Abstract
The aim of this study was to evaluate the validity of some chlorophyll (Chl) a fluorescence parameters as early indicators of a particular abiotic stress and also to characterize the effect of different abiotic stresses [high light, NaCl, polyethylene glycol (PEG)-induced osmotic stress, and heavy metals] on the electron transport chain of rice (Oryza sativa L.) seedlings. The results clearly revealed that Chl a fluorescence parameters differ between abiotic stress types and also allowed us to select some parameters which were specifically and intensively affected under different abiotic stresses. We observed that the performance index is a common sensitive parameter to evaluate the effect of above four different abiotic stresses in rice seedlings. Certain Chl a fluorescence parameters were significant for a specific stress. The ratio between the rate constants of photochemical and nonphotochemical deactivation of excited Chl molecules (FV/F0) was prominently decreasing and the maximum quantum yield of nonphotochemical deexcitation was prominently increasing upon exposure to high light stress. The maximum quantum yield of electron transport and the electron transport from PSII donor side to PSII reaction center was highly reduced under NaCl stress in rice seedlings. Moreover, FV/F0 and PSII structure function index were prominently decreasing and the dissipation per cross section was significantly enhancing under PEG stress. The pool size of reduced plastoquinone on the reducing side of PSII [total complementary area between the fluorescence induction curve and maximal chlorophyll fluorescence (FM)], FM, and the probability by which electrons move from PSII to PSI acceptor side were significantly decreasing under heavy metal stress.
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Claims 12
Claim · model-written summary
Chlorophyll fluorescence parameters differed by abiotic stress type.
- Taxon
- rice
Oryza sativae1 - Outcome
- Chl a fluorescence parameters differ between abiotic stress typese0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Chl a fluorescence parameters differ between abiotic stress types”
e1“rice (Oryza sativa L.) seedlings”
Claim · model-written summary
Performance index was a sensitive indicator across four abiotic stresses.
- Taxon
- riceOryza sativae0
- Outcome
- performance indexe0
- Comparator
- four different abiotic stressese0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“the performance index is a common sensitive parameter to evaluate the effect of above four different abiotic stresses in rice seedlings.”
Claim · model-written summary
FV/F0 prominently decreased with high light.
- Taxon
- riceOryza sativae1
- Treatment
- high light stresse0
- Outcome
- FV/F0e0
- Direction
- decreasinge0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“The ratio between the rate constants of photochemical and nonphotochemical deactivation of excited Chl molecules (FV/F0) was prominently decreasing and the maximum quantum yield of nonphotochemical deexcitation was prominently increasing upon exposure to high light stress.”
e1“rice (Oryza sativa L.) seedlings”
Claim · model-written summary
Maximum quantum yield of nonphotochemical deexcitation increased under high light.
- Taxon
- riceOryza sativae1
- Treatment
- high light stresse0
- Outcome
- maximum quantum yield of nonphotochemical deexcitatione0
- Direction
- increasinge0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“the maximum quantum yield of nonphotochemical deexcitation was prominently increasing upon exposure to high light stress.”
e1“rice (Oryza sativa L.) seedlings”
Claim · model-written summary
Maximum quantum yield of electron transport was highly reduced under NaCl stress.
- Taxon
- riceOryza sativae0
- Treatment
- NaCl stresse0
- Outcome
- maximum quantum yield of electron transporte0
- Direction
- reducede0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“The maximum quantum yield of electron transport and the electron transport from PSII donor side to PSII reaction center was highly reduced under NaCl stress in rice seedlings.”
Claim · model-written summary
Electron transport from the PSII donor side to the reaction center was highly reduced under NaCl.
- Taxon
- riceOryza sativae0
- Treatment
- NaCl stresse0
- Outcome
- electron transport from PSII donor side to PSII reaction centere0
- Direction
- reducede0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“The maximum quantum yield of electron transport and the electron transport from PSII donor side to PSII reaction center was highly reduced under NaCl stress in rice seedlings.”
Claim · model-written summary
FV/F0 prominently decreased under PEG stress.
- Taxon
- riceOryza sativae1
- Treatment
- PEG stresse0
- Outcome
- FV/F0e0
- Direction
- decreasinge0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“FV/F0 and PSII structure function index were prominently decreasing and the dissipation per cross section was significantly enhancing under PEG stress.”
e1“rice (Oryza sativa L.) seedlings”
Claim · model-written summary
PSII structure function index prominently decreased under PEG stress.
- Taxon
- riceOryza sativae1
- Treatment
- PEG stresse0
- Outcome
- PSII structure function indexe0
- Direction
- decreasinge0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“FV/F0 and PSII structure function index were prominently decreasing and the dissipation per cross section was significantly enhancing under PEG stress.”
e1“rice (Oryza sativa L.) seedlings”
Claim · model-written summary
Dissipation per cross section significantly increased under PEG stress.
- Taxon
- riceOryza sativae1
- Treatment
- PEG stresse0
- Outcome
- dissipation per cross sectione0
- Direction
- enhancinge0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“the dissipation per cross section was significantly enhancing under PEG stress.”
e1“rice (Oryza sativa L.) seedlings”
Claim · model-written summary
Reduced plastoquinone pool size significantly decreased under heavy metal stress.
- Taxon
- riceOryza sativae1
- Treatment
- heavy metal stresse0
- Outcome
- pool size of reduced plastoquinonee0
- Direction
- decreasinge0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“The pool size of reduced plastoquinone on the reducing side of PSII [total complementary area between the fluorescence induction curve and maximal chlorophyll fluorescence (FM)], FM, and the probability by which electrons move from PSII to PSI acceptor side were significantly decreasing under heavy metal stress.”
e1“rice (Oryza sativa L.) seedlings”
Claim · model-written summary
Maximum chlorophyll fluorescence significantly decreased under heavy metal stress.
- Taxon
- riceOryza sativae1
- Treatment
- heavy metal stresse0
- Outcome
- FMe0
- Direction
- decreasinge0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“maximal chlorophyll fluorescence (FM)], FM, and the probability by which electrons move from PSII to PSI acceptor side were significantly decreasing under heavy metal stress.”
e1“rice (Oryza sativa L.) seedlings”
Claim · model-written summary
Probability of electron movement from PSII to PSI acceptor side significantly decreased under heavy metal stress.
- Taxon
- riceOryza sativae1
- Treatment
- heavy metal stresse0
- Outcome
- probability by which electrons move from PSII to PSI acceptor sidee0
- Direction
- decreasinge0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“the probability by which electrons move from PSII to PSI acceptor side were significantly decreasing under heavy metal stress.”
e1“rice (Oryza sativa L.) seedlings”
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