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Arabidopsis mutants reveal that short- and long-term thermotolerance have different requirements for trienoic fatty acids

Journal Article · · Journal of Experimental Botany
DOI:https://doi.org/10.1093/jxb/err381· OSTI ID:1625377
 [1];  [2];  [2];  [2]
  1. Washington State Univ., Pullman, WA (United States). Inst. of Biological Chemistry; DOE/OSTI
  2. Washington State Univ., Pullman, WA (United States). Inst. of Biological Chemistry
The photosynthetic thylakoid has the highest level of lipid unsaturation of any membrane. In Arabidopsis thaliana plants grown at 22 C, approximately 70% of the thylakoid fatty acids are trienoic – they have three double bonds. In Arabidopsis, and other species, the levels of trienoic fatty acids decline substantially at higher temperatures. Several genetic studies indicate that reduced unsaturation improves photosynthetic function and plant survival at high temperatures. Here, these studies are extended using the Arabidopsis triple mutant, fad3-2 fad7-2 fad8 that contains no detectable trienoic fatty acids. In the short-term, fluorescence analyses and electron-transport assays indicated that photosynthetic functions in this mutant are more thermotolerant than the wild type. However, long-term photosynthesis, growth, and survival of plants were all compromised in the triple mutant at high temperature. The fad3-2 fad7-2 fad8 mutant is deficient in jasmonate synthesis and this hormone has been shown to mediate some aspects of thermotolerance; however, additional experiments demonstrated that a lack of jasmonate was not a major factor in the death of triple-mutant plants at high temperature. The results indicate that long-term thermotolerance requires a basal level of trienoic fatty acids. Thus, the success of genetic and molecular approaches to increase thermotolerance by reducing membrane unsaturation will be limited by countervailing effects that compromise essential plant functions at elevated temperatures.
Research Organization:
Washington State Univ., Pullman, WA (United States)
Sponsoring Organization:
USDOE Office of Science (SC)
Grant/Contract Number:
FG02-99ER20323
OSTI ID:
1625377
Journal Information:
Journal of Experimental Botany, Journal Name: Journal of Experimental Botany Journal Issue: 3 Vol. 63; ISSN 0022-0957
Publisher:
Oxford University PressCopyright Statement
Country of Publication:
United States
Language:
English

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Sphingolipids: towards an integrated view of metabolism during the plant stress response journal July 2019
Decreased photosynthetic rate under high temperature in wheat is due to lipid desaturation, oxidation, acylation, and damage of organelles journal April 2018
Far-Red Light-Mediated Seedling Development in Arabidopsis Involves FAR-RED INSENSITIVE 219/JASMONATE RESISTANT 1-Dependent and -Independent Pathways journal July 2015
Threonine 286 of fatty acid desaturase 7 is essential for ω-3 fatty acid desaturation in the green microalga Chlamydomonas reinhardtii journal February 2015
Lipid Antioxidant and Galactolipid Remodeling under Temperature Stress in Tomato Plants journal February 2016
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Lipidomic Remodeling in Begonia grandis Under Heat Stress journal February 2022
Leaf Lipid Alterations in Response to Heat Stress of Arabidopsis thaliana journal July 2020
Grazing increases the unsaturated fatty acid concentration of milk from grass-fed cows: A review of the contributing factors, challenges and future perspectives: Effect of grazing on milk fatty acid composition journal August 2015
Landscape of the lipidome and transcriptome under heat stress in Arabidopsis thaliana journal May 2015
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Neighbour signals perceived by phytochrome B increase thermotolerance in Arabidopsis journal May 2019
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