Abstract
The effects of phosphorus deficiency on the photosynthetic characteristics were studied in rice seedlings (Oryza sativa L.) every 8 days after treatment. P deficiency caused a significant reduction in the net photosynthesis rate (P N) in rice plants. During the first 16 days of P deficiency, the maximum efficiency of PSII photochemistry (F v/F m), the effective PSII quantum yield (ϕPSII), the electron transport rate (ETR) as well as photochemical quenching (qP) in the P-limited rice plants kept close to the control, but the excitation energy capture efficiency of PSII reaction centers (F′v/F′m) was significantly declined in the P-deficient rice leaves. Meanwhile, in the stressed leaves, we also found a significant increase in nonphotochemical quenching (NPQ) as well as in the activities of superoxide dismutase (SOD) and ascorbate peroxidase (APX). It was indicated that a series of photoprotective mechanisms had been initiated in rice plants in response to short-term P deficiency. Therefore, PSII functioning was not affected significantly under such stress. As P deficiency continued, the excess excitation energy was accumulated in excess of the capacity of photoprotection systems. When the rice suffered from P deficiency more than 16 days, ϕPSII, ETR, and qP were decreased more rapidly than that in the control plants, although NPQ still kept higher in the stressed plants. These results were also consistent with the data on the distribution of excitation energy. The excess energy induced the generation of reactive oxygen species, which might lead to the further damage to PSII functioning.
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Claims 8
Claim · model-written summary
Phosphorus deficiency significantly reduced rice net photosynthesis.
- Taxon
- rice plants
Oryza sativae0 - Treatment
- P deficiencye0
- Outcome
- net photosynthesis rate (P N)e0
- Direction
- reductione0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“P deficiency caused a significant reduction in the net photosynthesis rate (P N) in rice plants.”
Claim · model-written summary
During the first 16 days, Fv/Fm, PSII yield, ETR, and qP remained close to control.
- Taxon
- rice plantsOryza sativae0
- Treatment
- P deficiencye0
- Outcome
- maximum efficiency of PSII photochemistry (F v/F m), the effective PSII quantum yield (ϕPSII), the electron transport rate (ETR) as well as photochemical quenching (qP)e0
- Direction
- kept closee0
- Qualifier
- first 16 dayse0
- Comparator
- controle0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“During the first 16 days of P deficiency, the maximum efficiency of PSII photochemistry (F v/F m), the effective PSII quantum yield (ϕPSII), the electron transport rate (ETR) as well as photochemical quenching (qP) in the P-limited rice plants kept close to the control”
Claim · model-written summary
Fv prime/Fm prime declined significantly in phosphorus deficient leaves.
- Taxon
- riceOryza sativae0
- Treatment
- P-deficiente0
- Outcome
- excitation energy capture efficiency of PSII reaction centers (F′v/F′m)e0
- Direction
- declinede0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“the excitation energy capture efficiency of PSII reaction centers (F′v/F′m) was significantly declined in the P-deficient rice leaves.”
Claim · model-written summary
NPQ increased significantly in stressed rice leaves.
- Taxon
- rice plantsOryza sativae1
- Treatment
- stressede0
- Outcome
- nonphotochemical quenching (NPQ)e0
- Direction
- increasee0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“in the stressed leaves, we also found a significant increase in nonphotochemical quenching (NPQ)”
e1“net photosynthesis rate (P N) in rice plants.”
Claim · model-written summary
SOD and APX activities increased significantly in stressed rice leaves.
- Taxon
- rice plantsOryza sativae1
- Gene
- superoxide dismutase (SOD) and ascorbate peroxidase (APX)e0
- Outcome
- activities of superoxide dismutase (SOD) and ascorbate peroxidase (APX)e0
- Direction
- increasee0
Not reportedTreatmentComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“a significant increase in nonphotochemical quenching (NPQ) as well as in the activities of superoxide dismutase (SOD) and ascorbate peroxidase (APX).”
e1“net photosynthesis rate (P N) in rice plants.”
Claim · model-written summary
After more than 16 days of phosphorus deficiency, PSII yield, ETR, and qP declined faster than control.
- Taxon
- riceOryza sativae0
- Treatment
- P deficiencye0
- Outcome
- ϕPSII, ETR, and qPe0
- Direction
- decreasede0
- Qualifier
- more than 16 dayse0
- Comparator
- control plantse0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“When the rice suffered from P deficiency more than 16 days, ϕPSII, ETR, and qP were decreased more rapidly than that in the control plants”
Claim · model-written summary
NPQ remained higher after more than 16 days in stressed plants.
- Taxon
- riceOryza sativae1
- Treatment
- P deficiencye1
- Outcome
- NPQe0
- Direction
- highere0
- Qualifier
- more than 16 dayse1
- Comparator
- control plantse1
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“although NPQ still kept higher in the stressed plants.”
e1“When the rice suffered from P deficiency more than 16 days, ϕPSII, ETR, and qP were decreased more rapidly than that in the control plants, although NPQ still kept higher in the stressed plants.”
Claim · model-written summary
The authors infer that excess excitation energy may generate reactive oxygen species and damage PSII.
- Taxon
- rice plantsOryza sativae1
- Compound
- reactive oxygen speciese0
- Outcome
- further damage to PSII functioninge0
- Qualifier
- excess energye0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“The excess energy induced the generation of reactive oxygen species, which might lead to the further damage to PSII functioning.”
e1“net photosynthesis rate (P N) in rice plants.”
The same questions in other papers
phosphorus · physiology: photosynthesis · Oryza sativa (rice)Positive and negative results
11 papers in the same direction as this paper · 3 in the opposite direction
This paper is about lacking the nutrient, so it counts the other way round here.
- negative
- positive
- positive
11 papers more in this group
See all 15 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.