Abstract
Tea (Camellia sinensis), a globally cultivated beverage crop, is sensitive to drought, which can have an adverse effect on the yield and quality of tea. Azoxystrobin (AZ) is one kind of fungicide considered as an agent to relieve damage caused by stress. Initially, the response of tea plant to osmotic-gradient stress was evaluated using leaf disc assays with PEG-induced osmotic stress. The decline of the maximum quantum yield of PSII (Fv/Fm), actual photosynthetic efficiency of PS II (Y(II)), total chlorophylls, carotenoids, DPPH radical scavenging capacity, reducing power, total phenols, and the increase in MDA was observed in leaf discs treated with a gradient of PEG solutions (22.8, 33.2, 41.1% PEG, and blank). These results revealed that efficiency of photosystem II (PSII), photosynthetic pigments, and antioxidant ability in leaf discs were inhibited with an aggravated lipid peroxidation under PEG-induced osmotic stress, and indicated leaf disc assay with moderate PEG iso-osmotic condition would reflect a portion of tea plant response to drought stress. Therefore, the protective effect of AZ (0.125 and 1.25 g a.i. L−1) on tea plants suffering from drought was evaluated using leaf disc assays with 22.8% PEG iso-osmotic condition. Pretreatment of AZ (0.125 a.i. g L−1) reversed Fv/Fm, Y(II), DPPH radical scavenging capacity, and reducing power with reduced MDA in PEG-treated leaf discs, but photosynthetic pigments, total phenols, and ascorbate peroxidase activity were irresponsive to AZ. An Alleviated physiological damage in tea leaf with AZ applying was preliminarily revealed in this study. A Rapid screening of agents for tea plants against drought was developed to assist in the selection of protective agents.
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Claims 9
Claim · model-written summary
PEG stress lowered Fv/Fm, Y(II) and photosynthetic pigments in tea leaf discs.
- Taxon
- Tea (Camellia sinensis)
Camellia sinensist0 - Treatment
- PEG solutions (22.8, 33.2, 41.1% PEG, and blank)e1
- Outcome
- maximum quantum yield of PSII (Fv/Fm), actual photosynthetic efficiency of PS II (Y(II)), total chlorophylls, carotenoidse0
- Direction
- declinee0
- Comparator
- blanke1
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“The decline of the maximum quantum yield of PSII (Fv/Fm), actual photosynthetic efficiency of PS II (Y(II)), total chlorophylls, carotenoids”
e1“in leaf discs treated with a gradient of PEG solutions (22.8, 33.2, 41.1% PEG, and blank)”
t0“Tea (Camellia sinensis)”
Claim · model-written summary
PEG stress lowered antioxidant measures and total phenols in tea leaf discs.
- Taxon
- Tea (Camellia sinensis)Camellia sinensist0
- Treatment
- PEG solutions (22.8, 33.2, 41.1% PEG, and blank)e2
- Outcome
- DPPH radical scavenging capacity, reducing power, total phenolse0
- Direction
- declinee1
- Comparator
- blanke2
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“DPPH radical scavenging capacity, reducing power, total phenols”
e1“The decline of the maximum quantum yield of PSII”
e2“in leaf discs treated with a gradient of PEG solutions (22.8, 33.2, 41.1% PEG, and blank)”
t0“Tea (Camellia sinensis)”
Claim · model-written summary
PEG stress increased MDA in tea leaf discs.
- Taxon
- Tea (Camellia sinensis)Camellia sinensist0
- Treatment
- PEG solutions (22.8, 33.2, 41.1% PEG, and blank)e0
- Outcome
- MDAe0
- Direction
- increasee0
- Comparator
- blanke0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“the increase in MDA was observed in leaf discs treated with a gradient of PEG solutions (22.8, 33.2, 41.1% PEG, and blank)”
t0“Tea (Camellia sinensis)”
Claim · model-written summary
Moderate PEG leaf disc conditions reflected part of tea drought response.
Verbatim
e0“leaf disc assay with moderate PEG iso-osmotic condition would reflect a portion of tea plant response to drought stress”
Claim · model-written summary
Azoxystrobin pretreatment reversed Fv/Fm and Y(II) under PEG stress.
- Taxon
- Tea (Camellia sinensis)Camellia sinensist0
- Treatment
- Pretreatment of AZ (0.125 a.i. g L−1)e0
- Outcome
- Fv/Fm, Y(II)e0
- Direction
- reversede0
- Qualifier
- PEG-treated leaf discse0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Pretreatment of AZ (0.125 a.i. g L−1) reversed Fv/Fm, Y(II), DPPH radical scavenging capacity, and reducing power with reduced MDA in PEG-treated leaf discs”
t0“Tea (Camellia sinensis)”
Claim · model-written summary
Azoxystrobin pretreatment reversed antioxidant capacity and reducing power under PEG stress.
- Taxon
- Tea (Camellia sinensis)Camellia sinensist0
- Treatment
- Pretreatment of AZ (0.125 a.i. g L−1)e0
- Outcome
- DPPH radical scavenging capacity, and reducing powere0
- Direction
- reversede0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Pretreatment of AZ (0.125 a.i. g L−1) reversed Fv/Fm, Y(II), DPPH radical scavenging capacity, and reducing power with reduced MDA in PEG-treated leaf discs”
t0“Tea (Camellia sinensis)”
Claim · model-written summary
Azoxystrobin reduced MDA in PEG-treated tea leaf discs.
- Taxon
- Tea (Camellia sinensis)Camellia sinensist0
- Treatment
- Pretreatment of AZ (0.125 a.i. g L−1)e0
- Outcome
- MDAe0
- Direction
- reducede0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Pretreatment of AZ (0.125 a.i. g L−1) reversed Fv/Fm, Y(II), DPPH radical scavenging capacity, and reducing power with reduced MDA in PEG-treated leaf discs”
t0“Tea (Camellia sinensis)”
Claim · model-written summary
Photosynthetic pigments, total phenols and ascorbate peroxidase activity did not respond to AZ.
- Taxon
- Tea (Camellia sinensis)Camellia sinensist0
- Treatment
- AZe0
- Outcome
- photosynthetic pigments, total phenols, and ascorbate peroxidase activitye0
- Direction
- irresponsivee0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“photosynthetic pigments, total phenols, and ascorbate peroxidase activity were irresponsive to AZ”
t0“Tea (Camellia sinensis)”
Claim · model-written summary
A rapid tea leaf disc assay was developed to screen drought protective agents.
Verbatim
e0“A Rapid screening of agents for tea plants against drought was developed to assist in the selection of protective agents”
The same questions in other papers
drought · quality: phytochemicals · Camellia sinensis (black tea)Positive and negative results
1 paper in the same direction as this paper · 1 in the opposite direction
- positive
- negative
drought · physiology: oxidative · Camellia sinensis (black tea)Results agree
3 papers in the same direction as this paper
- negative
- negative
- negative
drought · physiology: photosynthesis · Camellia sinensis (black tea)Results agree
3 papers in the same direction as this paper
- negative
- negative
- negative
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.