Abstract
Cold stress causes considerable damage to tender tea seedlings. Previous studies have explored changes in the physiological and biochemical factors of tea in response to cold stress; however, the mechanisms of cold resistance in ancient tea tree plants are unclear. The aim of this study was to analyze the effects of 0 °C cold stress for 15 days and 24 °C ambient temperature recovery for 5 days on the physiological and biochemical characteristics of two representative old tea varieties: Dali tea and Siqiu tea. The results revealed significant changes in antioxidant, photosynthetic efficiency, and physiological and biochemical indicators in response to cold stress, with the two species exhibiting different patterns. Cold stress decreased chlorophyll and carotene content, Fv/Fm, Y(II), non-photochemical quenching coefficient, photochemical quenching, and superoxide dismutase (SOD) activity, and increased intercellular CO2 concentration and ascorbate peroxidase activity. Siqiu tea showed a higher increase in soluble sugar content and antioxidant enzyme activity and a lower accumulation of malondialdehyde and minimal fluorescence (F0) than Dali, indicating a greater tolerance to cold stress. Based on partial least-squares discriminant analysis, six key differential physiological indicators of cold resistance—water-soluble sugar, F0, peroxidase, catalase, SOD, and gas conductance—were identified. Our findings provide technical support for identifying ways to protect ancient tea trees from extreme weather conditions.
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Claims 10
Claim · model-written summary
Cold stress decreased chlorophyll and carotene content in Dali and Siqiu tea.
- Taxon
- teae0
- Material
- Dali tea and Siqiu teae0
- Treatment
- 0 °C cold stress for 15 dayse0
- Outcome
- chlorophyll and carotene contente1
- Direction
- decreasede1
Not reportedComparator
Verbatim
e0“The aim of this study was to analyze the effects of 0 °C cold stress for 15 days and 24 °C ambient temperature recovery for 5 days on the physiological and biochemical characteristics of two representative old tea varieties: Dali tea and Siqiu tea”
e1“Cold stress decreased chlorophyll and carotene content, Fv/Fm, Y(II), non-photochemical quenching coefficient, photochemical quenching, and superoxide dismutase (SOD) activity, and increased intercellular CO2 concentration and ascorbate peroxidase activity”
Claim · model-written summary
Cold stress decreased Fv/Fm, Y(II) and the non-photochemical quenching coefficient in tea seedlings.
- Taxon
- teae0
- Material
- Dali tea and Siqiu teae0
- Treatment
- 0 °C cold stress for 15 dayse0
- Outcome
- Fv/Fm, Y(II), non-photochemical quenching coefficiente1
- Direction
- decreasede1
Not reportedComparator
Verbatim
e0“The aim of this study was to analyze the effects of 0 °C cold stress for 15 days and 24 °C ambient temperature recovery for 5 days on the physiological and biochemical characteristics of two representative old tea varieties: Dali tea and Siqiu tea”
e1“Cold stress decreased chlorophyll and carotene content, Fv/Fm, Y(II), non-photochemical quenching coefficient, photochemical quenching, and superoxide dismutase (SOD) activity, and increased intercellular CO2 concentration and ascorbate peroxidase activity”
Claim · model-written summary
Cold stress decreased photochemical quenching and SOD activity in tea seedlings.
- Taxon
- teae0
- Material
- Dali tea and Siqiu teae0
- Treatment
- 0 °C cold stress for 15 dayse0
- Outcome
- photochemical quenching, and superoxide dismutase (SOD) activitye1
- Direction
- decreasede1
Not reportedComparator
Verbatim
e0“The aim of this study was to analyze the effects of 0 °C cold stress for 15 days and 24 °C ambient temperature recovery for 5 days on the physiological and biochemical characteristics of two representative old tea varieties: Dali tea and Siqiu tea”
e1“Cold stress decreased chlorophyll and carotene content, Fv/Fm, Y(II), non-photochemical quenching coefficient, photochemical quenching, and superoxide dismutase (SOD) activity, and increased intercellular CO2 concentration and ascorbate peroxidase activity”
Claim · model-written summary
Cold stress increased intercellular CO2 concentration and ascorbate peroxidase activity in tea seedlings.
- Taxon
- teae0
- Material
- Dali tea and Siqiu teae0
- Treatment
- 0 °C cold stress for 15 dayse0
- Outcome
- intercellular CO2 concentration and ascorbate peroxidase activitye1
- Direction
- increasede1
Not reportedComparator
Verbatim
e0“The aim of this study was to analyze the effects of 0 °C cold stress for 15 days and 24 °C ambient temperature recovery for 5 days on the physiological and biochemical characteristics of two representative old tea varieties: Dali tea and Siqiu tea”
e1“Cold stress decreased chlorophyll and carotene content, Fv/Fm, Y(II), non-photochemical quenching coefficient, photochemical quenching, and superoxide dismutase (SOD) activity, and increased intercellular CO2 concentration and ascorbate peroxidase activity”
Claim · model-written summary
Siqiu tea showed a higher increase in soluble sugar content and antioxidant enzyme activity than Dali tea under cold stress.
Verbatim
e2“Siqiu tea showed a higher increase in soluble sugar content and antioxidant enzyme activity and a lower accumulation of malondialdehyde and minimal fluorescence (F0) than Dali, indicating a greater tolerance to cold stress”
Claim · model-written summary
Siqiu tea showed a lower accumulation of malondialdehyde and minimal fluorescence (F0) than Dali tea under cold stress.
Verbatim
e2“Siqiu tea showed a higher increase in soluble sugar content and antioxidant enzyme activity and a lower accumulation of malondialdehyde and minimal fluorescence (F0) than Dali, indicating a greater tolerance to cold stress”
Claim · model-written summary
Siqiu tea has greater tolerance to cold stress than Dali tea (author interpretation).
Verbatim
e2“Siqiu tea showed a higher increase in soluble sugar content and antioxidant enzyme activity and a lower accumulation of malondialdehyde and minimal fluorescence (F0) than Dali, indicating a greater tolerance to cold stress”
Claim · model-written summary
Water-soluble sugar, F0 and peroxidase were identified as key differential cold-resistance indicators by PLS-DA.
Not reportedDirection
Verbatim
e0“The aim of this study was to analyze the effects of 0 °C cold stress for 15 days and 24 °C ambient temperature recovery for 5 days on the physiological and biochemical characteristics of two representative old tea varieties: Dali tea and Siqiu tea”
e3“six key differential physiological indicators of cold resistance—water-soluble sugar, F0, peroxidase, catalase, SOD, and gas conductance—were identified”
Claim · model-written summary
Catalase, SOD and gas conductance were identified as key differential cold-resistance indicators by PLS-DA.
Not reportedDirection
Verbatim
e0“The aim of this study was to analyze the effects of 0 °C cold stress for 15 days and 24 °C ambient temperature recovery for 5 days on the physiological and biochemical characteristics of two representative old tea varieties: Dali tea and Siqiu tea”
e3“six key differential physiological indicators of cold resistance—water-soluble sugar, F0, peroxidase, catalase, SOD, and gas conductance—were identified”
Claim · model-written summary
Cold stress caused significant changes in antioxidant, photosynthetic efficiency and physiological and biochemical indicators, with the two tea varieties differing in pattern.
- Taxon
- teae0
- Treatment
- cold stresse4
- Outcome
- antioxidant, photosynthetic efficiency, and physiological and biochemical indicatorse4
Not reportedDirection
Verbatim
e0“The aim of this study was to analyze the effects of 0 °C cold stress for 15 days and 24 °C ambient temperature recovery for 5 days on the physiological and biochemical characteristics of two representative old tea varieties: Dali tea and Siqiu tea”
e4“The results revealed significant changes in antioxidant, photosynthetic efficiency, and physiological and biochemical indicators in response to cold stress, with the two species exhibiting different patterns”
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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.