Abstract
Summary Carbon reserve use is a major drought response in trees, enabling tree survival in conditions prohibiting photosynthesis. However, regulation of starch metabolism under drought at the whole‐tree scale is still poorly understood. To this end, we combined measurements of nonstructural carbohydrates (NSCs), tree physiology and gene expression. The experiment was conducted outside on olive trees in pots under 90 d of seasonal spring to summer warming. Half of the trees were also subjected to limited water conditions for 28 d. Photosynthesis decreased in dehydrating trees from 19 to 0.5 µmol m −2 s −1 during the drought period. Starch degradation and mannitol production were a major drought response, with mannitol increasing to 71% and 41% out of total NSCs in shoots and roots, respectively. We identified the gene family members potentially relevant either to long‐term or stress‐induced carbon storage. Partitioning of expression patterns among β amylase and starch synthase family members was observed, with three β amylases possibly facilitating the rapid starch degradation under heat and drought. Our results suggest a group of stress‐related, starch metabolism genes, correlated with NSC fluctuations during drought and recovery. The daily starch metabolism gene expression was different from the stress‐mode starch metabolism pattern, where some genes are uniquely expressed during the stress‐mode response.
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Claims 9
Claim · model-written summary
Photosynthesis fell from 19 to 0.5 µmol m −2 s −1 during dehydration.
- Taxon
- olive trees
Olea europaeat0 - Treatment
- droughte0
- Outcome
- Photosynthesise0
- Direction
- decreasede0
- Value
- 19 to 0.5 µmol m −2 s −1e0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Photosynthesis decreased in dehydrating trees from 19 to 0.5 µmol m −2 s −1 during the drought period.”
t0“olive trees”
Claim · model-written summary
Starch degradation was a major drought response.
- Taxon
- olive treesOlea europaeat0
- Treatment
- droughte0
- Outcome
- Starch degradatione0
Not reportedDirection
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Starch degradation and mannitol production were a major drought response, with mannitol increasing to 71% and 41% out of total NSCs in shoots and roots, respectively.”
t0“olive trees”
Claim · model-written summary
Shoot mannitol increased to 71% of nonstructural carbohydrates under drought.
- Taxon
- olive treesOlea europaeat0
- Organ / stage
- shootse0
- Treatment
- droughte0
- Outcome
- mannitole0
- Direction
- increasinge0
- Value
- 71%e0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Starch degradation and mannitol production were a major drought response, with mannitol increasing to 71% and 41% out of total NSCs in shoots and roots, respectively.”
t0“olive trees”
Claim · model-written summary
Root mannitol increased to 41% of nonstructural carbohydrates under drought.
- Taxon
- olive treesOlea europaeat0
- Organ / stage
- rootse0
- Treatment
- droughte0
- Outcome
- mannitole0
- Direction
- increasinge0
- Value
- 41%e0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Starch degradation and mannitol production were a major drought response, with mannitol increasing to 71% and 41% out of total NSCs in shoots and roots, respectively.”
t0“olive trees”
Claim · model-written summary
Gene family members potentially relevant to long-term or stress-induced carbon storage were identified.
- Taxon
- olive treesOlea europaeat0
- Outcome
- gene family members potentially relevant either to long‐term or stress‐induced carbon storagee0
Not reportedDirection
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“We identified the gene family members potentially relevant either to long‐term or stress‐induced carbon storage.”
t0“olive trees”
Claim · model-written summary
Expression patterns partitioned among beta amylase and starch synthase family members.
- Taxon
- olive treesOlea europaeat0
- Gene
- β amylase and starch synthase family memberse0
- Outcome
- Partitioning of expression patternse0
Not reportedDirection
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Partitioning of expression patterns among β amylase and starch synthase family members was observed, with three β amylases possibly facilitating the rapid starch degradation under heat and drought.”
t0“olive trees”
Claim · model-written summary
Three beta amylases may facilitate rapid starch degradation under heat and drought.
- Taxon
- olive treesOlea europaeat0
- Treatment
- heat and droughte0
- Gene
- β amylasese0
- Outcome
- rapid starch degradatione0
Not reportedDirection
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“three β amylases possibly facilitating the rapid starch degradation under heat and drought.”
t0“olive trees”
Claim · model-written summary
Stress-related starch metabolism genes correlated with NSC fluctuations during drought and recovery.
- Taxon
- olive treesOlea europaeat0
- Gene
- starch metabolism genese0
- Outcome
- NSC fluctuationse0
- Qualifier
- during drought and recoverye0
Not reportedDirection
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Our results suggest a group of stress‐related, starch metabolism genes, correlated with NSC fluctuations during drought and recovery.”
t0“olive trees”
Claim · model-written summary
Daily starch metabolism gene expression differed from stress-mode expression, including genes unique to stress response.
- Taxon
- olive treesOlea europaeat0
- Gene
- starch metabolism genee0
- Outcome
- expressione0
- Direction
- differente0
- Comparator
- stress‐mode starch metabolism patterne0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“The daily starch metabolism gene expression was different from the stress‐mode starch metabolism pattern, where some genes are uniquely expressed during the stress‐mode response.”
t0“olive trees”
The same questions in other papers
drought · physiology: photosynthesis · Olea europaea (common olive)Results differ
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- negative
- negative
- no effect
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- negative
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See all 8 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.