Abstract
Reductions in leaf growth are a commonly observed response to ultraviolet radiation, but the underlying mechanisms remain poorly defined. This study examined the response of leaves exposed to a UV environment across a range of organizational scales, including leaf expansion rate, epidermal cell size and number, biomechanical properties, leaf-water relations and activity of cell-wall peroxidases. Two experimental approaches were used; Lettuce (Lactuca sativa L.) plants were propagated under (a) supplementary UV-B (9 kJ m(-2) day(-1)) in controlled environment (CE) conditions, and (b) field conditions, where plants were placed under three horticultural films with differing UV transmissions. In both experiments, UV-B caused the greatest reductions in leaf expansion and final leaf size, with some reductions attributable to UV-A wavelengths. In supplementary UV-B conditions, adaxial cell size was reduced, while in field plants, both cell size and cell number were lower in an increased UV environment, as was the case with abaxial cells in CE plants. Although leaf turgor and leaf extensibility were not affected by UV wavelengths, breaking strain of leaf tissue was decreased under supplementary UV-B. Cell-wall peroxidase activity was increased in both supplementary UV conditions and in the field, where only a zero UV environment showed no upregulation of cell-wall peroxidase.
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Claims 9
Claim · model-written summary
UV-B caused the greatest reductions in lettuce leaf expansion and final leaf size.
- Taxon
- Lactuca sativa
Lactuca sativae0 - Treatment
- UV-Be1
- Outcome
- leaf expansion and final leaf sizee1
- Direction
- greatest reductionse1
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Lettuce (Lactuca sativa L.) plants were propagated under”
e1“UV-B caused the greatest reductions in leaf expansion and final leaf size, with some reductions attributable to UV-A wavelengths”
Claim · model-written summary
UV-A wavelengths contributed some reductions in lettuce leaf expansion and final leaf size.
- Taxon
- Lactuca sativaLactuca sativae0
- Treatment
- UV-A wavelengthse1
- Outcome
- leaf expansion and final leaf sizee1
- Direction
- reductionse1
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Lettuce (Lactuca sativa L.) plants were propagated under”
e1“UV-B caused the greatest reductions in leaf expansion and final leaf size, with some reductions attributable to UV-A wavelengths”
Claim · model-written summary
Under supplementary UV-B, adaxial cell size was reduced in lettuce leaves.
- Taxon
- Lactuca sativaLactuca sativae0
- Organ / stage
- adaxiale2
- Treatment
- supplementary UV-Be2
- Outcome
- cell sizee2
- Direction
- reducede2
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Lettuce (Lactuca sativa L.) plants were propagated under”
e2“In supplementary UV-B conditions, adaxial cell size was reduced”
Claim · model-written summary
In field plants under increased UV, cell size and cell number were lower.
- Taxon
- Lactuca sativaLactuca sativae0
- Treatment
- increased UV environmente3
- Outcome
- cell size and cell numbere3
- Direction
- lowere3
- Setting
- fielde3
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Lettuce (Lactuca sativa L.) plants were propagated under”
e3“in field plants, both cell size and cell number were lower in an increased UV environment”
Claim · model-written summary
Under increased UV in CE plants, abaxial cells were lower.
- Taxon
- Lactuca sativaLactuca sativae0
- Organ / stage
- abaxial cellse4
- Treatment
- increased UV environmente3
- Outcome
- abaxial cellse4
- Direction
- decreaseinferrede4
- Setting
- CE plantse4
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Lettuce (Lactuca sativa L.) plants were propagated under”
e3“in field plants, both cell size and cell number were lower in an increased UV environment”
e4“as was the case with abaxial cells in CE plants”
Claim · model-written summary
UV wavelengths did not affect lettuce leaf turgor or leaf extensibility.
- Taxon
- Lactuca sativaLactuca sativae0
- Treatment
- UV wavelengthse5
- Outcome
- leaf turgor and leaf extensibilitye5
- Direction
- not affectede5
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Lettuce (Lactuca sativa L.) plants were propagated under”
e5“Although leaf turgor and leaf extensibility were not affected by UV wavelengths”
Claim · model-written summary
Supplementary UV-B decreased the breaking strain of lettuce leaf tissue.
- Taxon
- Lactuca sativaLactuca sativae0
- Treatment
- supplementary UV-Be6
- Outcome
- breaking strain of leaf tissuee6
- Direction
- decreasede6
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Lettuce (Lactuca sativa L.) plants were propagated under”
e6“breaking strain of leaf tissue was decreased under supplementary UV-B”
Claim · model-written summary
Cell-wall peroxidase activity increased under supplementary UV and in the field.
- Taxon
- Lactuca sativaLactuca sativae0
- Treatment
- supplementary UV conditionse7
- Outcome
- Cell-wall peroxidase activitye7
- Direction
- increasede7
- Setting
- the fielde7
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Lettuce (Lactuca sativa L.) plants were propagated under”
e7“Cell-wall peroxidase activity was increased in both supplementary UV conditions and in the field, where only a zero UV environment showed no upregulation”
Claim · model-written summary
Only the zero UV environment showed no upregulation of cell-wall peroxidase activity.
- Taxon
- Lactuca sativaLactuca sativae0
- Treatment
- zero UV environmente7
- Outcome
- Cell-wall peroxidase activitye7
- Direction
- no upregulatione7
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Lettuce (Lactuca sativa L.) plants were propagated under”
e7“Cell-wall peroxidase activity was increased in both supplementary UV conditions and in the field, where only a zero UV environment showed no upregulation”
The same questions in other papers
uv · growth · Lactuca sativa (garden lettuce)Results differ
19 papers in the same direction as this paper · 15 in the opposite direction
- positive
- positive
- positive
31 papers more in this group
See all 35 papers →uv · physiology: antioxidant enzymes · Lactuca sativa (garden lettuce)Results agree
1 paper in the same direction as this paper
- no effect
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.