Abstract
Ultra-violet (UV) light is one of abiotic stress factors and causes oxidative stress in plants, but a suitable level of UV radiation can be used to enhance the phytochemical content of plants. The accumulation of antioxidant phenolic compounds in UV-exposed plants may vary depending on the conditions of plant (species, cultivar, age, etc.) and UV (wavelength, energy, irradiation period, etc.). To date, however, little research has been conducted on how leaf thickness affects the pattern of phytochemical accumulation. In this study, we conducted an experiment to find out how the antioxidant phenolic content of kale (Brassica oleracea var. acephala) leaves with different thicknesses react to UV-A light. Kale seedlings were grown in a controlled growth chamber for four weeks under the following conditions: 20°C temperature, 60% relative humidity, 12-hour photoperiod, light source (fluorescent lamp), and photosynthetic photon flux density of 121±10 µmol m-2 s-1. The kale plants were then transferred to two chambers with different CO2 concentrations (382±3.2 and 1,027±11.7µmol mol-1), and grown for 10 days. After then, each group of kale plants were subjected to UV-A LED (275+285 nm at peak wavelength) light of 25.4 W m-2 for 5 days. As a result, when kale plants with thickened leaves from treatment with high CO2 were exposed to UV-A, they had lower UV sensitivity than thinner leaves. The Fv/Fm (maximum quantum yield on photosystem II) in the leaves of kale exposed to UV-A in a low-concentration CO2 environment decreased abruptly and significantly immediately after UV treatment, but not in kale leaves exposed to UV-A in a high-concentration CO2 environment. The accumulation pattern of total phenolic content, antioxidant capacity and individual phenolic compounds varied according to leaf thickness. In conclusion, this experiment suggests that the UV intensity should vary based on the leaf thickness (age etc.) during UV treatment for phytochemical enhancement.
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Claims 5
Claim · model-written summary
High-CO2 kale with thicker leaves showed lower UV sensitivity than thinner leaves.
- Taxon
- kale
Brassica oleracea var. viridise0 - Organ / stage
- leavese0
- Treatment
- high CO2e0
- Outcome
- UV sensitivitye0
- Direction
- lowere0
- Comparator
- thinner leavese0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“when kale plants with thickened leaves from treatment with high CO2 were exposed to UV-A, they had lower UV sensitivity than thinner leaves”
Claim · model-written summary
Leaf Fv/Fm fell abruptly and significantly after UV treatment in low CO2.
- Taxon
- kaleBrassica oleracea var. viridise0
- Treatment
- UV-Ae0
- Outcome
- Fv/Fm (maximum quantum yield on photosystem II)e0
- Direction
- decreasede0
- Qualifier
- low-concentration CO2 environmente0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“The Fv/Fm (maximum quantum yield on photosystem II) in the leaves of kale exposed to UV-A in a low-concentration CO2 environment decreased abruptly and significantly immediately after UV treatment”
Claim · model-written summary
The corresponding high-CO2 leaves did not show an abrupt significant Fv/Fm decline.
- Taxon
- kaleBrassica oleracea var. viridise0
- Outcome
- kale leaves exposed to UV-A in a high-concentration CO2 environmente0
Not reportedDirection
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“but not in kale leaves exposed to UV-A in a high-concentration CO2 environment”
Claim · model-written summary
Total phenolic content, antioxidant capacity and individual phenolics varied with leaf thickness.
- Taxon
- kaleBrassica oleracea var. viridist0
- Organ / stage
- leafe0
- Outcome
- total phenolic content, antioxidant capacity and individual phenolic compoundse0
Not reportedDirection
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“The accumulation pattern of total phenolic content, antioxidant capacity and individual phenolic compounds varied according to leaf thickness”
t0“Kale”
Claim · model-written summary
UV intensity should vary with leaf thickness during phytochemical enhancement.
- Taxon
- kaleBrassica oleracea var. viridist0
- Outcome
- UV intensity should vary based on the leaf thickness (age etc.) during UV treatment for phytochemical enhancemente0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“the UV intensity should vary based on the leaf thickness (age etc.) during UV treatment for phytochemical enhancement”
t0“Kale”
The same questions in other papers
uv · physiology: photosynthesis · Brassica oleracea (wild cabbage)Positive and negative results
3 papers in the same direction as this paper · 2 in the opposite direction
- positive
- positive
- no effect
2 papers more in this group
See all 6 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.