Influence of episodes of summer O3 on delta (5) and delta (9) fatty acids in autumnal lipids of Norway spruce (Picea abies (L.) Karst).

Lancaster Environment Centre

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https://doi.org/10.1111/j.1469-8137.1994.tb04286.x
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Keywords

Conifers • desaturation • monogalactosyl diglyceride • phosphatidyl choline • winter hardiness

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Influence of episodes of summer O3 on delta (5) and delta (9) fatty acids in autumnal lipids of Norway spruce (Picea abies (L.) Karst). / Wellburn, A. R.; Robinson, D. C.; Thomson, A. et al.
In: New Phytologist, Vol. 127, No. 2, 1994, p. 355-361.

Research output: Contribution to Journal/Magazine › Journal article › peer-review

Bibtex

@article{7082bacada1c4169b62248d612247dfa,

title = "Influence of episodes of summer O3 on delta (5) and delta (9) fatty acids in autumnal lipids of Norway spruce (Picea abies (L.) Karst).",

abstract = "Current year needles from 5 yr-old Norway spruce trees, which had been exposed to either episodes of atmospheric O3, or periodic mistings with simulated acid rainwater throughout three summer periods, were-analyzed for changes in molar percentages and ratios of fatty acids isolated from different lipids at the time of maximum winter hardening. No significant changes due to acidic misting were detected but significant decreases in the degree of unsaturation off both C 16 and C18, fatty acids, the molar percentage of δ5,9,12,15, and the molar ratio δ5,918: 2 to δ9,1218:2 in monogalactosyl diglyceride (MGDG) due to summer 03 exposures were found. Molar percentages and ratios of fatty acids did not change much in other lipids bur these changes in plastidie MGDG could be traced to a significant effect of summer O3 on the δ4- and δ12 -desaturases acting upon phosphatidyl choline (PC) in the endoplasmic reticulum. The replacement of the δ6-subset of C18 fatty acids by an equivalent δ5-series throughout was confirmed by Gas chromatography and mass spectrometry Molecular modelling also showed that the δ5 forms, which resembled the δ5-isomers, are very different in shape to the δ5-series and this may account, in part, for the extremely low winter temperatures from which Norway spruce needles may recover.",

keywords = "Conifers • desaturation • monogalactosyl diglyceride • phosphatidyl choline • winter hardiness",

author = "Wellburn, {A. R.} and Robinson, {D. C.} and A. Thomson and Leith, {I. D.}",

year = "1994",

doi = "10.1111/j.1469-8137.1994.tb04286.x",

language = "English",

volume = "127",

pages = "355--361",

journal = "New Phytologist",

issn = "1469-8137",

publisher = "Wiley",

number = "2",

}

RIS

TY - JOUR

T1 - Influence of episodes of summer O3 on delta (5) and delta (9) fatty acids in autumnal lipids of Norway spruce (Picea abies (L.) Karst).

AU - Wellburn, A. R.

AU - Robinson, D. C.

AU - Thomson, A.

AU - Leith, I. D.

PY - 1994

Y1 - 1994

N2 - Current year needles from 5 yr-old Norway spruce trees, which had been exposed to either episodes of atmospheric O3, or periodic mistings with simulated acid rainwater throughout three summer periods, were-analyzed for changes in molar percentages and ratios of fatty acids isolated from different lipids at the time of maximum winter hardening. No significant changes due to acidic misting were detected but significant decreases in the degree of unsaturation off both C 16 and C18, fatty acids, the molar percentage of δ5,9,12,15, and the molar ratio δ5,918: 2 to δ9,1218:2 in monogalactosyl diglyceride (MGDG) due to summer 03 exposures were found. Molar percentages and ratios of fatty acids did not change much in other lipids bur these changes in plastidie MGDG could be traced to a significant effect of summer O3 on the δ4- and δ12 -desaturases acting upon phosphatidyl choline (PC) in the endoplasmic reticulum. The replacement of the δ6-subset of C18 fatty acids by an equivalent δ5-series throughout was confirmed by Gas chromatography and mass spectrometry Molecular modelling also showed that the δ5 forms, which resembled the δ5-isomers, are very different in shape to the δ5-series and this may account, in part, for the extremely low winter temperatures from which Norway spruce needles may recover.

AB - Current year needles from 5 yr-old Norway spruce trees, which had been exposed to either episodes of atmospheric O3, or periodic mistings with simulated acid rainwater throughout three summer periods, were-analyzed for changes in molar percentages and ratios of fatty acids isolated from different lipids at the time of maximum winter hardening. No significant changes due to acidic misting were detected but significant decreases in the degree of unsaturation off both C 16 and C18, fatty acids, the molar percentage of δ5,9,12,15, and the molar ratio δ5,918: 2 to δ9,1218:2 in monogalactosyl diglyceride (MGDG) due to summer 03 exposures were found. Molar percentages and ratios of fatty acids did not change much in other lipids bur these changes in plastidie MGDG could be traced to a significant effect of summer O3 on the δ4- and δ12 -desaturases acting upon phosphatidyl choline (PC) in the endoplasmic reticulum. The replacement of the δ6-subset of C18 fatty acids by an equivalent δ5-series throughout was confirmed by Gas chromatography and mass spectrometry Molecular modelling also showed that the δ5 forms, which resembled the δ5-isomers, are very different in shape to the δ5-series and this may account, in part, for the extremely low winter temperatures from which Norway spruce needles may recover.

KW - Conifers • desaturation • monogalactosyl diglyceride • phosphatidyl choline • winter hardiness

U2 - 10.1111/j.1469-8137.1994.tb04286.x

DO - 10.1111/j.1469-8137.1994.tb04286.x

M3 - Journal article

VL - 127

SP - 355

EP - 361

JO - New Phytologist

JF - New Phytologist

SN - 1469-8137

IS - 2

ER -

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