Abstract
Effects of water stress on photosynthesis, PS II photochemistry and photoinhibition were investigated in wheat plants ( Tritium aestivum L.). To separate water stress effects from photoinhibition, water stress was imposed at low irradiance (180 µmol m-2 s-1). When water stress developed gradually, net CO2 assimilation rate and leaf stomatal conductance decreased significantly. However, water stress had no effects on the PS II photochemistry in dark-adapted leaves. There were no significant changes in the maximal efficiency of PS II photochemistry and no apparent damages in PS II reaction centre, its oxidising and acceptor sides, or its antennae system. However, PS II photochemistry in light-adapted leaves was modified in water-stressed plants. This was shown by the decrease in the efficiency of excitation energy capture by open PS II reaction centres and the quantum yield of PS II electron transport and a significant increase in non-photochemical quenching. In addition, water stress increased the susceptibility to photoinhibition. The extent of photoinhibition became more pronounced as water stress increased. It was found that water-stressed plants exhibited a much greater accumulation of the Q B-non-reducing PS II reaction centres and a smaller increase in non- photochemical quenching during photoinhibition. Such changes might be responsible for the increased susceptibility to photoinhibition.
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Claims 11
Claim · model-written summary
Water stress significantly decreased net CO2 assimilation and leaf stomatal conductance.
- Taxon
- wheat plants
Triticum aestivumt0 - Treatment
- water stresse0
- Outcome
- net CO2 assimilation rate and leaf stomatal conductancee0
- Direction
- decreasede0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“When water stress developed gradually, net CO2 assimilation rate and leaf stomatal conductance decreased significantly.”
t0“wheat plants”
Claim · model-written summary
Water stress did not affect PS II photochemistry in dark-adapted leaves.
- Taxon
- wheat plantsTriticum aestivumt0
- Organ / stage
- dark-adapted leavese0
- Treatment
- water stresse0
- Outcome
- PS II photochemistrye0
- Direction
- no effectse0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“water stress had no effects on the PS II photochemistry in dark-adapted leaves”
t0“wheat plants”
Claim · model-written summary
Maximal PS II efficiency did not change significantly.
- Taxon
- wheat plantsTriticum aestivumt0
- Outcome
- maximal efficiency of PS II photochemistrye0
- Direction
- no significant changese0
Not reportedTreatmentComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“There were no significant changes in the maximal efficiency of PS II photochemistry”
t0“wheat plants”
Claim · model-written summary
No apparent damage occurred in PS II reaction centre or antenna systems.
- Taxon
- wheat plantsTriticum aestivumt0
- Outcome
- no apparent damages in PS II reaction centre, its oxidising and acceptor sides, or its antennae systeme0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“no apparent damages in PS II reaction centre, its oxidising and acceptor sides, or its antennae system”
t0“wheat plants”
Claim · model-written summary
Water stress decreased excitation capture efficiency and PS II electron transport quantum yield.
- Taxon
- wheat plantsTriticum aestivumt0
- Treatment
- water-stressede1
- Outcome
- efficiency of excitation energy capture by open PS II reaction centres and the quantum yield of PS II electron transporte0
- Direction
- decreasee0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“the decrease in the efficiency of excitation energy capture by open PS II reaction centres and the quantum yield of PS II electron transport”
t0“wheat plants”
e1“water-stressed plants exhibited a much greater accumulation”
Claim · model-written summary
Water stress significantly increased non-photochemical quenching.
- Taxon
- wheat plantsTriticum aestivumt0
- Treatment
- water-stressede1
- Outcome
- non-photochemical quenchinge0
- Direction
- increasee0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“a significant increase in non-photochemical quenching”
t0“wheat plants”
e1“water-stressed plants exhibited a much greater accumulation”
Claim · model-written summary
Water stress increased susceptibility to photoinhibition.
- Taxon
- wheat plantsTriticum aestivumt0
- Treatment
- water stresse0
- Outcome
- susceptibility to photoinhibitione0
- Direction
- increasede0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“water stress increased the susceptibility to photoinhibition”
t0“wheat plants”
Claim · model-written summary
Photoinhibition became more pronounced with increasing water stress.
- Taxon
- wheat plantsTriticum aestivumt0
- Treatment
- water stresse0
- Outcome
- extent of photoinhibitione0
- Direction
- more pronouncede0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“The extent of photoinhibition became more pronounced as water stress increased.”
t0“wheat plants”
Claim · model-written summary
Water-stressed plants accumulated more QB-non-reducing PS II centres during photoinhibition.
- Taxon
- wheat plantsTriticum aestivumt0
- Treatment
- water-stressede0
- Outcome
- accumulation of the Q B-non-reducing PS II reaction centrese0
- Direction
- much greatere0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“water-stressed plants exhibited a much greater accumulation of the Q B-non-reducing PS II reaction centres”
t0“wheat plants”
Claim · model-written summary
Water-stressed plants had a smaller rise in non-photochemical quenching during photoinhibition.
- Taxon
- wheat plantsTriticum aestivumt0
- Treatment
- water-stressede1
- Outcome
- non- photochemical quenchinge0
- Direction
- smaller increasee0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“a smaller increase in non- photochemical quenching during photoinhibition”
t0“wheat plants”
e1“water-stressed plants exhibited a much greater accumulation”
Claim · model-written summary
The altered PS II responses might explain increased susceptibility to photoinhibition.
- Taxon
- wheat plantsTriticum aestivumt0
- Outcome
- increased susceptibility to photoinhibitione0
- Qualifier
- Such changese0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Such changes might be responsible for the increased susceptibility to photoinhibition.”
t0“wheat plants”
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See all 246 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.