Abstract
Twenty‐two cultivars of rice ( Oryza sativa L.) from diverse origins were grown under greenhouse conditions and exposed to ultraviolet‐B radiation (UV‐B; 280‐320 nm) simulating a 5% reduction in stratospheric ozone in spring for the Philippines (14° N lat.) to evaluate growth and morphological responses to UV‐B. In comparison to controls that received no UV‐B, plants exposed to UV‐B exhibited significantly reduced dry matter production (total plant and shoot), shoot height, leaf blade length and total leaf area, increased number of tillers, and greater weight fractions in leaf blades and roots. For most cultivars, the relative effects of UV‐B on shoot morphology were greater than the effects on biomass production. The direction of the UV‐B effects were generally similar for all cultivars, however, there were significant differences among cultivars in the magnitude of the UV‐Binduced changes. Upland cultivars (IRAT104 and OS4) and two lowland cultivars commonly planted in the USA (Star Bonnet and Lemont) were found to be least affected by the UV‐B, whereas modern, high yielding, lowland cultivars developed in the Philippines (IR52, IR35546‐17‐33, and IR58) were found to be among the most sensitive to UV‐B. Our results indicate that in rice, as in other grasses, shoot morphology may be more responsive to solar UV‐B change than plant productivity. Intraspecific variation in morphological responses to UVB could contribute to differences among cultivars in susceptibility to UV‐B‐induced changes in competitive balance between rice and associated weeds of the rice agroecosystem.
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Claims 8
Claim · model-written summary
UV-B reduced total plant and shoot dry matter, shoot height, and leaf blade length.
- Taxon
- rice
Oryza sativae1 - Treatment
- exposed to UV‐Be0
- Outcome
- dry matter production (total plant and shoot), shoot height, leaf blade lengthe0
- Direction
- reducede0
- Comparator
- controls that received no UV‐Be0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“In comparison to controls that received no UV‐B, plants exposed to UV‐B exhibited significantly reduced dry matter production (total plant and shoot), shoot height, leaf blade length and total leaf area”
e1“cultivars of rice ( Oryza sativa L.)”
Claim · model-written summary
UV-B reduced total leaf area.
- Taxon
- riceOryza sativae1
- Treatment
- exposed to UV‐Be0
- Outcome
- total leaf areae0
- Direction
- reducede0
- Comparator
- controls that received no UV‐Be0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“In comparison to controls that received no UV‐B, plants exposed to UV‐B exhibited significantly reduced dry matter production (total plant and shoot), shoot height, leaf blade length and total leaf area”
e1“cultivars of rice ( Oryza sativa L.)”
Claim · model-written summary
UV-B increased tiller number and leaf blade and root weight fractions.
- Taxon
- riceOryza sativae2
- Treatment
- exposed to UV‐Be1
- Outcome
- number of tillers, and greater weight fractions in leaf blades and rootse0
- Direction
- increasede0
- Comparator
- controls that received no UV‐Be1
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“increased number of tillers, and greater weight fractions in leaf blades and roots.”
e1“In comparison to controls that received no UV‐B, plants exposed to UV‐B”
e2“cultivars of rice ( Oryza sativa L.)”
Claim · model-written summary
For most cultivars, UV-B effects on shoot morphology exceeded effects on biomass.
- Taxon
- riceOryza sativae1
- Treatment
- UV‐Be0
- Outcome
- relative effects of UV‐B on shoot morphologye0
- Direction
- greatere0
- Comparator
- effects on biomass productione0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“For most cultivars, the relative effects of UV‐B on shoot morphology were greater than the effects on biomass production.”
e1“cultivars of rice ( Oryza sativa L.)”
Claim · model-written summary
Cultivars differed significantly in the magnitude of UV-B responses.
- Taxon
- riceOryza sativae1
- Outcome
- differences among cultivars in the magnitude of the UV‐Binduced changese0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“there were significant differences among cultivars in the magnitude of the UV‐Binduced changes.”
e1“cultivars of rice ( Oryza sativa L.)”
Claim · model-written summary
IRAT104 and OS4 were among the least affected cultivars.
- Taxon
- riceOryza sativae1
- Material
- IRAT104 and OS4e0
- Outcome
- least affected by the UV‐Be0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Upland cultivars (IRAT104 and OS4) and two lowland cultivars commonly planted in the USA (Star Bonnet and Lemont) were found to be least affected by the UV‐B”
e1“cultivars of rice ( Oryza sativa L.)”
Claim · model-written summary
Star Bonnet and Lemont were among the least affected cultivars.
- Taxon
- riceOryza sativae1
- Material
- Star Bonnet and Lemonte0
- Outcome
- least affected by the UV‐Be0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Upland cultivars (IRAT104 and OS4) and two lowland cultivars commonly planted in the USA (Star Bonnet and Lemont) were found to be least affected by the UV‐B”
e1“cultivars of rice ( Oryza sativa L.)”
Claim · model-written summary
IR52, IR35546‐17‐33, and IR58 were among the most UV-B sensitive cultivars.
- Taxon
- riceOryza sativae1
- Material
- IR52, IR35546‐17‐33, and IR58e0
- Outcome
- most sensitive to UV‐Be0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“IR52, IR35546‐17‐33, and IR58) were found to be among the most sensitive to UV‐B.”
e1“cultivars of rice ( Oryza sativa L.)”
The same questions in other papers
uv · yield · Oryza sativa (rice)Results differ
12 papers in the same direction as this paper · 2 in the opposite direction
- negative
- no effect
- no effect
11 papers more in this group
See all 15 papers →uv · growth · Oryza sativa (rice)Results differ
20 papers in the same direction as this paper · 6 in the opposite direction
- positive
- negative
- no effect
23 papers more in this group
See all 27 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.