Abstract
The response of barley (Hordeum vulgare L. cv. Akcent) to various photosynthetic photon flux densities (PPFDs) and elevated [CO2] [700 μmol (CO2) mol-1; EC] was studied by gas exchange, chlorophyll (Chl) a fluorescence, and pigment analysis. In comparison with barley grown under ambient [CO2] [350 μmol (CO2) mol-1; AC] the EC acclimation resulted in a decrease in photosynthetic capacity, reduced stomatal conductance, and decreased total Chl content. The extent of acclimation depression of photosynthesis, the most pronounced for the plants grown at 730 μmol m-2 s-1 (PPFD730), may be related to the degree of sink-limitation. The increased non-radiative dissipation of absorbed photon energy for all EC plants corresponded to the higher de-epoxidation state of xanthophylls only for PPFD730 barley. Further, a pronounced decrease in photosystem 2 (PS2) photochemical efficiency (given as FV/FM) for EC plants grown at 730 and 1 200 μmol m-2 s-1 in comparison with AC barley was related to the reduced epoxidation of antheraxanthin and zeaxanthin back to violaxanthin in darkness. Thus the EC conditions sensitise the photosynthetic apparatus of high-irradiance acclimated barley plants (particularly PPFD730) to the photoinactivation of PS2.
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Claims 9
Claim · model-written summary
Elevated CO2 acclimation decreased the photosynthetic capacity of barley compared with ambient CO2.
- Taxon
- barley
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Hordeum vulgaree0 - Material
- Akcente0
- Treatment
- elevated [CO2] [700 μmol (CO2) mol-1; EC]e2
- Outcome
- photosynthetic capacitye1
- Direction
- decreasee1
- Comparator
- ambient [CO2] [350 μmol (CO2) mol-1; AC]e1
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
.jpg?width=500)
Verbatim
e0“barley (Hordeum vulgare L. cv. Akcent)”
e2“elevated [CO2] [700 μmol (CO2) mol-1; EC]”
e1“In comparison with barley grown under ambient [CO2] [350 μmol (CO2) mol-1; AC] the EC acclimation resulted in a decrease in photosynthetic capacity, reduced stomatal conductance, and decreased total Chl content”
Claim · model-written summary
Elevated CO2 acclimation reduced stomatal conductance in barley compared with ambient CO2.
- Taxon
- barleyHordeum vulgaree0
- Treatment
- elevated [CO2] [700 μmol (CO2) mol-1; EC]e2
- Outcome
- stomatal conductancee1
- Direction
- reducede1
- Comparator
- ambient [CO2] [350 μmol (CO2) mol-1; AC]e1
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“barley (Hordeum vulgare L. cv. Akcent)”
e2“elevated [CO2] [700 μmol (CO2) mol-1; EC]”
e1“In comparison with barley grown under ambient [CO2] [350 μmol (CO2) mol-1; AC] the EC acclimation resulted in a decrease in photosynthetic capacity, reduced stomatal conductance, and decreased total Chl content”
Claim · model-written summary
Elevated CO2 acclimation decreased total chlorophyll content in barley compared with ambient CO2.
- Taxon
- barleyHordeum vulgaree0
- Treatment
- elevated [CO2] [700 μmol (CO2) mol-1; EC]e2
- Outcome
- total Chl contente1
- Direction
- decreasede1
- Comparator
- ambient [CO2] [350 μmol (CO2) mol-1; AC]e1
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“barley (Hordeum vulgare L. cv. Akcent)”
e2“elevated [CO2] [700 μmol (CO2) mol-1; EC]”
e1“In comparison with barley grown under ambient [CO2] [350 μmol (CO2) mol-1; AC] the EC acclimation resulted in a decrease in photosynthetic capacity, reduced stomatal conductance, and decreased total Chl content”
Claim · model-written summary
The depression of photosynthesis under elevated CO2 may be related to the degree of sink-limitation in barley.
- Taxon
- barleyHordeum vulgaree0
- Outcome
- depression of photosynthesise3
- Qualifier
- degree of sink-limitatione3
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“barley (Hordeum vulgare L. cv. Akcent)”
e3“The extent of acclimation depression of photosynthesis, the most pronounced for the plants grown at 730 μmol m-2 s-1 (PPFD730), may be related to the degree of sink-limitation”
Claim · model-written summary
Elevated CO2 increased non-radiative dissipation of absorbed photon energy in barley.
- Taxon
- barleyHordeum vulgaree0
- Treatment
- EC plantse4
- Outcome
- non-radiative dissipation of absorbed photon energye4
- Direction
- increasede4
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“barley (Hordeum vulgare L. cv. Akcent)”
e4“The increased non-radiative dissipation of absorbed photon energy for all EC plants corresponded to the higher de-epoxidation state of xanthophylls only for PPFD730 barley”
Claim · model-written summary
Non-radiative dissipation under elevated CO2 corresponded to a higher de-epoxidation state of xanthophylls in barley grown at PPFD730.
- Taxon
- barleyHordeum vulgaree0
- Treatment
- PPFD730e4
- Outcome
- de-epoxidation state of xanthophyllse4
- Direction
- highere4
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“barley (Hordeum vulgare L. cv. Akcent)”
e4“The increased non-radiative dissipation of absorbed photon energy for all EC plants corresponded to the higher de-epoxidation state of xanthophylls only for PPFD730 barley”
Claim · model-written summary
Elevated CO2 decreased PS2 photochemical efficiency (FV/FM) in barley grown at 730 and 1 200 μmol m-2 s-1 compared with ambient CO2.
- Taxon
- barleyHordeum vulgaree0
- Treatment
- EC plants grown at 730 and 1 200 μmol m-2 s-1e5
- Outcome
- photosystem 2 (PS2) photochemical efficiencye5
- Direction
- decreasee5
- Comparator
- AC barleye5
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“barley (Hordeum vulgare L. cv. Akcent)”
e5“a pronounced decrease in photosystem 2 (PS2) photochemical efficiency (given as FV/FM) for EC plants grown at 730 and 1 200 μmol m-2 s-1 in comparison with AC barley”
Claim · model-written summary
The decrease in PS2 photochemical efficiency was related to reduced epoxidation of antheraxanthin and zeaxanthin back to violaxanthin in darkness.
- Taxon
- barleyHordeum vulgaree0
- Outcome
- photosystem 2 (PS2) photochemical efficiencye5
- Qualifier
- reduced epoxidation of antheraxanthin and zeaxanthin back to violaxanthin in darknesse6
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“barley (Hordeum vulgare L. cv. Akcent)”
e5“a pronounced decrease in photosystem 2 (PS2) photochemical efficiency (given as FV/FM) for EC plants grown at 730 and 1 200 μmol m-2 s-1 in comparison with AC barley”
e6“was related to the reduced epoxidation of antheraxanthin and zeaxanthin back to violaxanthin in darkness”
Claim · model-written summary
Elevated CO2 sensitised high-irradiance acclimated barley, particularly at PPFD730, to photoinactivation of PS2.
- Taxon
- barleyHordeum vulgaree0
- Outcome
- photoinactivation of PS2e7
- Qualifier
- particularly PPFD730e7
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“barley (Hordeum vulgare L. cv. Akcent)”
e7“the EC conditions sensitise the photosynthetic apparatus of high-irradiance acclimated barley plants (particularly PPFD730) to the photoinactivation of PS2”
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See all 13 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.