Abstract
Using quartz optical fibres, penetration of both monochromatic (310 nm) and polychromatic UV‐B (280–320 nm) radiation in leaves of Brassica napus L. (cv. Ceres) was measured. Plants were grown under either visible light (750 μmol m −2 s −1 photosynthetically active radiation) or with the addition of 8. 9 KJ m −2 day −1 biologically effective UV‐B (UV‐B BE ) radiation. Results showed that of the 310 nm radiation that penetreated the leaf, 90% was within the intial one third of the leaf with high attenuation in the leaf epidermis, especially in UV‐treated plants. Polychromatic UV‐B radiation, relative to incident radiation, showed a relatively uniform spectral distribution within the leaf, except for collimated radiation. Over 30% of the UV‐screening pigments in the leaf, including flavonoids, were found in the adaxial epidermal layer, making this layer less transparent to UV‐B radiation than the abaxial epidermis, which contained less than 12% of the UV‐screening pigments. UV‐screening pigments increased by 20% in UV‐treated leaves relative to control leaves. Densely arranged epicuticular wax on the adaxial leaf surface of UV‐treated plants may have further decreased penetration of UV‐B radiation by reflectance. An increased leaf thickness, and decreases in leaf area and leaf dry weight were also found for UV‐treated plants.
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Claims 8
Claim · model-written summary
Most penetrating 310 nm radiation was confined to the first third of the leaf, with strong epidermal attenuation especially after UV treatment.
- Taxon
- Brassica napus
_Brassica_napus_-_Habit.jpg?width=60)
Brassica napust0 - Organ / stage
- leaf epidermise0
- Outcome
- 310 nm radiatione1
- Value
- 90%e0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
_Brassica_napus_-_Habit.jpg?width=500)
Verbatim
e0“90% was within the intial one third of the leaf with high attenuation in the leaf epidermis, especially in UV‐treated plants”
t0“Brassica napus”
e1“310 nm radiation that penetreated the leaf”
Claim · model-written summary
Polychromatic UV-B had a relatively uniform internal spectral distribution except for collimated radiation.
- Taxon
- Brassica napusBrassica napust0
- Outcome
- relatively uniform spectral distributione0
- Qualifier
- except for collimated radiatione0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Polychromatic UV‐B radiation, relative to incident radiation, showed a relatively uniform spectral distribution within the leaf, except for collimated radiation”
t0“Brassica napus”
Claim · model-written summary
Over 30% of leaf UV-screening pigments occurred in the adaxial epidermis.
- Taxon
- Brassica napusBrassica napust0
- Organ / stage
- adaxial epidermal layere0
- Outcome
- UV‐screening pigmentse0
- Value
- Over 30%e0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Over 30% of the UV‐screening pigments in the leaf, including flavonoids, were found in the adaxial epidermal layer”
t0“Brassica napus”
Claim · model-written summary
The adaxial epidermis was less transparent to UV-B than the abaxial epidermis, which held under 12% of screening pigments.
- Taxon
- Brassica napusBrassica napust0
- Outcome
- transparent to UV‐B radiatione0
- Direction
- lesse0
- Qualifier
- less than 12%e0
- Comparator
- abaxial epidermise0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“making this layer less transparent to UV‐B radiation than the abaxial epidermis, which contained less than 12% of the UV‐screening pigments”
t0“Brassica napus”
Claim · model-written summary
UV treatment increased leaf UV-screening pigments by 20% relative to controls.
- Taxon
- Brassica napusBrassica napust0
- Treatment
- UV‐treatede0
- Outcome
- UV‐screening pigmentse0
- Direction
- increasede0
- Value
- 20%e0
- Comparator
- control leavese0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“UV‐screening pigments increased by 20% in UV‐treated leaves relative to control leaves”
t0“Brassica napus”
Claim · model-written summary
Dense adaxial epicuticular wax in UV-treated plants may further reduce UV-B penetration by reflectance.
- Taxon
- Brassica napusBrassica napust0
- Organ / stage
- adaxial leaf surfacee0
- Outcome
- penetration of UV‐B radiatione0
- Direction
- decreasede0
- Qualifier
- by reflectancee0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Densely arranged epicuticular wax on the adaxial leaf surface of UV‐treated plants may have further decreased penetration of UV‐B radiation by reflectance”
t0“Brassica napus”
Claim · model-written summary
UV-treated leaves were thicker.
- Taxon
- Brassica napusBrassica napust0
- Treatment
- UV‐treated plantse0
- Outcome
- leaf thicknesse0
- Direction
- increasede0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“An increased leaf thickness, and decreases in leaf area and leaf dry weight were also found for UV‐treated plants”
t0“Brassica napus”
Claim · model-written summary
UV-treated plants had less leaf area and leaf dry weight.
- Taxon
- Brassica napusBrassica napust0
- Treatment
- UV‐treated plantse0
- Outcome
- leaf area and leaf dry weighte0
- Direction
- decreasese0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“An increased leaf thickness, and decreases in leaf area and leaf dry weight were also found for UV‐treated plants”
t0“Brassica napus”
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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.