Abstract
BACKGROUND: The effects of short-term ultraviolet B (UV-B) irradiation on sweet basil (Ocimum basilicum L. cv. Cinnamon) plants at the 3-4 leaf pair and flowering stages were examined in controlled environment growth chambers. Plants were exposed to 0 (reference), 2 and 4 kJ UV-B m(-2) day(-1) over 7 days. RESULTS: Exposure of basil plants to supplementary UV-B light resulted in increased assimilating leaf area, fresh biomass and dry biomass. Stimulation of physiological functions in young basil plants under either applied UV-B dose resulted in increased total chlorophyll content but no marked variation in carotenoid content. At the flowering stage the chlorophyll and carotenoid contents of basil were affected by supplementary UV-B radiation, decreasing with enhanced UV-B exposure. Both total antioxidant activity (2,2-diphenyl-1-picrylhydrazyl free radical assay) and total phenolic compound content were increased by UV-B light supplementation. Young and mature basil plants differed in their ascorbic acid content, which was dependent on UV-B dose and plant age. UV-B radiation resulted in decreased nitrate content in young basil plants (3-4 leaf pair stage). CONCLUSION: These results indicate that the application of short-exposure UV-B radiation beneficially influenced both growth parameters and biochemical constituents in young and mature basil plants.
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Claims 8
Claim · model-written summary
Supplementary UV-B increased basil assimilating leaf area, fresh biomass and dry biomass.
- Taxon
- basil
Ocimum basilicume0 - Treatment
- supplementary UV-B lighte0
- Outcome
- assimilating leaf area, fresh biomass and dry biomasse0
- Direction
- increasede0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Exposure of basil plants to supplementary UV-B light resulted in increased assimilating leaf area, fresh biomass and dry biomass”
Claim · model-written summary
Applied UV-B dose increased total chlorophyll content in young basil plants.
- Taxon
- basilOcimum basilicume1
- Treatment
- applied UV-B dosee1
- Outcome
- total chlorophyll contente1
- Direction
- increasede1
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e1“Stimulation of physiological functions in young basil plants under either applied UV-B dose resulted in increased total chlorophyll content but no marked variation in carotenoid content”
Claim · model-written summary
Applied UV-B dose did not markedly change carotenoid content in young basil plants.
- Taxon
- basilOcimum basilicume1
- Treatment
- applied UV-B dosee1
- Outcome
- carotenoid contente1
- Direction
- no marked variatione1
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e1“Stimulation of physiological functions in young basil plants under either applied UV-B dose resulted in increased total chlorophyll content but no marked variation in carotenoid content”
Claim · model-written summary
Supplementary UV-B decreased chlorophyll and carotenoid contents of basil at the flowering stage, with greater decrease at higher exposure.
- Taxon
- basilOcimum basilicume2
- Organ / stage
- flowering stagee2
- Treatment
- supplementary UV-B radiatione2
- Outcome
- chlorophyll and carotenoid contentse2
- Direction
- decreasinge2
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e2“At the flowering stage the chlorophyll and carotenoid contents of basil were affected by supplementary UV-B radiation, decreasing with enhanced UV-B exposure”
Claim · model-written summary
UV-B light supplementation increased total antioxidant activity of basil.
- Taxon
- basilOcimum basilicume0
- Treatment
- UV-B light supplementatione3
- Outcome
- total antioxidant activitye3
- Direction
- increasede3
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Exposure of basil plants to supplementary UV-B light resulted in increased assimilating leaf area, fresh biomass and dry biomass”
e3“Both total antioxidant activity (2,2-diphenyl-1-picrylhydrazyl free radical assay) and total phenolic compound content were increased by UV-B light supplementation”
Claim · model-written summary
UV-B light supplementation increased total phenolic compound content of basil.
- Taxon
- basilOcimum basilicume0
- Treatment
- UV-B light supplementatione3
- Outcome
- total phenolic compound contente3
- Direction
- increasede3
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Exposure of basil plants to supplementary UV-B light resulted in increased assimilating leaf area, fresh biomass and dry biomass”
e3“Both total antioxidant activity (2,2-diphenyl-1-picrylhydrazyl free radical assay) and total phenolic compound content were increased by UV-B light supplementation”
Claim · model-written summary
Young and mature basil plants differed in ascorbic acid content, which depended on UV-B dose and plant age.
- Taxon
- basilOcimum basilicume4
- Treatment
- UV-B dosee4
- Outcome
- ascorbic acid contente4
- Qualifier
- plant agee4
Not reportedDirection
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e4“Young and mature basil plants differed in their ascorbic acid content, which was dependent on UV-B dose and plant age”
Claim · model-written summary
UV-B radiation decreased nitrate content in young basil plants at the 3-4 leaf pair stage.
- Taxon
- basilOcimum basilicume5
- Organ / stage
- young basil plantse5
- Treatment
- UV-B radiatione5
- Outcome
- nitrate contente5
- Direction
- decreasede5
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e5“UV-B radiation resulted in decreased nitrate content in young basil plants (3-4 leaf pair stage)”
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