Abstract
The growth and development of plants are closely tied to growth stages, such as germination, flower bud differentiation, photosynthesis, water and fertilizer use efficiency, stress resistance, etc. Previous studies on the stress resistance of plants with different leaf stages have primarily focused on single-factor environmental conditions. However, there has been a lack of systematic research on the physiology of plant seedlings under combined high-temperature and high-humidity (HH) stress, and the relationship between cucumber growth stages and HH tolerance remains unclear. In this study, we analyzed the phenotype, photosynthetic characteristics, reactive oxygen species content, and antioxidant enzyme activity of cucumber seedlings at 1-, 2-, 3-, and 4-leaf stages under control (25 °C + 80%RH, CK) and HH (42 °C + 95%RH) stress, aiming to clarify the relationship between growth stage and cucumber HH tolerance. The results indicated that the HH tolerance of cucumber seedlings increases with leaf stage. Seedlings at 1-leaf and 2-leaf stages were most sensitive to HH, whereas 4-leaf seedlings showed the greatest tolerance. Under HH stress, the biomass, chlorophyll content, net photosynthetic rate, and photosynthetic electron transfer rate were significantly reduced compared to CK. Simultaneously, there was an increase in reactive oxygen species content and antioxidant enzyme activity. The relative values for dry weight, total chlorophyll content, net photosynthetic rate, Fv/Fm, qP, ETR, and Y (II) in 1-leaf and 2-leaf seedlings were significantly lower, while ROS accumulation and changes in antioxidant enzyme activity were significantly higher compared to 4-leaf seedlings. This lays a foundation for future studies on the growth and physiological response of cucumber plants at different growth stages under varying temperature and humidity combined stresses.
Abstract from the paper’s OpenAlex record; open copy licensed cc-by. 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 12
Claim · model-written summary
Cucumber tolerance to combined heat and humidity increased with leaf stage.
- Taxon
- cucumber
Cucumis sativuse0 - Organ / stage
- leaf stagee0
- Outcome
- HH tolerancee0
- Direction
- increasese0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“HH tolerance of cucumber seedlings increases with leaf stage”
Claim · model-written summary
One- and two-leaf cucumber seedlings were most sensitive to combined heat and humidity.
- Taxon
- cucumberCucumis sativuse1
- Organ / stage
- 1-leaf and 2-leaf stagese0
- Outcome
- most sensitive to HHe0
Not reportedDirection
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Seedlings at 1-leaf and 2-leaf stages were most sensitive to HH”
e1“cucumber seedlings at 1-, 2-, 3-, and 4-leaf stages”
Claim · model-written summary
Four-leaf cucumber seedlings had greatest heat and humidity tolerance.
- Taxon
- cucumberCucumis sativuse1
- Organ / stage
- 4-leafe0
- Outcome
- tolerancee0
- Direction
- greateste0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“4-leaf seedlings showed the greatest tolerance”
e1“cucumber seedlings at 1-, 2-, 3-, and 4-leaf stages”
Claim · model-written summary
Combined heat and humidity significantly reduced cucumber biomass relative to control.
- Taxon
- cucumberCucumis sativuse1
- Treatment
- HH (42 °C + 95%RH) stresse1
- Outcome
- biomasse0
- Direction
- reducede0
- Comparator
- CKe0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Under HH stress, the biomass, chlorophyll content, net photosynthetic rate, and photosynthetic electron transfer rate were significantly reduced compared to CK.”
e1“cucumber seedlings at 1-, 2-, 3-, and 4-leaf stages under control (25 °C + 80%RH, CK) and HH (42 °C + 95%RH) stress”
Claim · model-written summary
Combined heat and humidity significantly reduced cucumber chlorophyll content, net photosynthetic rate, and photosynthetic electron transfer rate.
- Taxon
- cucumberCucumis sativuse1
- Treatment
- HH (42 °C + 95%RH) stresse1
- Outcome
- chlorophyll content, net photosynthetic rate, and photosynthetic electron transfer ratee0
- Direction
- reducede0
- Comparator
- CKe0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Under HH stress, the biomass, chlorophyll content, net photosynthetic rate, and photosynthetic electron transfer rate were significantly reduced compared to CK.”
e1“cucumber seedlings at 1-, 2-, 3-, and 4-leaf stages under control (25 °C + 80%RH, CK) and HH (42 °C + 95%RH) stress”
Claim · model-written summary
Combined heat and humidity increased cucumber reactive oxygen species content.
- Taxon
- cucumberCucumis sativuse1
- Treatment
- HH (42 °C + 95%RH) stresse1
- Outcome
- reactive oxygen species contente0
- Direction
- increasee0
- Comparator
- CKe1
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“there was an increase in reactive oxygen species content and antioxidant enzyme activity”
e1“cucumber seedlings at 1-, 2-, 3-, and 4-leaf stages under control (25 °C + 80%RH, CK) and HH (42 °C + 95%RH) stress”
Claim · model-written summary
Combined heat and humidity increased cucumber antioxidant enzyme activity.
- Taxon
- cucumberCucumis sativuse1
- Treatment
- HH (42 °C + 95%RH) stresse1
- Outcome
- antioxidant enzyme activitye0
- Direction
- increasee0
- Comparator
- CKe1
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“there was an increase in reactive oxygen species content and antioxidant enzyme activity”
e1“cucumber seedlings at 1-, 2-, 3-, and 4-leaf stages under control (25 °C + 80%RH, CK) and HH (42 °C + 95%RH) stress”
Claim · model-written summary
Under stress, one- and two-leaf cucumber seedlings had significantly lower relative dry weight than four-leaf seedlings.
- Taxon
- cucumberCucumis sativuse1
- Organ / stage
- 1-leaf and 2-leaf seedlingse0
- Outcome
- dry weighte0
- Direction
- lowere0
- Comparator
- 4-leaf seedlingse0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“The relative values for dry weight, total chlorophyll content, net photosynthetic rate, Fv/Fm, qP, ETR, and Y (II) in 1-leaf and 2-leaf seedlings were significantly lower, while ROS accumulation and changes in antioxidant enzyme activity were significantly higher compared to 4-leaf seedlings.”
e1“cucumber seedlings at 1-, 2-, 3-, and 4-leaf stages”
Claim · model-written summary
Under stress, one- and two-leaf cucumber seedlings had significantly lower relative total chlorophyll content, net photosynthetic rate, and Fv/Fm than four-leaf seedlings.
- Taxon
- cucumberCucumis sativuse1
- Organ / stage
- 1-leaf and 2-leaf seedlingse0
- Outcome
- total chlorophyll content, net photosynthetic rate, Fv/Fme0
- Direction
- lowere0
- Comparator
- 4-leaf seedlingse0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“The relative values for dry weight, total chlorophyll content, net photosynthetic rate, Fv/Fm, qP, ETR, and Y (II) in 1-leaf and 2-leaf seedlings were significantly lower, while ROS accumulation and changes in antioxidant enzyme activity were significantly higher compared to 4-leaf seedlings.”
e1“cucumber seedlings at 1-, 2-, 3-, and 4-leaf stages”
Claim · model-written summary
Under stress, one- and two-leaf cucumber seedlings had significantly lower relative qP, ETR, and Y (II) than four-leaf seedlings.
- Taxon
- cucumberCucumis sativuse1
- Organ / stage
- 1-leaf and 2-leaf seedlingse0
- Outcome
- qP, ETR, and Y (II)e0
- Direction
- lowere0
- Comparator
- 4-leaf seedlingse0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“The relative values for dry weight, total chlorophyll content, net photosynthetic rate, Fv/Fm, qP, ETR, and Y (II) in 1-leaf and 2-leaf seedlings were significantly lower, while ROS accumulation and changes in antioxidant enzyme activity were significantly higher compared to 4-leaf seedlings.”
e1“cucumber seedlings at 1-, 2-, 3-, and 4-leaf stages”
Claim · model-written summary
Under stress, one- and two-leaf cucumber seedlings had significantly higher ROS accumulation than four-leaf seedlings.
- Taxon
- cucumberCucumis sativuse2
- Organ / stage
- 1-leaf and 2-leaf seedlingse1
- Outcome
- ROS accumulatione0
- Direction
- highere0
- Comparator
- 4-leaf seedlingse0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“while ROS accumulation and changes in antioxidant enzyme activity were significantly higher compared to 4-leaf seedlings”
e1“in 1-leaf and 2-leaf seedlings were significantly lower”
e2“cucumber seedlings at 1-, 2-, 3-, and 4-leaf stages”
Claim · model-written summary
Under stress, one- and two-leaf cucumber seedlings had significantly higher changes in antioxidant enzyme activity than four-leaf seedlings.
- Taxon
- cucumberCucumis sativuse2
- Organ / stage
- 1-leaf and 2-leaf seedlingse1
- Outcome
- changes in antioxidant enzyme activitye0
- Direction
- highere0
- Comparator
- 4-leaf seedlingse0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“while ROS accumulation and changes in antioxidant enzyme activity were significantly higher compared to 4-leaf seedlings”
e1“in 1-leaf and 2-leaf seedlings were significantly lower”
e2“cucumber seedlings at 1-, 2-, 3-, and 4-leaf stages”
The same questions in other papers
humidity · physiology: photosynthesis · Cucumis sativus (cucumber)Positive and negative results
2 papers in the same direction as this paper · 1 in the opposite direction
- negative
- positive
- no effect
humidity · physiology: oxidative · Cucumis sativus (cucumber)Positive and negative results
2 papers in the same direction as this paper · 1 in the opposite direction
- negative
- positive
- negative
humidity · growth · Cucumis sativus (cucumber)Positive and negative results
3 papers in the same direction as this paper · 2 in the opposite direction
- negative
- positive
- positive
2 papers more in this group
See all 6 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.