Abstract
Photoprotection mechanisms of rice plants were studied when its seedlings were subjected to the combined stress of water and high light. The imposition of water stress, induced by PEG 6000 which was applied to roots, resulted in substantial inhibition of stomatal conductance and net photosynthesis under all irradiance treatments. Under high light stress, the rapid decline of photosynthesis with the development of water stress was accompanied by decreases in the maximum velocity of RuBP carboxylation by Rubisco (V(cmax)), the capacity for ribulose-1,5-bisphosphate regeneration (J(max)), Rubisco and stromal FBPase activities, and the quantum efficiency of photosystem II, in the absence of any stomatal limitation of CO(2) supply. Water stress significantly reduced the energy flux via linear electron transport (J(PSII)), but increased light-dependent and DeltapH- and xanthophyll-mediated thermal dissipation (J(NPQ)). It is concluded that the drought-induced inhibition of photosynthesis under different irradiances in the rice was due to both diffusive and metabolic limitations. Metabolic limitation of photosynthesis may be related to the adverse effects of some metabolic processes and the oxidative damage to the chloroplast. Meanwhile, an enhanced thermal dissipation is an important process to minimize the adverse effects of drought and high irradiance when CO(2) assimilation is suppressed.
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Claims 4
Claim · model-written summary
Water stress inhibited stomatal conductance and net photosynthesis under all irradiance treatments.
- Taxon
- rice
Oryza sativae1 - Treatment
- water stresse0
- Outcome
- stomatal conductance and net photosynthesise0
- Direction
- inhibitione0
- Qualifier
- under all irradiance treatmentse0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“The imposition of water stress, induced by PEG 6000 which was applied to roots, resulted in substantial inhibition of stomatal conductance and net photosynthesis under all irradiance treatments.”
e1“rice plants”
Claim · model-written summary
Under high light, developing water stress reduced Rubisco carboxylation capacity, RuBP regeneration capacity, Rubisco and FBPase activities, and PSII efficiency.
- Taxon
- riceOryza sativae1
- Treatment
- water stresse0
- Outcome
- the maximum velocity of RuBP carboxylation by Rubisco (V(cmax)), the capacity for ribulose-1,5-bisphosphate regeneration (J(max)), Rubisco and stromal FBPase activities, and the quantum efficiency of photosystem IIe0
- Direction
- decreasese0
- Qualifier
- Under high light stresse0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Under high light stress, the rapid decline of photosynthesis with the development of water stress was accompanied by decreases in the maximum velocity of RuBP carboxylation by Rubisco (V(cmax)), the capacity for ribulose-1,5-bisphosphate regeneration (J(max)), Rubisco and stromal FBPase activities, and the quantum efficiency of photosystem II”
e1“rice plants”
Claim · model-written summary
Water stress reduced linear electron transport energy flux.
- Taxon
- riceOryza sativae1
- Treatment
- Water stresse0
- Outcome
- energy flux via linear electron transport (J(PSII))e0
- Direction
- reducede0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Water stress significantly reduced the energy flux via linear electron transport (J(PSII))”
e1“rice plants”
Claim · model-written summary
Water stress increased thermal dissipation.
- Taxon
- riceOryza sativae1
- Treatment
- Water stresse0
- Outcome
- light-dependent and DeltapH- and xanthophyll-mediated thermal dissipation (J(NPQ))e0
- Direction
- increasede0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Water stress significantly reduced the energy flux via linear electron transport (J(PSII)), but increased light-dependent and DeltapH- and xanthophyll-mediated thermal dissipation (J(NPQ))”
e1“rice plants”
The same questions in other papers
drought · physiology: photosynthesis · Oryza sativa (rice)Positive and negative results
77 papers in the same direction as this paper · 18 in the opposite direction
- negative
- negative
- negative
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See all 96 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.