Abstract
Due to anthropogenic destruction of stratospheric ozone, UV-B radiation is projected to increase in the near future. Other potential global climate changes in temperature and precipitation patterns raise the need for research into plant responses to multiple environmental stresses. The objective of this study was to document UV-B and water stress effects on gas exchange of soybean (Glycine max Merr.) under two nitrogen levels. Two soybean cultivars differing in sensitivity to UV-B were tested at fluence rates of 19.1 or 8.5 kJ m[sub [minus]2]day[sub [minus]1] (enhance and natural levels of UV-B, respectively). Measurements of photosaturated CO[sub 2] uptake at ambient CO[sub 2] (A). stomatal conductance. photosaturated O[sub 2] evolution at saturating CO[sub 2] (A[sub max]), long term water use efficiency (using [delta][sup 13]C), and nitrogen fixation (using [sup 15]N) were performed. No significant treatment effects on A could be detected. However A[sub max] was significantly increased, and stomatal conductance reduced (p<0.01) by increased UV-B at all levels of water and nitrogen for both cultivars, suggesting a stronger stomal limitation of photosynthesis under UV-B. Water and nitrogen use efficiency also decreased under increased UV-B in both cultivars (p<0.01).
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Claims 6
Claim · model-written summary
Treatments had no statistically detectable effect on photosaturated CO2 uptake at ambient CO2.
- Taxon
- soybeans
Glycine maxt0 - Treatment
- increased UV-Be2
- Outcome
- photosaturated CO[sub 2] uptake at ambient CO[sub 2]e1
Not reportedComparatorDirection
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“No significant treatment effects on A could be detected.”
e1“photosaturated CO[sub 2] uptake at ambient CO[sub 2] (A)”
e2“increased UV-B at all levels of water and nitrogen for both cultivars”
t0“soybeans”
Claim · model-written summary
Increased UV-B significantly increased photosaturated O2 evolution at saturating CO2 across water and nitrogen levels in both cultivars.
- Taxon
- soybeansGlycine maxt0
- Treatment
- increased UV-Be0
- Outcome
- photosaturated O[sub 2] evolution at saturating CO[sub 2]e1
- Direction
- increasede0
- Qualifier
- at all levels of water and nitrogen for both cultivarse0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“A[sub max] was significantly increased, and stomatal conductance reduced (p<0.01) by increased UV-B at all levels of water and nitrogen for both cultivars”
e1“photosaturated O[sub 2] evolution at saturating CO[sub 2] (A[sub max])”
t0“soybeans”
Claim · model-written summary
Increased UV-B significantly reduced stomatal conductance across water and nitrogen levels in both cultivars.
- Taxon
- soybeansGlycine maxt0
- Treatment
- increased UV-Be0
- Outcome
- stomatal conductancee0
- Direction
- reducede0
- Qualifier
- at all levels of water and nitrogen for both cultivarse0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“stomatal conductance reduced (p<0.01) by increased UV-B at all levels of water and nitrogen for both cultivars”
t0“soybeans”
Claim · model-written summary
Water use efficiency decreased under increased UV-B in both cultivars.
- Taxon
- soybeansGlycine maxt0
- Treatment
- increased UV-Be0
- Outcome
- Watere0
- Direction
- decreasede0
- Qualifier
- in both cultivarse0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Water and nitrogen use efficiency also decreased under increased UV-B in both cultivars (p<0.01)”
t0“soybeans”
Claim · model-written summary
Nitrogen use efficiency decreased under increased UV-B in both cultivars.
- Taxon
- soybeansGlycine maxt0
- Treatment
- increased UV-Be0
- Outcome
- nitrogen use efficiencye0
- Direction
- decreasede0
- Qualifier
- in both cultivarse0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Water and nitrogen use efficiency also decreased under increased UV-B in both cultivars (p<0.01)”
t0“soybeans”
Claim · model-written summary
The authors interpret the UV-B gas exchange response as stronger stomatal limitation of photosynthesis.
- Taxon
- soybeansGlycine maxt0
- Treatment
- UV-Be0
- Outcome
- stomal limitation of photosynthesise0
- Direction
- strongere0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“suggesting a stronger stomal limitation of photosynthesis under UV-B”
t0“soybeans”
The same questions in other papers
uv · physiology: gas exchange · Glycine max (soybean)Positive and negative results
6 papers in the same direction as this paper · 1 in the opposite direction
- positive
- no effect
- negative
4 papers more in this group
See all 8 papers →uv · nutrient: content · Glycine max (soybean)Results agree
2 papers in the same direction as this paper
- negative
- negative
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.