Abstract
The effects of short-term osmotic stress [a polyethylene glycol (PEG) treatment] on photosystem II (PS II) of upland and lowland rice seedlings were investigated using chlorophyll (Chl) fluorescence imaging. Spatial heterogeneity in the top fully expanded leaf for all Chl fluorescence parameters was found under stress conditions. After exposure to PEG, a decrease in the effective quantum yield of PS II photochemistry (φPS II) and photochemical quenching (qP), and an increase in non-photochemical quenching (NPQ) proceeded from the upper section to the base of the leaf. The most sensitive position in the leaf was different between the two ecotypes. Chl fluorescence parameters, net photosynthetic rates (PN), and stomatal conductance (gs) were more sensitive to the PEG stress in upland rice than in lowland rice. These results also indicate different leaf anatomy and development in the two rice ecotypes. Additionally, the findings suggest a more rapid stress response in upland rice.
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Claims 7
Claim · model-written summary
PEG stress decreased the effective quantum yield of PS II and photochemical quenching in rice leaves, progressing from the upper section to the base.
- Taxon
- Rice
Oryza sativat0 - Organ / stage
- leafe1
- Treatment
- PEGe1
- Outcome
- effective quantum yield of PS II photochemistry (φPS II) and photochemical quenching (qP)e1
- Direction
- decreasee1
- Qualifier
- proceeded from the upper section to the base of the leafe1
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
t0“Rice”
e1“After exposure to PEG, a decrease in the effective quantum yield of PS II photochemistry (φPS II) and photochemical quenching (qP), and an increase in non-photochemical quenching (NPQ) proceeded from the upper section to the base of the leaf”
Claim · model-written summary
PEG stress increased non-photochemical quenching in rice leaves.
- Taxon
- RiceOryza sativat0
- Treatment
- PEGe1
- Outcome
- non-photochemical quenching (NPQ)e1
- Direction
- increasee1
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
t0“Rice”
e1“After exposure to PEG, a decrease in the effective quantum yield of PS II photochemistry (φPS II) and photochemical quenching (qP), and an increase in non-photochemical quenching (NPQ) proceeded from the upper section to the base of the leaf”
Claim · model-written summary
Chlorophyll fluorescence parameters were spatially heterogeneous in the top fully expanded rice leaf under stress.
- Taxon
- RiceOryza sativat0
- Organ / stage
- top fully expanded leafe3
- Outcome
- Spatial heterogeneitye3
- Qualifier
- under stress conditionse3
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
t0“Rice”
e3“Spatial heterogeneity in the top fully expanded leaf for all Chl fluorescence parameters was found under stress conditions”
Claim · model-written summary
The most sensitive position in the rice leaf differed between the upland and lowland ecotypes.
- Taxon
- RiceOryza sativat0
- Material
- two ecotypese4
- Outcome
- most sensitive position in the leafe4
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
t0“Rice”
e4“The most sensitive position in the leaf was different between the two ecotypes”
Claim · model-written summary
Chlorophyll fluorescence parameters, PN and gs were more sensitive to PEG stress in upland rice than in lowland rice.
- Taxon
- RiceOryza sativat0
- Material
- upland ricee5
- Treatment
- PEG stresse5
- Outcome
- Chl fluorescence parameters, net photosynthetic rates (PN), and stomatal conductance (gs)e5
- Direction
- more sensitivee5
- Comparator
- lowland ricee5
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
t0“Rice”
e5“Chl fluorescence parameters, net photosynthetic rates (PN), and stomatal conductance (gs) were more sensitive to the PEG stress in upland rice than in lowland rice”
Claim · model-written summary
Upland rice showed a more rapid stress response than lowland rice.
- Taxon
- RiceOryza sativat0
- Material
- upland ricee7
- Outcome
- stress responsee7
- Qualifier
- more rapide7
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
t0“Rice”
e7“the findings suggest a more rapid stress response in upland rice”
Claim · model-written summary
The two rice ecotypes indicate different leaf anatomy and development.
- Taxon
- RiceOryza sativat0
- Material
- two rice ecotypese6
- Outcome
- leaf anatomy and developmente6
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
t0“Rice”
e6“These results also indicate different leaf anatomy and development in the two rice ecotypes”
The same questions in other papers
poly(ethylene glycol) · physiology: photosynthesis · Oryza sativa (rice)Results agree
3 papers in the same direction as this paper
- negative
- negative
- 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.