Abstract
Abstract Oxidative stress from ozone (O 3 ) causes plants to alter their emission of biogenic volatile organic compounds (BVOC) and their photosynthetic rate. Stress reactions from O 3 on birch trees can result in prohibited plant growth and lead to increased BVOC emission rates as well as changes in their compound blend to emit more monoterpenes (MT) and sesquiterpenes (SQT). BVOCs take part in atmospheric reactions such as enhancing the production of secondary organic aerosols (SOA). As the compound blend and emission rate change with O 3 stress, this can influence the atmospheric conditions by affecting the production of SOA. Studying the stress responses of plants provides important information on how these reactions might change, which is vital to making better predictions of the future climate. In this study, measurements were taken to find out how the leaves of mature mountain birch trees ( Betula pubescens ssp. czerepanovii ) respond to different levels of elevated O 3 exposure in situ depending on leaf age. We found that leaves from both early and late summers responded with induced SQT emission after exposure to 120 ppb O 3 . Early leaves were, however, more sensitive to increased O 3 concentrations, with enhanced emission of green leaf volatiles (GLV) and tendencies of both induced leaf senescence as well as poor recovery in the photosynthetic rate between exposures. Late leaves had more stable photosynthetic rates throughout the experiment and responded less to exposure at different O 3 levels.
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Claims 5
Claim · model-written summary
Both early and late summer birch leaves induced sesquiterpene emission after 120 ppb ozone.
- Taxon
- mountain birch
Betula pubescens var. pumilat0 - Organ / stage
- leavese0
- Treatment
- exposure to 120 ppb O 3e0
- Outcome
- SQT emissione0
- Direction
- inducede0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“leaves from both early and late summers responded with induced SQT emission after exposure to 120 ppb O 3”
t0“mountain birch (Betula pubescens spp. czerepanovii)”
Claim · model-written summary
Early leaves showed enhanced green leaf volatile emission at increased ozone concentrations.
- Taxon
- mountain birchBetula pubescens var. pumilat0
- Organ / stage
- Early leavese0
- Treatment
- increased O 3 concentrationse0
- Outcome
- emission of green leaf volatiles (GLV)e0
- Direction
- enhancede0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Early leaves were, however, more sensitive to increased O 3 concentrations, with enhanced emission of green leaf volatiles (GLV)”
t0“mountain birch (Betula pubescens spp. czerepanovii)”
Claim · model-written summary
Early leaves tended toward induced senescence under increased ozone.
- Taxon
- mountain birchBetula pubescens var. pumilat0
- Organ / stage
- Early leavese0
- Treatment
- increased O 3 concentrationse0
- Outcome
- leaf senescencee0
- Direction
- inducede0
- Qualifier
- tendenciese0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Early leaves were, however, more sensitive to increased O 3 concentrations, with enhanced emission of green leaf volatiles (GLV) and tendencies of both induced leaf senescence as well as poor recovery in the photosynthetic rate between exposures”
t0“mountain birch (Betula pubescens spp. czerepanovii)”
Claim · model-written summary
Early leaves tended to recover poorly in photosynthetic rate between ozone exposures.
- Taxon
- mountain birchBetula pubescens var. pumilat0
- Organ / stage
- Early leavese0
- Treatment
- increased O 3 concentrationse0
- Outcome
- recovery in the photosynthetic ratee0
- Direction
- poore0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Early leaves were, however, more sensitive to increased O 3 concentrations, with enhanced emission of green leaf volatiles (GLV) and tendencies of both induced leaf senescence as well as poor recovery in the photosynthetic rate between exposures”
t0“mountain birch (Betula pubescens spp. czerepanovii)”
Claim · model-written summary
Late leaves had more stable photosynthetic rates and responded less to differing ozone levels.
- Taxon
- mountain birchBetula pubescens var. pumilat0
- Organ / stage
- Late leavese0
- Outcome
- photosynthetic ratese0
- Direction
- more stablee0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Late leaves had more stable photosynthetic rates throughout the experiment and responded less to exposure at different O 3 levels”
t0“mountain birch (Betula pubescens spp. czerepanovii)”
The same questions in other papers
ozone · quality: postharvest · Betula pubescens (downy birch)Results agree
1 paper in the same direction as this paper
- negative
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.