Abstract
This study aimed to evaluate short-duration (24 h) UV-B irradiation as a preharvest abiotic stressor in canola plants. Moreover, we quantified the expression levels of genes related to bioactive compounds synthesis in response to UV-B radiation. Canola seedlings were cultivated in a plant factory under artificial light (200 μmol m –2 s –1 photosynthetic photon flux density; white LED lamps; 16 h on/8 h off), 25°C/20°C daytime/nighttime air temperature, and 70% relative humidity. Eighteen days after sowing, the seedlings were subjected to supplemental UV-B treatment. The control plants received no UV-B irradiation. The plants were exposed to 3, 5, or 7 W m –2 UV-B irradiation. There were no significant differences in shoot fresh weight between the UV-B-irradiated and control plants. With increasing UV-B irradiation intensity and exposure time, the H 2 O 2 content gradually increased, the expression levels of genes related to photosynthesis downregulated, and phenylpropanoid and flavonoid production, and also total phenolic, flavonoid, antioxidant, and anthocyanin concentrations were significantly enhanced. The genes related to secondary metabolite biosynthesis were immediately upregulated after UV-B irradiation. The relative gene expression patterns identified using qRT-PCR corroborated the variations in gene expression that were revealed using microarray analysis. The time point at which the genes were induced varied with the gene location along the biosynthetic pathway. To the best of our knowledge, this is the first study to demonstrate a temporal difference between the accumulation of antioxidants and the induction of genes related to the synthesis of this compound in UV-B-treated canola plants. Our results demonstrated that short-term UV-B irradiation could augment antioxidant biosynthesis in canola without sacrificing crop yield or quality.
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Claims 10
Claim · model-written summary
Shoot fresh weight did not differ between UV-B-irradiated and control canola plants.
- Taxon
- Canola (Brassica napus)
_Brassica_napus_-_Habit.jpg?width=60)
Brassica napust0 - Treatment
- UV-B-irradiatede1
- Outcome
- shoot fresh weighte1
- Direction
- no_changeinferrede1
- Comparator
- control plantse1
- Setting
- Plant Factory With Artificial Lightt0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
_Brassica_napus_-_Habit.jpg?width=500)
Verbatim
t0“Canola (Brassica napus) Under Different UV-B Irradiation Levels in a Plant Factory With Artificial Light”
e1“There were no significant differences in shoot fresh weight between the UV-B-irradiated and control plants”
Claim · model-written summary
With increasing UV-B intensity and exposure time, H2O2 content increased in canola.
- Taxon
- Canola (Brassica napus)Brassica napust0
- Treatment
- With increasing UV-B irradiation intensity and exposure timee3
- Outcome
- H 2 O 2 contente3
- Direction
- increasede3
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
t0“Canola (Brassica napus) Under Different UV-B Irradiation Levels in a Plant Factory With Artificial Light”
e3“With increasing UV-B irradiation intensity and exposure time, the H 2 O 2 content gradually increased”
Claim · model-written summary
With increasing UV-B intensity and exposure time, expression of photosynthesis-related genes was downregulated in canola.
- Taxon
- Canola (Brassica napus)Brassica napust0
- Treatment
- With increasing UV-B irradiation intensity and exposure timee3
- Outcome
- expression levels of genes related to photosynthesise4
- Direction
- downregulatede4
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
t0“Canola (Brassica napus) Under Different UV-B Irradiation Levels in a Plant Factory With Artificial Light”
e3“With increasing UV-B irradiation intensity and exposure time, the H 2 O 2 content gradually increased”
e4“the expression levels of genes related to photosynthesis downregulated”
Claim · model-written summary
With increasing UV-B intensity and exposure time, phenylpropanoid and flavonoid production was significantly enhanced in canola.
- Taxon
- Canola (Brassica napus)Brassica napust0
- Treatment
- With increasing UV-B irradiation intensity and exposure timee3
- Outcome
- phenylpropanoid and flavonoid productione2
- Direction
- significantly enhancede2
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
t0“Canola (Brassica napus) Under Different UV-B Irradiation Levels in a Plant Factory With Artificial Light”
e2“phenylpropanoid and flavonoid production, and also total phenolic, flavonoid, antioxidant, and anthocyanin concentrations were significantly enhanced”
e3“With increasing UV-B irradiation intensity and exposure time, the H 2 O 2 content gradually increased”
Claim · model-written summary
With increasing UV-B intensity and exposure time, total phenolic, flavonoid and antioxidant concentrations were significantly enhanced in canola.
- Taxon
- Canola (Brassica napus)Brassica napust0
- Treatment
- With increasing UV-B irradiation intensity and exposure timee3
- Outcome
- total phenolic, flavonoid, antioxidante2
- Direction
- significantly enhancede2
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
t0“Canola (Brassica napus) Under Different UV-B Irradiation Levels in a Plant Factory With Artificial Light”
e2“phenylpropanoid and flavonoid production, and also total phenolic, flavonoid, antioxidant, and anthocyanin concentrations were significantly enhanced”
e3“With increasing UV-B irradiation intensity and exposure time, the H 2 O 2 content gradually increased”
Claim · model-written summary
With increasing UV-B intensity and exposure time, anthocyanin concentration was significantly enhanced in canola.
- Taxon
- Canola (Brassica napus)Brassica napust0
- Treatment
- With increasing UV-B irradiation intensity and exposure timee3
- Outcome
- anthocyanin concentrationse2
- Direction
- significantly enhancede2
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
t0“Canola (Brassica napus) Under Different UV-B Irradiation Levels in a Plant Factory With Artificial Light”
e2“phenylpropanoid and flavonoid production, and also total phenolic, flavonoid, antioxidant, and anthocyanin concentrations were significantly enhanced”
e3“With increasing UV-B irradiation intensity and exposure time, the H 2 O 2 content gradually increased”
Claim · model-written summary
Genes related to secondary metabolite biosynthesis were upregulated immediately after UV-B irradiation in canola.
- Taxon
- Canola (Brassica napus)Brassica napust0
- Treatment
- UV-B irradiatione5
- Outcome
- genes related to secondary metabolite biosynthesise5
- Direction
- upregulatede5
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
t0“Canola (Brassica napus) Under Different UV-B Irradiation Levels in a Plant Factory With Artificial Light”
e5“The genes related to secondary metabolite biosynthesis were immediately upregulated after UV-B irradiation”
Claim · model-written summary
The time point at which secondary metabolite genes were induced varied with their location along the biosynthetic pathway.
- Taxon
- Canola (Brassica napus)Brassica napust0
- Outcome
- The time point at which the genes were inducede6
- Qualifier
- varied with the gene location along the biosynthetic pathwaye6
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
t0“Canola (Brassica napus) Under Different UV-B Irradiation Levels in a Plant Factory With Artificial Light”
e6“The time point at which the genes were induced varied with the gene location along the biosynthetic pathway”
Claim · model-written summary
A temporal difference was found between antioxidant accumulation and induction of related genes in UV-B-treated canola.
- Taxon
- Canola (Brassica napus)Brassica napust0
- Outcome
- a temporal difference between the accumulation of antioxidants and the induction of genese7
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
t0“Canola (Brassica napus) Under Different UV-B Irradiation Levels in a Plant Factory With Artificial Light”
e7“a temporal difference between the accumulation of antioxidants and the induction of genes related to the synthesis of this compound in UV-B-treated canola plants”
Claim · model-written summary
Short-term UV-B irradiation could augment antioxidant biosynthesis in canola without sacrificing crop yield or quality.
- Taxon
- Canola (Brassica napus)Brassica napust0
- Treatment
- short-term UV-B irradiatione7
- Outcome
- antioxidant biosynthesise7
- Qualifier
- without sacrificing crop yield or qualitye7
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
t0“Canola (Brassica napus) Under Different UV-B Irradiation Levels in a Plant Factory With Artificial Light”
e7“Our results demonstrated that short-term UV-B irradiation could augment antioxidant biosynthesis in canola without sacrificing crop yield or quality”
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