Abstract
The acclimation of photosynthesis and metabolism in response to water deficit is characterized using hydroponically grown potato plants (Solanum tuberosum cv. Désirée). Plants were subjected to a reduced water potential of the nutrient solution by adding 10% (w/v) PEG 6000. PEG-treated plants were retarded in growth. Leaves which had been fully developed before the PEG treatment and leaves grown during the PEG treatment showed different phenotypes and biochemical and physiological properties. Photosynthesis of all leaves decreased during the whole treatment. However, the decrease of photosynthesis in the two types of leaves had different causes indicated by differences in their metabolism. Leaves which were fully developed at the beginning of the PEG treatment began to wilt starting from the leaf rim. The apoplastic ABA content increased, coinciding with a decreased stomatal conductance. Increased energy charge of the cells indicated impaired chloroplastic metabolism, accompanied by a decrease of amounts of chloroplastic enzymes. The apoplastic and the symplastic ABA content were increased during water deficit and because ABA was concentrated in the cytosolic compartment it is suggested that ABA is involved in decreasing photosynthetic enzyme contents in old leaves. Young leaves, grown after the imposition of water deficit, were smaller than control leaves and had a curly surface. In young leaves apoplastic and cytosolic ABA contents were identical with control values. Carboxylation efficiency of photosynthesis was decreased, but the water use efficiency remained unchanged. Metabolic data of the photosynthetic pathways indicate a down-regulation of chloroplastic metabolism. It is concluded that in young leaves photosynthesis was non-stomatally limited. This limitation was not caused by ABA.
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Claims 15
Claim · model-written summary
PEG-treated potato plants had retarded growth.
- Taxon
- potato plants
Solanum tuberosumt0 - Treatment
- PEGe0
- Outcome
- growthe0
- Direction
- retardede0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“PEG-treated plants were retarded in growth.”
t0“potato plants”
Claim · model-written summary
Photosynthesis decreased in all potato leaves throughout PEG treatment.
- Taxon
- potato plantsSolanum tuberosumt0
- Treatment
- PEG treatmente1
- Outcome
- Photosynthesise0
- Direction
- decreasede0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Photosynthesis of all leaves decreased during the whole treatment.”
e1“Leaves which were fully developed at the beginning of the PEG treatment began to wilt starting from the leaf rim.”
t0“potato plants”
Claim · model-written summary
Older leaves wilted from the leaf rim during PEG treatment.
- Taxon
- potato plantsSolanum tuberosumt0
- Organ / stage
- Leaves which were fully developed at the beginning of the PEG treatmente0
- Outcome
- wilt starting from the leaf rime0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Leaves which were fully developed at the beginning of the PEG treatment began to wilt starting from the leaf rim.”
t0“potato plants”
Claim · model-written summary
Apoplastic ABA increased while stomatal conductance decreased in older leaves.
- Taxon
- potato plantsSolanum tuberosumt0
- Compound
- ABAe0
- Outcome
- stomatal conductancee0
- Direction
- decreasede0
Not reportedOrgan / stage
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“The apoplastic ABA content increased, coinciding with a decreased stomatal conductance.”
t0“potato plants”
Claim · model-written summary
Cellular energy charge increased in older leaves.
- Taxon
- potato plantsSolanum tuberosumt0
- Outcome
- energy charge of the cellse0
- Direction
- Increasede0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Increased energy charge of the cells indicated impaired chloroplastic metabolism”
t0“potato plants”
Claim · model-written summary
Chloroplastic enzyme amounts decreased in older leaves.
- Taxon
- potato plantsSolanum tuberosumt0
- Outcome
- amounts of chloroplastic enzymese0
- Direction
- decreasee0
Not reportedTreatmentComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“accompanied by a decrease of amounts of chloroplastic enzymes.”
t0“potato plants”
Claim · model-written summary
Apoplastic and symplastic ABA contents increased during water deficit.
- Taxon
- potato plantsSolanum tuberosumt0
- Treatment
- water deficite0
- Outcome
- apoplastic and the symplastic ABA contente0
- Direction
- increasede0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“The apoplastic and the symplastic ABA content were increased during water deficit”
t0“potato plants”
Claim · model-written summary
The authors suggest cytosolic ABA contributes to lower photosynthetic enzyme contents in old leaves.
- Taxon
- potato plantsSolanum tuberosumt0
- Organ / stage
- old leavese0
- Compound
- ABAe0
- Outcome
- photosynthetic enzyme contentse0
- Direction
- decreasinge0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“because ABA was concentrated in the cytosolic compartment it is suggested that ABA is involved in decreasing photosynthetic enzyme contents in old leaves.”
t0“potato plants”
Claim · model-written summary
Young leaves under water deficit were smaller than controls.
- Taxon
- potato plantsSolanum tuberosumt0
- Organ / stage
- Young leavese0
- Treatment
- water deficite0
- Outcome
- smallere0
- Direction
- smallere0
- Comparator
- control leavese0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Young leaves, grown after the imposition of water deficit, were smaller than control leaves and had a curly surface.”
t0“potato plants”
Claim · model-written summary
Young leaves under water deficit had a curly surface.
- Taxon
- potato plantsSolanum tuberosumt0
- Organ / stage
- Young leavese0
- Outcome
- curly surfacee0
Not reportedDirection
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Young leaves, grown after the imposition of water deficit, were smaller than control leaves and had a curly surface.”
t0“potato plants”
Claim · model-written summary
Young-leaf apoplastic and cytosolic ABA matched control values.
- Taxon
- potato plantsSolanum tuberosumt0
- Organ / stage
- young leavese0
- Treatment
- water deficite1
- Outcome
- apoplastic and cytosolic ABA contentse0
- Direction
- identicale0
- Comparator
- control valuese0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“In young leaves apoplastic and cytosolic ABA contents were identical with control values.”
e1“The apoplastic and the symplastic ABA content were increased during water deficit”
t0“potato plants”
Claim · model-written summary
Young-leaf photosynthetic carboxylation efficiency decreased.
- Taxon
- potato plantsSolanum tuberosumt0
- Treatment
- water deficite1
- Outcome
- Carboxylation efficiency of photosynthesise0
- Direction
- decreasede0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Carboxylation efficiency of photosynthesis was decreased”
e1“The apoplastic and the symplastic ABA content were increased during water deficit”
t0“potato plants”
Claim · model-written summary
Young-leaf water use efficiency remained unchanged.
- Taxon
- potato plantsSolanum tuberosumt0
- Treatment
- water deficite1
- Outcome
- water use efficiencye0
- Direction
- unchangede0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“the water use efficiency remained unchanged.”
e1“The apoplastic and the symplastic ABA content were increased during water deficit”
t0“potato plants”
Claim · model-written summary
Young leaves showed down-regulated chloroplastic metabolism.
- Taxon
- potato plantsSolanum tuberosumt0
- Outcome
- chloroplastic metabolisme0
- Direction
- down-regulatione0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Metabolic data of the photosynthetic pathways indicate a down-regulation of chloroplastic metabolism.”
t0“potato plants”
Claim · model-written summary
The authors conclude that photosynthesis in young leaves was limited non-stomatally and not by ABA.
- Taxon
- potato plantsSolanum tuberosumt0
- Organ / stage
- young leavese0
- Compound
- ABAe0
- Outcome
- photosynthesise0
- Qualifier
- non-stomatally limitede0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“It is concluded that in young leaves photosynthesis was non-stomatally limited. This limitation was not caused by ABA.”
t0“potato plants”
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