Abstract
Over the last decades, post-illumination bursts (PIBs) of isoprene, acetaldehyde and green leaf volatiles (GLVs) following rapid light-to-dark transitions have been reported for a variety of different plant species. However, the mechanisms triggering their release still remain unclear. Here we measured PIBs of isoprene-emitting (IE) and isoprene non-emitting (NE) grey poplar plants grown under different climate scenarios (ambient control and three scenarios with elevated CO2 concentrations: elevated control, periodic heat and temperature stress, chronic heat and temperature stress, followed by recovery periods). PIBs of isoprene were unaffected by elevated CO2 and heat and drought stress in IE, while they were absent in NE plants. On the other hand, PIBs of acetaldehyde and also GLVs were strongly reduced in stress-affected plants of all genotypes. After recovery from stress, distinct differences in PIB emissions in both genotypes confirmed different precursor pools for acetaldehyde and GLV emissions. Changes in PIBs of GLVs, almost absent in stressed plants and enhanced after recovery, could be mainly attributed to changes in lipoxygenase activity. Our results indicate that acetaldehyde PIBs, which recovered only partly, derive from a new mechanism in which acetaldehyde is produced from methylerythritol phosphate pathway intermediates, driven by deoxyxylulose phosphate synthase activity.
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Claims 9
Claim · model-written summary
Isoprene bursts in emitting poplar were unaffected by elevated carbon dioxide, heat, or drought.
- Material
- IEe0
- Treatment
- elevated CO2 and heat and drought stresse0
- Outcome
- PIBs of isoprenee0
- Direction
- unaffectede0
PopulusNot reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“PIBs of isoprene were unaffected by elevated CO2 and heat and drought stress in IE”
t0“poplar”
Claim · model-written summary
Isoprene bursts were absent in non-emitting poplar.
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“they were absent in NE plants”
t0“non‐emitting poplar”
Claim · model-written summary
Stress reduced acetaldehyde bursts across genotypes.
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“PIBs of acetaldehyde and also GLVs were strongly reduced in stress-affected plants of all genotypes”
t0“poplar”
Claim · model-written summary
Stress reduced green leaf volatile bursts across genotypes.
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“PIBs of acetaldehyde and also GLVs were strongly reduced in stress-affected plants of all genotypes”
t0“poplar”
Claim · model-written summary
After recovery, volatile bursts differed between emitting and non-emitting genotypes.
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“After recovery from stress, distinct differences in PIB emissions in both genotypes confirmed different precursor pools for acetaldehyde and GLV emissions.”
t0“poplar”
Claim · model-written summary
Green leaf volatile bursts were nearly absent during stress and enhanced after recovery.
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“PIBs of GLVs, almost absent in stressed plants and enhanced after recovery”
t0“poplar”
Claim · model-written summary
Changes in green leaf volatile bursts were mainly attributed to lipoxygenase activity.
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Changes in PIBs of GLVs, almost absent in stressed plants and enhanced after recovery, could be mainly attributed to changes in lipoxygenase activity.”
t0“poplar”
Claim · model-written summary
Acetaldehyde bursts recovered only partly.
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“acetaldehyde PIBs, which recovered only partly”
t0“poplar”
Claim · model-written summary
The authors propose that acetaldehyde bursts arise from methylerythritol phosphate intermediates driven by deoxyxylulose phosphate synthase.
- Gene
- deoxyxylulose phosphate synthasee0
- Compound
- methylerythritol phosphate pathway intermediatese0
- Outcome
- acetaldehyde is producede0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“acetaldehyde is produced from methylerythritol phosphate pathway intermediates, driven by deoxyxylulose phosphate synthase activity”
t0“poplar”
The same questions in other papers
co2 · molecular: metabolites · Populus (poplar)Positive and negative results
1 paper in the same direction as this paper · 1 in the opposite direction
- positive
- no effect
heat · molecular: metabolites · Populus (poplar)Positive and negative results
2 papers in the same direction as this paper · 1 in the opposite direction
- positive
- negative
- no effect
drought · molecular: metabolites · Populus (poplar)Positive and negative results
1 paper in the same direction as this paper · 4 in the opposite direction
- positive
- positive
- positive
2 papers more in this group
See all 6 papers →Claims are grouped by organism, treatment and what was measured or targeted. A paper counts as positive when any of its claims in the group is positive.