Abstract
Isoprene emissions were studied in one-year old sweetgum (Liquidambar styraciflua L.) seedlings during nine drying-rewatering cycles extending over five months. Each drying cycle lasted to the point of leaf wilting. Growth was essentially stopped in response to the first drying cycle, though seedling survival and capacity to recover turgor on rewatering remained high throughout the entire nine cycles. Photosynthetic rates of leaves were inhibited by the drying treatments. Under severe drought, isoprene emission rates of leaves were also inhibited, though isoprene emission was generally less sensitive to drought than photosynthesis. The lower drought sensitivity of isoprene emission compared with photosynthesis resulted in a higher percentage of fixed carbon lost as isoprene as seedlings became more stressed. During the recovery phase of the drying-rewatering cycles, isoprene emission rates in several seedlings were higher than in well-watered control seedlings. Following the ninth drying-rewatering cycle, sustained daily watering resulted in recovery of isoprene emission rates to control values within four days. Photosynthetic rates only recovered to 50% of control values after seven days. We conclude that the mechanisms regulating photosynthetic rate and isoprene emission rate are differentially influenced by limited water supplies. The results are consistent with past studies that predict a protective role for isoprene emission during stress, particularly protection from excessive leaf temperatures during drought.
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Claims 11
Claim · model-written summary
Growth of sweetgum seedlings essentially stopped in response to the first drying cycle.
- Taxon
- sweetgum
Liquidambar styracifluat0 - Treatment
- first drying cyclee0
- Outcome
- Growthe0
- Direction
- stoppede0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
t0“sweetgum (Liquidambar styraciflua) seedlings”
e0“Growth was essentially stopped in response to the first drying cycle, though seedling survival and capacity to recover turgor on rewatering remained high throughout the entire nine cycles”
Claim · model-written summary
Seedling survival and capacity to recover turgor on rewatering remained high through all nine drying cycles.
- Taxon
- sweetgumLiquidambar styracifluat0
- Outcome
- seedling survival and capacity to recover turgor on rewateringe0
- Qualifier
- throughout the entire nine cyclese0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
t0“sweetgum (Liquidambar styraciflua) seedlings”
e0“Growth was essentially stopped in response to the first drying cycle, though seedling survival and capacity to recover turgor on rewatering remained high throughout the entire nine cycles”
Claim · model-written summary
Photosynthetic rates of leaves were inhibited by the drying treatments.
- Taxon
- sweetgumLiquidambar styracifluat0
- Treatment
- drying treatmentse1
- Outcome
- Photosynthetic rates of leavese1
- Direction
- inhibitede1
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
t0“sweetgum (Liquidambar styraciflua) seedlings”
e1“Photosynthetic rates of leaves were inhibited by the drying treatments. Under severe drought, isoprene emission rates of leaves were also inhibited”
Claim · model-written summary
Under severe drought, isoprene emission rates of leaves were inhibited.
- Taxon
- sweetgumLiquidambar styracifluat0
- Treatment
- severe droughte1
- Outcome
- isoprene emission rates of leavese1
- Direction
- inhibitede1
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
t0“sweetgum (Liquidambar styraciflua) seedlings”
e1“Photosynthetic rates of leaves were inhibited by the drying treatments. Under severe drought, isoprene emission rates of leaves were also inhibited”
Claim · model-written summary
Isoprene emission was generally less sensitive to drought than photosynthesis.
- Taxon
- sweetgumLiquidambar styracifluat0
- Treatment
- droughte2
- Outcome
- isoprene emissione2
- Direction
- less sensitivee2
- Comparator
- photosynthesise2
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
t0“sweetgum (Liquidambar styraciflua) seedlings”
e2“isoprene emission was generally less sensitive to drought than photosynthesis”
Claim · model-written summary
The lower drought sensitivity of isoprene emission left a higher percentage of fixed carbon lost as isoprene as seedlings became more stressed.
- Taxon
- sweetgumLiquidambar styracifluat0
- Treatment
- seedlings became more stressede3
- Outcome
- percentage of fixed carbon lost as isoprenee3
- Direction
- highere3
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
t0“sweetgum (Liquidambar styraciflua) seedlings”
e3“The lower drought sensitivity of isoprene emission compared with photosynthesis resulted in a higher percentage of fixed carbon lost as isoprene as seedlings became more stressed”
Claim · model-written summary
During recovery from drying-rewatering cycles, isoprene emission rates in several seedlings were higher than in well-watered controls.
- Taxon
- sweetgumLiquidambar styracifluat0
- Treatment
- drying-rewatering cyclese4
- Outcome
- isoprene emission ratese4
- Direction
- highere4
- Qualifier
- in several seedlingse4
- Comparator
- well-watered control seedlingse4
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
t0“sweetgum (Liquidambar styraciflua) seedlings”
e4“During the recovery phase of the drying-rewatering cycles, isoprene emission rates in several seedlings were higher than in well-watered control seedlings”
Claim · model-written summary
After the ninth drying-rewatering cycle, sustained daily watering recovered isoprene emission rates to control values within four days.
- Taxon
- sweetgumLiquidambar styracifluat0
- Treatment
- sustained daily wateringe5
- Outcome
- recovery of isoprene emission ratese5
- Value
- within four dayse5
- Comparator
- control valuese5
Not reportedDirection
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
t0“sweetgum (Liquidambar styraciflua) seedlings”
e5“Following the ninth drying-rewatering cycle, sustained daily watering resulted in recovery of isoprene emission rates to control values within four days. Photosynthetic rates only recovered to 50% of control values after seven days”
Claim · model-written summary
Photosynthetic rates recovered only to 50% of control values after seven days of sustained daily watering.
- Taxon
- sweetgumLiquidambar styracifluat0
- Treatment
- sustained daily wateringe5
- Outcome
- Photosynthetic ratese5
- Value
- 50%e5
- Qualifier
- after seven dayse5
- Comparator
- control valuese5
Not reportedDirection
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
t0“sweetgum (Liquidambar styraciflua) seedlings”
e5“Following the ninth drying-rewatering cycle, sustained daily watering resulted in recovery of isoprene emission rates to control values within four days. Photosynthetic rates only recovered to 50% of control values after seven days”
Claim · model-written summary
Photosynthetic rate and isoprene emission rate are differentially influenced by limited water supplies.
- Taxon
- sweetgumLiquidambar styracifluat0
- Treatment
- limited water suppliese6
- Outcome
- photosynthetic rate and isoprene emission ratee6
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
t0“sweetgum (Liquidambar styraciflua) seedlings”
e6“We conclude that the mechanisms regulating photosynthetic rate and isoprene emission rate are differentially influenced by limited water supplies”
Claim · model-written summary
Isoprene emission may have a protective role against excessive leaf temperatures during drought.
- Taxon
- sweetgumLiquidambar styracifluat0
- Outcome
- protective role for isoprene emissione7
- Qualifier
- protection from excessive leaf temperatures during droughte7
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
t0“sweetgum (Liquidambar styraciflua) seedlings”
e7“The results are consistent with past studies that predict a protective role for isoprene emission during stress, particularly protection from excessive leaf temperatures during drought”
The same questions in other papers
irrigation · physiology: photosynthesis · Liquidambar styraciflua (sweet gum)Positive and negative results
1 in the opposite direction
- positive
processing · physiology: photosynthesis · Liquidambar styraciflua (sweet gum)Positive and negative results
1 in the opposite direction
- positive
drought · environment: emissions · Liquidambar styraciflua (sweet gum)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.