Abstract
Aims High temperature is one of the major abiotic factors that limit plant growth and development in many regions of the world. Although plant thermo-tolerance has been extensively investigated,little attention has been paid to the effects of root temperature on thermo-stability of the photosynthetic apparatus. Our objective was to investigate the effects of variation in root temperature on photosynthetic apparatus and explore potential mechanisms. Methods Under high air temperature (37 and 40 ℃),root temperatures of Prunus mira seedlings were increased gradually (variable root temperature) or kept at (25±2) ℃ (appropriate root temperature) throughout the treatment. We examined relative water content,H2O2 concentration,malondialdehyde (MDA) concentration,activity of antioxidant enzymes,cholorophyll a fluorescence and ABA content in leaves. The experimental design was completely randomized,and each treatment was replicated at least three times. Important findings The combination of high air temperature and appropriate root temperature induced a decrease in activities of antioxidant enzymes and maximum quantum yield of PSII (Fv/Fm) with relatively high leaf relative water content (RWC). Hydrogen peroxide (H2O2) and MDA increased,indicating the photosynthetic apparatus was damaged by high temperature. The combination of high air temperature and gradually increasing root temperature reduced damage to the photosynthetic apparatus with significant improvement in antioxidant enzymes activities and leaf ABA content. Therefore,root temperature plays an important role in enhancing the thermo-stability of the photosynthetic apparatus. First,roots at appropriate temperature maintain high relative water content of leaves,but have damaged photosynthetic apparatus. Second,roots sensed the temperature stimulus and increased the leaf ABA accumulation when root temperature increased gradually,and high leaf ABA level prevented damage to the photosynthetic apparatus and enhanced heat-resistance.
Abstract from the paper’s OpenAlex record, shown for indexing and research. Copyright remains with the authors or the publisher. Read at the source ↗
The text the model read, with the source record’s inline markup (italics, sub- and superscripts) rendered and its character entities decoded; quote offsets refer to the raw text.
Claims 8
Claim · model-written summary
Appropriate root temperature combined with high air temperature decreased antioxidant enzyme activities and Fv/Fm.
- Taxon
- Prunus mira seedlings
Prunus mirae1 - Treatment
- high air temperature and appropriate root temperaturee2
- Outcome
- activities of antioxidant enzymes and maximum quantum yield of PSII (Fv/Fm)e2
- Direction
- decreasee2
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e1“Under high air temperature (37 and 40 ℃),root temperatures of Prunus mira seedlings were increased gradually (variable root temperature) or kept at (25±2) ℃ (appropriate root temperature) throughout the treatment”
e2“The combination of high air temperature and appropriate root temperature induced a decrease in activities of antioxidant enzymes and maximum quantum yield of PSII (Fv/Fm) with relatively high leaf relative water content (RWC)”
Claim · model-written summary
Roots at appropriate temperature maintained high relative water content of leaves.
- Taxon
- Prunus mira seedlingsPrunus mirae1
- Outcome
- relative water content of leavese5
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e1“Under high air temperature (37 and 40 ℃),root temperatures of Prunus mira seedlings were increased gradually (variable root temperature) or kept at (25±2) ℃ (appropriate root temperature) throughout the treatment”
e5“First,roots at appropriate temperature maintain high relative water content of leaves,but have damaged photosynthetic apparatus”
Claim · model-written summary
Hydrogen peroxide and MDA increased under high air temperature, indicating photosynthetic apparatus damage.
- Taxon
- Prunus mira seedlingsPrunus mirae1
- Treatment
- high air temperaturee1
- Outcome
- Hydrogen peroxide (H2O2) and MDAe3
- Direction
- increasede3
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e1“Under high air temperature (37 and 40 ℃),root temperatures of Prunus mira seedlings were increased gradually (variable root temperature) or kept at (25±2) ℃ (appropriate root temperature) throughout the treatment”
e3“Hydrogen peroxide (H2O2) and MDA increased,indicating the photosynthetic apparatus was damaged by high temperature”
Claim · model-written summary
Gradually increasing root temperature under high air temperature reduced damage to the photosynthetic apparatus.
- Taxon
- Prunus mira seedlingsPrunus mirae1
- Treatment
- gradually increasing root temperaturee4
- Outcome
- damage to the photosynthetic apparatuse4
- Direction
- reducede4
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e1“Under high air temperature (37 and 40 ℃),root temperatures of Prunus mira seedlings were increased gradually (variable root temperature) or kept at (25±2) ℃ (appropriate root temperature) throughout the treatment”
e4“The combination of high air temperature and gradually increasing root temperature reduced damage to the photosynthetic apparatus with significant improvement in antioxidant enzymes activities and leaf ABA content”
Claim · model-written summary
Gradually increasing root temperature significantly improved antioxidant enzyme activities and leaf ABA content under high air temperature.
- Taxon
- Prunus mira seedlingsPrunus mirae1
- Treatment
- gradually increasing root temperaturee4
- Outcome
- antioxidant enzymes activities and leaf ABA contente4
- Direction
- improvemente4
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e1“Under high air temperature (37 and 40 ℃),root temperatures of Prunus mira seedlings were increased gradually (variable root temperature) or kept at (25±2) ℃ (appropriate root temperature) throughout the treatment”
e4“The combination of high air temperature and gradually increasing root temperature reduced damage to the photosynthetic apparatus with significant improvement in antioxidant enzymes activities and leaf ABA content”
Claim · model-written summary
High leaf ABA level prevented damage to the photosynthetic apparatus.
- Taxon
- Prunus mira seedlingsPrunus mirae1
- Compound
- ABAe6
- Outcome
- damage to the photosynthetic apparatuse6
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e1“Under high air temperature (37 and 40 ℃),root temperatures of Prunus mira seedlings were increased gradually (variable root temperature) or kept at (25±2) ℃ (appropriate root temperature) throughout the treatment”
e6“Second,roots sensed the temperature stimulus and increased the leaf ABA accumulation when root temperature increased gradually,and high leaf ABA level prevented damage to the photosynthetic apparatus and enhanced heat-resistance”
Claim · model-written summary
High leaf ABA level enhanced heat-resistance.
- Taxon
- Prunus mira seedlingsPrunus mirae1
- Compound
- ABAe6
- Outcome
- heat-resistancee6
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e1“Under high air temperature (37 and 40 ℃),root temperatures of Prunus mira seedlings were increased gradually (variable root temperature) or kept at (25±2) ℃ (appropriate root temperature) throughout the treatment”
e6“Second,roots sensed the temperature stimulus and increased the leaf ABA accumulation when root temperature increased gradually,and high leaf ABA level prevented damage to the photosynthetic apparatus and enhanced heat-resistance”
Claim · model-written summary
Gradually increasing root temperature increased leaf ABA accumulation.
- Taxon
- Prunus mira seedlingsPrunus mirae1
- Treatment
- root temperature increased graduallye6
- Outcome
- leaf ABA accumulatione6
- Direction
- increasede6
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e1“Under high air temperature (37 and 40 ℃),root temperatures of Prunus mira seedlings were increased gradually (variable root temperature) or kept at (25±2) ℃ (appropriate root temperature) throughout the treatment”
e6“Second,roots sensed the temperature stimulus and increased the leaf ABA accumulation when root temperature increased gradually,and high leaf ABA level prevented damage to the photosynthetic apparatus and enhanced heat-resistance”