Abstract
Experiments were conducted under greenhouse conditions to investigate the effects of enhanced UV‐B radiation (280 to 320 nm) on height, fresh and dry weights, leaf chlorophyll and carotenoids, CO 2 uptake rates, and Hill activity in soybean ( Glycine max L. cv. Bragg). Plants were exposed for 6 h continuously from midmorning to midafternoon each day to UV‐B radiation which was provided by Westinghouse FS‐40 sun lamps filtered with 0.127‐mm cellulose acetate film (UV‐B enhanced) or 0.127‐mm Mylar S film (UV‐B Mylar control). Three different UV‐B enhanced radiation levels were tested: 1.09 (treatment T 1 ), 1.36 (treatment T 2 ), and 1.83 (treatment T 3 ) UV‐B sun equivalent units (UV‐B sec ) where 1 UV‐B sec = 15.98 mW·m −2 of solar UV‐B obtained by applying EXP ‐[(α‐265)/21] 2 , a weighting function that simulates the DNA absorption spectrum, to the UV‐B lamp systems. These UV‐B levels correspond to a calculated decrease in stratospheric ozone content of 6%, 21%, and 36% for treatment T 1 , T 2 , and T 3 , respectively. Daily exposure of soybean plants to UV‐B radiation significantly decreased height, fresh and dry weights, leaf chlorophyll and carotenoid contents, and CO 2 uptake rates. Leaf pigment extracted in 80% acetone from UV‐B‐treated soybean plants showed considerable increase in absorption in the wavelength region of 330 to 400 nm with increased UV‐B radiation levels. Chloroplast preparations from leaves of T 2 and T 3 plants showed significant reductions in Hill reaction measurements.
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Claims 5
Claim · model-written summary
Daily UV-B exposure significantly decreased soybean height and fresh and dry weights.
- Taxon
- soybean
Glycine maxe0 - Treatment
- UV‐B radiatione0
- Outcome
- height, fresh and dry weightse0
- Direction
- decreasede0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Daily exposure of soybean plants to UV‐B radiation significantly decreased height, fresh and dry weights, leaf chlorophyll and carotenoid contents, and CO 2 uptake rates.”
Claim · model-written summary
Daily UV-B exposure significantly decreased leaf chlorophyll and carotenoid contents.
- Taxon
- soybeanGlycine maxe0
- Treatment
- UV‐B radiatione0
- Outcome
- leaf chlorophyll and carotenoid contentse0
- Direction
- decreasede0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Daily exposure of soybean plants to UV‐B radiation significantly decreased height, fresh and dry weights, leaf chlorophyll and carotenoid contents, and CO 2 uptake rates.”
Claim · model-written summary
Daily UV-B exposure significantly decreased soybean CO2 uptake rates.
- Taxon
- soybeanGlycine maxe0
- Treatment
- UV‐B radiatione0
- Outcome
- CO 2 uptake ratese0
- Direction
- decreasede0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Daily exposure of soybean plants to UV‐B radiation significantly decreased height, fresh and dry weights, leaf chlorophyll and carotenoid contents, and CO 2 uptake rates.”
Claim · model-written summary
Leaf pigment absorption at 330 to 400 nm increased with higher UV-B levels.
- Taxon
- soybeanGlycine maxe0
- Treatment
- UV‐Be0
- Outcome
- absorption in the wavelength region of 330 to 400 nme0
- Direction
- increasee0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Leaf pigment extracted in 80% acetone from UV‐B‐treated soybean plants showed considerable increase in absorption in the wavelength region of 330 to 400 nm with increased UV‐B radiation levels.”
Claim · model-written summary
Hill reaction measurements fell significantly in chloroplasts from T2 and T3 plants.
- Taxon
- soybeanGlycine maxe1
- Organ / stage
- leavese0
- Treatment
- T 2 and T 3e0
- Outcome
- Hill reaction measurementse0
- Direction
- reductionse0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Chloroplast preparations from leaves of T 2 and T 3 plants showed significant reductions in Hill reaction measurements.”
e1“soybean ( Glycine max L. cv. Bragg)”
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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.