Abstract
In the present study, we combined transient temperature and light stress (sunfleck) and comparably analyzed photosynthetic gas exchange in Grey poplar which has been genetically modified in isoprene emission capacity. Overall, we demonstrate that for poplar leaves the ability to emit isoprene is crucial to maintain photosynthesis when exposed to sunflecks. Net CO2 assimilation and electron transport rates were strongly impaired in sunfleck-treated non-isoprene emitting poplars. Similar impairment was not detected when the leaves were exposed to high light (lightflecks) only. Within 10 h non-isoprene emitting poplars recovered from sunfleck-related impairment as indicated by chlorophyll fluorescence and microarray analysis. Unstressed leaves of non-isoprene emitting poplars had higher ascorbate contents, but also higher contents of malondialdehyde than wild-type. Microarray analyses revealed lipid and chlorophyll degradation processes in the non-isoprene emitting poplars. Thus, there is evidence for an adjustment of the antioxidative system in the non-isoprene emitting poplars even under normal growth conditions.
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Abbreviations
- ASC:
-
Ascorbate
- BHT:
-
Butylated hydroxytoluene
- CHL:
-
Chlorophyllase
- DHA:
-
Dehydroascorbate
- DPS:
-
De-epoxidation status
- ETR:
-
Electron transport rate
- FIS:
-
Fast isoprene sensor
- JA:
-
Jasmonate
- LHCII:
-
Light harvesting complex II
- MDA:
-
Malondialdehyde
- MeJA:
-
Methyljasmonate
- MEP:
-
Methylerythritol 4-phosphate
- OPDA:
-
12-oxophytodienoic acid
- PcISPS:
-
Populus × canescens isoprene synthase
- PPFD:
-
Photosynthetic photon flux density
- RNAi:
-
RNA interference
- ROS:
-
Reactive oxygen species
- TAG:
-
Triacylglyceride
- TBA:
-
Thiobarbituric acid
- TCA:
-
Trichloroacetic acid
- WT:
-
Wild-type
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Acknowledgements
We thank Ursula Scheerer (University of Freiburg) for ascorbate and glutathione analyses and Danielle Way (Duke University, Durham NC) for helpful comments on the manuscript. The work was supported by the German Science Foundation (DFG) (SCHN653/4 to J.-P.S.) within the German joint research group ‘Poplar—A Model to Address Tree-Specific Questions’ and by the European Commission in the frame of the Marie-Curie Research Training Network ‘ISONET’ (J.-P.S.).
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Katja Behnke and Maaria Loivamäki have contributed equally to the manuscript.
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Behnke, K., Loivamäki, M., Zimmer, I. et al. Isoprene emission protects photosynthesis in sunfleck exposed Grey poplar. Photosynth Res 104, 5–17 (2010). https://doi.org/10.1007/s11120-010-9528-x
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DOI: https://doi.org/10.1007/s11120-010-9528-x