Abstract
We hypothesized that decreased stomatal conductance (g s) at elevated CO2 might decrease transpiration (E), increase leaf water potential (ΨW), and thereby protect net photosynthesis rate (P N) from heat damage in maize (Zea mays L) seedlings. To separate long-term effects of elevated CO2, plants grew at either ambient CO2 or elevated CO2. During high-temperature treatment (HT) at 45°C for 15 min, leaves were exposed either to ambient CO2 (380 μmol mol-1) or to elevated CO2 (560 μmol mol-1). HT reduced P N by 25 to 38% across four CO2 combinations. However, the g s and E did not differ among all CO2 treatments during HT. After returning the leaf temperature to 35°C within 30 min, g s and E were the same or higher than the initial values. Leaf water potential (ΨW) was slightly lower at ambient CO2, but not at elevated CO2. This study highlighted that elevated CO2 failed in protecting P N from 45°C via decreasing g s and ΨW.
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Claims 5
Claim · model-written summary
High-temperature treatment reduced net photosynthesis rate in maize by 25 to 38% across four CO2 combinations.
Zea maysNot reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“protect net photosynthesis rate (P N) from heat damage in maize (Zea mays L) seedlings”
e1“HT reduced P N by 25 to 38% across four CO2 combinations”
Claim · model-written summary
Stomatal conductance and transpiration did not differ among CO2 treatments during high-temperature treatment in maize.
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“protect net photosynthesis rate (P N) from heat damage in maize (Zea mays L) seedlings”
e2“However, the g s and E did not differ among all CO2 treatments during HT”
Claim · model-written summary
After heat treatment, stomatal conductance and transpiration in maize were the same or higher than the initial values.
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“protect net photosynthesis rate (P N) from heat damage in maize (Zea mays L) seedlings”
e3“g s and E were the same or higher than the initial values”
Claim · model-written summary
Ambient CO2 gave slightly lower leaf water potential in maize than elevated CO2.
- Treatment
- ambient CO2e4
- Outcome
- Leaf water potential (ΨW)e4
- Direction
- slightly lowere4
- Comparator
- elevated CO2e4
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“protect net photosynthesis rate (P N) from heat damage in maize (Zea mays L) seedlings”
e4“Leaf water potential (ΨW) was slightly lower at ambient CO2, but not at elevated CO2”
Claim · model-written summary
Elevated CO2 failed to protect net photosynthesis from heat in maize, according to the authors.
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“protect net photosynthesis rate (P N) from heat damage in maize (Zea mays L) seedlings”
e5“This study highlighted that elevated CO2 failed in protecting P N”
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