Abstract
Few studies have considered ethylene involvement in plant responses to ultraviolet-B (UVB) radiation. We studied the responses to UVB radiation of one wild-type (WT, ‘Westar’) canola (Brassica napus L.) with normal ethylene evolution and two transgenic (C1, C2) lines with lower ethylene evolution. Canola plants were grown under biologically effective levels of UVB (UVB BE ) radiation: 0.03 (low), 4.88 (medium), and 9.78 (high) kJ·m –2 ·d –1 in controlled-environment growth chambers. The growth and physiological parameters of the plants were measured. Of the two transgenic lines, C1 demonstrated higher ethylene evolution than C2 but lower than WT. The lowest aboveground and belowground biomass was found with exposure to high UVB radiation. WT produced more biomass than C2. Net CO 2 assimilation and transpiration did not vary among plant lines or UVB treatments. Water-use efficiency was lower under high UVB radiation than under low UVB. The quantum yield of photosystem II was higher for C2 than for either WT or C1. WT did not differ from transgenic plants in respect to photosynthetic pigments and UV-screening compounds. Photosynthetic pigment concentration decreased, but concentration of UV-screening compounds, thickness of epicuticular wax, and the rate of root hydraulic conductance were increased by exposure to UVB radiation. While there appears to be a lack of ethylene involvement in some of the measured physiological parameters, the transgenic plants exhibited differential sensitivity to UVB in a few key measured parameters.
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Claims 9
Claim · model-written summary
C1 evolved more ethylene than C2 but less than WT.
- Taxon
- canola
.jpg?width=60)
Brassica napus var. napust0 - Material
- C1e0
- Outcome
- ethylene evolutione0
- Direction
- highere0
- Comparator
- C2e0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
.jpg?width=500)
Verbatim
e0“C1 demonstrated higher ethylene evolution than C2 but lower than WT”
t0“canola”
Claim · model-written summary
High UVB yielded the lowest aboveground and belowground biomass.
- Taxon
- canolaBrassica napus var. napust0
- Treatment
- high UVB radiatione0
- Outcome
- aboveground and belowground biomasse0
- Direction
- loweste0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“The lowest aboveground and belowground biomass was found with exposure to high UVB radiation”
t0“canola”
Claim · model-written summary
WT produced more biomass than C2.
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“WT produced more biomass than C2”
t0“canola”
Claim · model-written summary
Net CO2 assimilation and transpiration did not vary across lines or UVB treatments.
- Taxon
- canolaBrassica napus var. napust0
- Treatment
- UVB treatmentse0
- Outcome
- Net CO 2 assimilation and transpiratione0
- Direction
- did not varye0
- Comparator
- plant linese0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Net CO 2 assimilation and transpiration did not vary among plant lines or UVB treatments”
t0“canola”
Claim · model-written summary
Water-use efficiency was lower under high than low UVB.
- Taxon
- canolaBrassica napus var. napust0
- Treatment
- high UVB radiatione0
- Outcome
- Water-use efficiencye0
- Direction
- lowere0
- Comparator
- low UVBe0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Water-use efficiency was lower under high UVB radiation than under low UVB”
t0“canola”
Claim · model-written summary
C2 had higher photosystem II quantum yield than WT or C1.
- Taxon
- canolaBrassica napus var. napust0
- Material
- C2e0
- Outcome
- quantum yield of photosystem IIe0
- Direction
- highere0
- Comparator
- WT or C1e0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“The quantum yield of photosystem II was higher for C2 than for either WT or C1”
t0“canola”
Claim · model-written summary
WT and transgenic plants did not differ in pigments or UV-screening compounds.
- Taxon
- canolaBrassica napus var. napust0
- Material
- WTe0
- Outcome
- photosynthetic pigments and UV-screening compoundse0
- Direction
- did not differe0
- Comparator
- transgenic plantse0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“WT did not differ from transgenic plants in respect to photosynthetic pigments and UV-screening compounds”
t0“canola”
Claim · model-written summary
UVB decreased photosynthetic pigment concentration.
- Taxon
- canolaBrassica napus var. napust0
- Treatment
- UVB radiatione0
- Outcome
- Photosynthetic pigment concentratione0
- Direction
- decreasede0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Photosynthetic pigment concentration decreased, but concentration of UV-screening compounds, thickness of epicuticular wax, and the rate of root hydraulic conductance were increased by exposure to UVB radiation”
t0“canola”
Claim · model-written summary
UVB increased UV-screening compounds, epicuticular wax thickness and root hydraulic conductance.
- Taxon
- canolaBrassica napus var. napust0
- Treatment
- UVB radiatione0
- Outcome
- concentration of UV-screening compounds, thickness of epicuticular wax, and the rate of root hydraulic conductancee0
- Direction
- increasede0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“concentration of UV-screening compounds, thickness of epicuticular wax, and the rate of root hydraulic conductance were increased by exposure to UVB radiation”
t0“canola”
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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.