Abstract
This study monitored changes in chlorophyll fluorescence (CF), growth parameters, soil moisture content, phytochemical content (proline, ascorbic acid, chlorophyll, total phenol content (TPC), and total flavonoid content (TFC)), and antioxidant activities in 12-day-old lettuce (Lactuca sativa L.) seedlings grown under drought stress (no irrigation) and control (well irrigated) treatments in controlled conditions for eight days. Measurements occurred at two-day intervals. Among ten CF parameters studied, effective quantum yield of photochemical energy conversion in PSII (Y(PSII)), coefficient of photochemical quenching (qP), and coefficient of photochemical quenching of variable fluorescence based on the lake model of PSII (qL) significantly decreased in drought-stressed seedlings from day 6 of treatment compared to control. In contrast, maximum quantum yield (Fv/Fm), ratio of fluorescence (Rfd), and quantum yield of non-regulated energy dissipation in PSII (Y(NO)) were significantly affected only at the end. All growth parameters decreased in drought-stressed seedlings compared to control. Proline started increasing from day 4 and showed ~660-fold elevation on day 8 compared to control. Chlorophyll, ascorbic acid, TPC, TFC, and antioxidant activities decreased in drought-stressed seedlings. Results showed major changes in all parameters in seedlings under prolonged drought stress. These findings clarify effects of drought stress in lettuce seedlings during progressive drought exposure and will be useful in the seedling industry.
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Claims 6
Claim · model-written summary
Y(PSII), qP and qL significantly decreased in drought-stressed lettuce seedlings from day 6 compared with control.
- Taxon
- lettuce
Lactuca sativae0 - Treatment
- drought stresse0
- Outcome
- effective quantum yield of photochemical energy conversion in PSII (Y(PSII)), coefficient of photochemical quenching (qP), and coefficient of photochemical quenching of variable fluorescence based on the lake model of PSII (qL)e1
- Direction
- significantly decreasede1
- Qualifier
- from day 6 of treatmente1
- Comparator
- controle0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“12-day-old lettuce (Lactuca sativa L.) seedlings grown under drought stress (no irrigation) and control (well irrigated) treatments”
e1“effective quantum yield of photochemical energy conversion in PSII (Y(PSII)), coefficient of photochemical quenching (qP), and coefficient of photochemical quenching of variable fluorescence based on the lake model of PSII (qL) significantly decreased in drought-stressed seedlings from day 6 of treatment compared to control”
Claim · model-written summary
Fv/Fm, Rfd and Y(NO) were significantly affected by drought only at the end of the treatment.
- Taxon
- lettuceLactuca sativae0
- Treatment
- drought stresse0
- Outcome
- maximum quantum yield (Fv/Fm), ratio of fluorescence (Rfd), and quantum yield of non-regulated energy dissipation in PSII (Y(NO))e2
- Qualifier
- only at the ende2
- Comparator
- controle0
Not reportedDirection
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“12-day-old lettuce (Lactuca sativa L.) seedlings grown under drought stress (no irrigation) and control (well irrigated) treatments”
e2“In contrast, maximum quantum yield (Fv/Fm), ratio of fluorescence (Rfd), and quantum yield of non-regulated energy dissipation in PSII (Y(NO)) were significantly affected only at the end”
Claim · model-written summary
All growth parameters decreased in drought-stressed lettuce seedlings compared with control.
- Taxon
- lettuceLactuca sativae0
- Treatment
- drought stresse0
- Outcome
- growth parameterse3
- Direction
- decreasede3
- Comparator
- controle3
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“12-day-old lettuce (Lactuca sativa L.) seedlings grown under drought stress (no irrigation) and control (well irrigated) treatments”
e3“All growth parameters decreased in drought-stressed seedlings compared to control”
Claim · model-written summary
Proline increased from day 4 and reached about 660-fold elevation on day 8 compared with control in drought-stressed lettuce seedlings.
- Taxon
- lettuceLactuca sativae0
- Treatment
- drought stresse0
- Outcome
- Prolinee4
- Direction
- increasinge4
- Value
- ~660-folde4
- Qualifier
- from day 4e4
- Comparator
- controle4
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“12-day-old lettuce (Lactuca sativa L.) seedlings grown under drought stress (no irrigation) and control (well irrigated) treatments”
e4“Proline started increasing from day 4 and showed ~660-fold elevation on day 8 compared to control”
Claim · model-written summary
Chlorophyll, ascorbic acid and TPC decreased in drought-stressed lettuce seedlings.
- Taxon
- lettuceLactuca sativae0
- Treatment
- drought stresse0
- Outcome
- Chlorophyll, ascorbic acid, TPCe5
- Direction
- decreasede5
- Comparator
- controle0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“12-day-old lettuce (Lactuca sativa L.) seedlings grown under drought stress (no irrigation) and control (well irrigated) treatments”
e5“Chlorophyll, ascorbic acid, TPC, TFC, and antioxidant activities decreased in drought-stressed seedlings”
Claim · model-written summary
TFC and antioxidant activities decreased in drought-stressed lettuce seedlings.
- Taxon
- lettuceLactuca sativae0
- Treatment
- drought stresse0
- Outcome
- TFC, and antioxidant activitiese5
- Direction
- decreasede5
- Comparator
- controle0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“12-day-old lettuce (Lactuca sativa L.) seedlings grown under drought stress (no irrigation) and control (well irrigated) treatments”
e5“Chlorophyll, ascorbic acid, TPC, TFC, and antioxidant activities decreased in drought-stressed seedlings”
The same questions in other papers
drought · quality: phytochemicals · Lactuca sativa (garden lettuce)Results differ
1 paper in the same direction as this paper · 2 in the opposite direction
- positive
- positive
- no effect
drought · growth · Lactuca sativa (garden lettuce)Results differ
12 papers in the same direction as this paper · 6 in the opposite direction
- no effect
- positive
- positive
15 papers more in this group
See all 19 papers →drought · physiology: photosynthesis · Lactuca sativa (garden lettuce)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.