Abstract
The freshness and color quality of postharvest tea leaves can be markedly prolonged and retained by proper preservation measures. Here, we investigated the dynamic changes of chlorophyll and its derivatives in postharvest tea leaves under different low-temperature treatments using natural withering as a control. Chlorophyll decomposition was found closely related with chlorophyllide, pheophorbide, and pheophytin. Low-temperature withering could slow chlorophyll degradation in postharvest tea leaves via significant inhibition on the enzyme activity and gene expression of Mg-dechelatase, chlorophyllase, and pheophorbide a oxygenase. At the initial stage of withering, a significant increase was observed in the chlorophyll content, expression of chlorophyll-synthesis-related enzymes (such as glutamyl-tRNA synthetase, etc.), and chlorophyll synthase activity in newly picked tea leaves. Moreover, an obvious decrease was found in the content of l-glutamate as the foremost precursor substance of chlorophyll synthesis. Hence, our findings revealed that the chlorophyll synthesis reaction was induced by the light–dehydration–stress in the initial withering of tea leaves. This study provides a theoretical basis for exploring preservation technology in actual green tea production.
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Claims 9
Claim · model-written summary
Chlorophyll decomposition was closely related to chlorophyllide, pheophorbide and pheophytin.
- Taxon
- Camellia sinensis L.
Camellia sinensist0 - Compound
- chlorophyllide, pheophorbide, and pheophytine0
- Outcome
- Chlorophyll decompositione0
Not reportedDirection
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
t0“Tea (Camellia sinensis L.)”
e0“Chlorophyll decomposition was found closely related with chlorophyllide, pheophorbide, and pheophytin”
Claim · model-written summary
Low-temperature withering slowed chlorophyll degradation.
- Taxon
- Camellia sinensis L.Camellia sinensist0
- Treatment
- Low-temperature witheringe0
- Outcome
- chlorophyll degradatione0
- Direction
- slowe0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
t0“Tea (Camellia sinensis L.)”
e0“Low-temperature withering could slow chlorophyll degradation in postharvest tea leaves”
Claim · model-written summary
Low-temperature withering significantly inhibited Mg-dechelatase, chlorophyllase and pheophorbide a oxygenase enzyme activity.
- Taxon
- Camellia sinensis L.Camellia sinensist0
- Treatment
- Low-temperature witheringe1
- Gene
- Mg-dechelatase, chlorophyllase, and pheophorbide a oxygenasee0
- Outcome
- enzyme activitye0
- Direction
- inhibitione0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
t0“Tea (Camellia sinensis L.)”
e0“significant inhibition on the enzyme activity and gene expression of Mg-dechelatase, chlorophyllase, and pheophorbide a oxygenase”
e1“Low-temperature withering could slow chlorophyll degradation in postharvest tea leaves”
Claim · model-written summary
Low-temperature withering significantly inhibited expression of Mg-dechelatase, chlorophyllase and pheophorbide a oxygenase.
- Taxon
- Camellia sinensis L.Camellia sinensist0
- Treatment
- Low-temperature witheringe1
- Gene
- Mg-dechelatase, chlorophyllase, and pheophorbide a oxygenasee0
- Outcome
- gene expressione0
- Direction
- inhibitione0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
t0“Tea (Camellia sinensis L.)”
e0“significant inhibition on the enzyme activity and gene expression of Mg-dechelatase, chlorophyllase, and pheophorbide a oxygenase”
e1“Low-temperature withering could slow chlorophyll degradation in postharvest tea leaves”
Claim · model-written summary
Chlorophyll content in newly picked tea leaves increased significantly at the start of withering.
- Taxon
- Camellia sinensis L.Camellia sinensist0
- Outcome
- chlorophyll contente0
- Direction
- increasee0
- Qualifier
- initial stage of witheringe0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
t0“Tea (Camellia sinensis L.)”
e0“At the initial stage of withering, a significant increase was observed in the chlorophyll content”
Claim · model-written summary
Expression of chlorophyll-synthesis-related enzymes increased significantly at the start of withering.
- Taxon
- Camellia sinensis L.Camellia sinensist0
- Gene
- glutamyl-tRNA synthetasee0
- Outcome
- expression of chlorophyll-synthesis-related enzymese0
- Direction
- increasee0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
t0“Tea (Camellia sinensis L.)”
e0“a significant increase was observed in the chlorophyll content, expression of chlorophyll-synthesis-related enzymes (such as glutamyl-tRNA synthetase, etc.), and chlorophyll synthase activity”
Claim · model-written summary
Chlorophyll synthase activity increased significantly at the start of withering.
- Taxon
- Camellia sinensis L.Camellia sinensist0
- Gene
- chlorophyll synthasee0
- Outcome
- chlorophyll synthase activitye0
- Direction
- increasee0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
t0“Tea (Camellia sinensis L.)”
e0“a significant increase was observed in the chlorophyll content, expression of chlorophyll-synthesis-related enzymes (such as glutamyl-tRNA synthetase, etc.), and chlorophyll synthase activity”
Claim · model-written summary
L-glutamate content decreased during initial withering.
- Taxon
- Camellia sinensis L.Camellia sinensist0
- Outcome
- content of l-glutamatee0
- Direction
- decreasee0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
t0“Tea (Camellia sinensis L.)”
e0“an obvious decrease was found in the content of l-glutamate as the foremost precursor substance of chlorophyll synthesis”
Claim · model-written summary
Light-dehydration stress induced chlorophyll synthesis at initial withering.
- Taxon
- Camellia sinensis L.Camellia sinensist0
- Outcome
- chlorophyll synthesis reactione0
- Qualifier
- light–dehydration–stresse0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
t0“Tea (Camellia sinensis L.)”
e0“chlorophyll synthesis reaction was induced by the light–dehydration–stress in the initial withering of tea leaves”
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See all 10 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.