Abstract
Rapeseed (Brassica napus L.) is sensitive to light quality. The factory production of rapeseed seedlings for vegetable use and for transplanting in the field requires an investigation of the responses of rapeseed to light quality. This study evaluated the responses of the leaf of rapeseed (cv. "Zhongshuang 11") to different ratios of red-photonflux (RPF) and blue-photonflux (BPF) from light emitting diodes (LEDs). The treatments were set as monochromatic lights, including 100R:0B% and 0R:100B%, and compound lights (CLs), including 75R:25B%, 50R:50B%, and 25R:75B%. The total photonflux in all of the treatments was set as 550 μmolm(-2)s(-1). With an increase of BPF, the rapeseed leaves changed from wrinkled blades and down-rolled margins to flat blades and slightly up-rolled margins, and the compact degree of palisade tissue increased. One layer of the cells of palisade tissue was present under 100R:0B%, whereas two layers were present under the other treatments. Compared to 100R:0B%, 0R:100B% enhanced the indexes of leaf thickness, leaf mass per area (LMA), stomatal density, chlorophyll (Chl) content per weight and photosynthetic capacity (P max), and the CLs with high BPF ratios enhanced these indexes. However, the 100R:0B% and CLs with high RPF ratios enhanced the net photosynthetic rate (P n). The leaves under the CLs showed growth vigor, whereas the leaves under 100R:0B% or 0R:100B% were stressed with a low F v/F m (photosynthetic maximum quantum yield) and a high content of [Formula: see text] and H2O2. The top second leaves under 100R:0B% or 0R:100B% showed stress resistance responses with a high activity of antioxidase, but the top third leaves showed irreversible damage and inactivity of antioxidase. Our results showed that the rapeseed leaves grown under 0R:100B% or CLs with a high BPF ratio showed higher ability to utilize high photonflux, while the leaves grown under 100R:0B% or CLs with a low BPF ratio showed higher efficiency in utilizing low photonflux. Under different R:B photonflux ratios, red and blue lights may play mutual roles in P n. When the blue light dominated, the P n showed a B-preference. When the red light dominated, the P n showed an R-preference. Furthermore, CLs were suitable for the P n of rapeseed seedlings.
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Claims 15
Claim · model-written summary
Increasing blue photon flux changed leaf blades and margins from wrinkled and down-rolled to flat and slightly up-rolled.
- Taxon
- rapeseede0
- Treatment
- increase of BPFe0
- Outcome
- flat blades and slightly up-rolled marginse0
- Comparator
- wrinkled blades and down-rolled marginse0
Not reportedDirection
Verbatim
e0“With an increase of BPF, the rapeseed leaves changed from wrinkled blades and down-rolled margins to flat blades and slightly up-rolled margins”
Claim · model-written summary
Increasing blue photon flux increased palisade tissue compactness.
- Taxon
- rapeseede0
- Treatment
- increase of BPFe0
- Outcome
- compact degree of palisade tissuee0
- Direction
- increasede0
Not reportedComparator
Verbatim
e0“With an increase of BPF, the rapeseed leaves changed from wrinkled blades and down-rolled margins to flat blades and slightly up-rolled margins, and the compact degree of palisade tissue increased”
Claim · model-written summary
Palisade tissue had one cell layer under 100R:0B% and two under the other treatments.
- Taxon
- Rapeseedt0
- Treatment
- 100R:0B%e0
- Outcome
- layer of the cells of palisade tissuee0
- Value
- One layere0
- Comparator
- other treatmentse0
Not reportedDirection
Verbatim
e0“One layer of the cells of palisade tissue was present under 100R:0B%, whereas two layers were present under the other treatments”
t0“Rapeseed”
Claim · model-written summary
Blue light and high blue compound lights enhanced leaf thickness, LMA and stomatal density.
Verbatim
e0“Compared to 100R:0B%, 0R:100B% enhanced the indexes of leaf thickness, leaf mass per area (LMA), stomatal density, chlorophyll (Chl) content per weight and photosynthetic capacity (P max), and the CLs with high BPF ratios enhanced these indexes”
t0“Rapeseed”
Claim · model-written summary
Blue light and high blue compound lights enhanced chlorophyll content and photosynthetic capacity.
Verbatim
e0“Compared to 100R:0B%, 0R:100B% enhanced the indexes of leaf thickness, leaf mass per area (LMA), stomatal density, chlorophyll (Chl) content per weight and photosynthetic capacity (P max), and the CLs with high BPF ratios enhanced these indexes”
t0“Rapeseed”
Claim · model-written summary
Red light and high red compound lights enhanced net photosynthetic rate.
- Taxon
- Rapeseedt0
- Treatment
- 100R:0B% and CLs with high RPF ratiose0
- Outcome
- net photosynthetic rate (P n)e0
- Direction
- enhancede0
Not reportedComparator
Verbatim
e0“the 100R:0B% and CLs with high RPF ratios enhanced the net photosynthetic rate (P n)”
t0“Rapeseed”
Claim · model-written summary
Leaves under compound lights showed growth vigor.
Verbatim
e0“The leaves under the CLs showed growth vigor”
t0“Rapeseed”
Claim · model-written summary
Monochromatic red or blue leaves showed low F v/F m and high stress compounds.
Verbatim
e0“the leaves under 100R:0B% or 0R:100B% were stressed with a low F v/F m (photosynthetic maximum quantum yield) and a high content of [Formula: see text] and H2O2”
t0“Rapeseed”
Claim · model-written summary
Monochromatic red or blue top second leaves had high antioxidase activity.
Verbatim
e0“The top second leaves under 100R:0B% or 0R:100B% showed stress resistance responses with a high activity of antioxidase”
t0“Rapeseed”
Claim · model-written summary
Monochromatic red or blue top third leaves showed irreversible damage and antioxidase inactivity.
Verbatim
e0“the top third leaves showed irreversible damage and inactivity of antioxidase”
t0“Rapeseed”
Claim · model-written summary
Blue light or high blue compound lights gave greater ability to use high photon flux.
Verbatim
e0“the rapeseed leaves grown under 0R:100B% or CLs with a high BPF ratio showed higher ability to utilize high photonflux”
Claim · model-written summary
Red light or low blue compound lights gave greater efficiency at low photon flux.
Verbatim
e0“the leaves grown under 100R:0B% or CLs with a low BPF ratio showed higher efficiency in utilizing low photonflux”
t0“Rapeseed”
Claim · model-written summary
Net photosynthetic rate preferred blue light when blue dominated.
Not reportedDirection
Verbatim
e0“When the blue light dominated, the P n showed a B-preference”
t0“Rapeseed”
Claim · model-written summary
Net photosynthetic rate preferred red light when red dominated.
Not reportedDirection
Verbatim
e0“When the red light dominated, the P n showed an R-preference”
t0“Rapeseed”
Claim · model-written summary
Compound lights were considered suitable for seedling net photosynthetic rate.
Verbatim
e0“CLs were suitable for the P n of rapeseed seedlings”
The same questions in other papers
light · physiology: photosynthesis · Brassica napus (oilseed rape)Positive and negative results
4 papers in the same direction as this paper · 3 in the opposite direction
- positive
- no effect
- negative
4 papers more in this group
See all 8 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.