Abstract
Abstract Gas exchange and chlorophyll a fluorescence transient were examined in leaves of sorghum under salt stress and high temperature. During salt treatment with 50 and 150 m m NaCl, photosynthetic rate (Pn) decreased, which could be ascribed to stomatal limitation. Salt stress had no effect on photosystem II (PSII) activity. At high temperatures, PSII function was inhibited in leaves of sorghum, indicated by the decrease in PSII performance index on absorption base and PSII maximal photochemistry efficiency (Fv/Fm); however, the decrease was lower in salt‐treated sorghum, suggesting that salt adaption enhanced heat tolerance of PSII. The enhanced heat resistance can be expressed on all the components of PSII including reaction centre, donor side and acceptor side. Consistently, a slight decrease in Pn was found in salt‐treated sorghum at high temperatures, indicating that salt adaption also enhanced heat tolerance of photosynthesis. Proline plays an important protective role in plant response to environmental stress, and its large accumulation in salt‐treated sorghum might be the underlying reason leading to the enhanced heat tolerance. As for this pattern of photosynthetic response, sorghum seems to be a reliable crop species for human beings in the face of global warming and increasing salinity of agricultural land.
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Claims 11
Claim · model-written summary
Salt treatment decreased photosynthetic rate.
SorghumNot reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“During salt treatment with 50 and 150 m m NaCl, photosynthetic rate (Pn) decreased”
t0“Sorghum”
Claim · model-written summary
The authors attributed the salt-related photosynthetic decline to stomatal limitation.
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“photosynthetic rate (Pn) decreased, which could be ascribed to stomatal limitation”
t0“Sorghum”
Claim · model-written summary
Salt stress had no reported effect on PSII activity.
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Salt stress had no effect on photosystem II (PSII) activity.”
t0“Sorghum”
Claim · model-written summary
High temperature inhibited PSII function.
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“At high temperatures, PSII function was inhibited in leaves of sorghum, indicated by the decrease in PSII performance index on absorption base and PSII maximal photochemistry efficiency (Fv/Fm)”
Claim · model-written summary
High temperature reduced PSII performance index.
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“the decrease in PSII performance index on absorption base and PSII maximal photochemistry efficiency (Fv/Fm)”
t0“Sorghum”
e1“At high temperatures”
Claim · model-written summary
High temperature reduced PSII maximal photochemistry efficiency.
- Treatment
- high temperaturese1
- Outcome
- PSII maximal photochemistry efficiency (Fv/Fm)e0
- Direction
- decreasee0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“the decrease in PSII performance index on absorption base and PSII maximal photochemistry efficiency (Fv/Fm)”
t0“Sorghum”
e1“At high temperatures”
Claim · model-written summary
The PSII decline at high temperature was lower in salt-treated sorghum.
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“the decrease was lower in salt‐treated sorghum”
Claim · model-written summary
Salt acclimation enhanced heat tolerance across PSII components.
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“The enhanced heat resistance can be expressed on all the components of PSII including reaction centre, donor side and acceptor side.”
t0“Sorghum”
Claim · model-written summary
Photosynthetic rate declined only slightly in salt-treated sorghum at high temperature.
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“a slight decrease in Pn was found in salt‐treated sorghum at high temperatures”
Claim · model-written summary
Proline accumulated strongly in salt-treated sorghum.
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“its large accumulation in salt‐treated sorghum”
e1“Proline plays an important protective role”
Claim · model-written summary
The authors suggest proline accumulation may underlie improved heat tolerance.
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Proline plays an important protective role in plant response to environmental stress, and its large accumulation in salt‐treated sorghum might be the underlying reason leading to the enhanced heat tolerance.”
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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.