: 10.1016/j.plaphy.2020.10.016
Abstrakt: Earlier studies have shown that plants produce methane (CH 4 ) under aerobic conditions, and that this emission is not microbial in nature. However, the precursors of aerobic CH 4 remain under debate, and the combined effects of environmental factors on plant-derived CH 4 requires further attention. The objective of this study was to determine the interactive effects of temperature and light intensity on CH 4 and other relevant plant parameters in canola (Brassica napus L.). Plants were grown under two temperature regimes (22/18 °C and 28/24 °C, 16 h light/8 h dark) and two light intensities (300 and 600 μmol photons m -2 s -1 ) for 21 days after one week of growth under 22/18 °C (16 h light/8 h dark). In this study, higher temperature had little effects on CH 4 emissions from plants, indicating the mitigating effects of higher light intensity. Higher light intensity, however, significantly decreased CH 4 , which was inversely related to plant dry mass. Higher light intensity decreased stem height, leaf area ratio, chlorophyll, nitrogen balance index, leaf moisture, methionine (Met) and ethylene (C 2 H 4 ), but increased specific leaf mass, photochemical quenching, flavonoids, epicuticular wax, lysine and tyrosine. The results revealed that increased CH 4 emissions from plants could be related to changes in plant physiological activities, which portrayed themselves in increased C 2 H 4 evolution, and methylated amino acids, such as Met. We conclude that higher light intensity reduces Met and, in turn, CH 4 and C 2 H 4 emissions, but lower light intensity enhances CH 4 formation through cleavage of methyl group of amino acids by reactive oxygen species, as previously suggested.
(Copyright © 2020 Elsevier Masson SAS. All rights reserved.)
Databáze: MEDLINE
Externí odkaz: