Abstract
Abstract— Different cultivars of maize ( Zea mays L.) originating from Central and South Europe were grown from June to September 1994 for 16 weeks in two greenhouses covered with different UVB‐absorbing (280–320 nm) plastic foils. Using the ambient UVB radiation level of a southern location (Portugal, 38.7°N) in one of the greenhouses as an enhanced radiation compared to the reduced radiation in the second greenhouse, an increase of about 12% of UVB was simulated. Six of the eight cultivars examined showed significant reductions in height of up to 18.9% at all developmental stages under increased UVB. In contrast to this, the fresh and dry weight as well as the leaf area was reduced under UVB only at early developmental stages, but with ongoing development the UVB stressed plants caught up. The total content of absorbing compounds of the maize cultivars was completely unaffected by UVB. A flowering delay up to a maximum of 5 days was observed under higher UVB in several cultivars. Probably due to this delay in the cob development the yield decreased to 27.7% under higher UVB at the first harvest after 12 and 14 weeks, whereas at the second harvest after 14 and 16 weeks yield reduction levelled off.
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Claims 7
Claim · model-written summary
Height fell by up to 18.9% in six of eight cultivars under increased UVB at all developmental stages.
- Treatment
- increased UVBe0
- Outcome
- heighte0
- Direction
- reductionse0
- Value
- up to 18.9%e0
- Qualifier
- Six of the eight cultivars examinede0
Zea maysNot reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Six of the eight cultivars examined showed significant reductions in height of up to 18.9% at all developmental stages under increased UVB”
e1“cultivars of maize ( Zea mays L.)”
Claim · model-written summary
Fresh and dry weight fell under UVB only at early stages, after which stressed plants caught up.
- Treatment
- UVBe0
- Outcome
- fresh and dry weighte0
- Direction
- reducede0
- Qualifier
- only at early developmental stagese0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“the fresh and dry weight as well as the leaf area was reduced under UVB only at early developmental stages, but with ongoing development the UVB stressed plants caught up”
e1“cultivars of maize ( Zea mays L.)”
Claim · model-written summary
Leaf area fell under UVB only at early stages, after which stressed plants caught up.
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“the fresh and dry weight as well as the leaf area was reduced under UVB only at early developmental stages, but with ongoing development the UVB stressed plants caught up”
e1“cultivars of maize ( Zea mays L.)”
Claim · model-written summary
UVB did not affect total content of absorbing compounds.
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“The total content of absorbing compounds of the maize cultivars was completely unaffected by UVB”
Claim · model-written summary
Higher UVB delayed flowering by up to five days in several cultivars.
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“A flowering delay up to a maximum of 5 days was observed under higher UVB in several cultivars”
e1“cultivars of maize ( Zea mays L.)”
Claim · model-written summary
Higher UVB reduced yield to 27.7% at the first harvest after 12 and 14 weeks.
- Treatment
- higher UVBe0
- Outcome
- yielde0
- Direction
- decreasede0
- Value
- 27.7%e0
- Qualifier
- at the first harvest after 12 and 14 weekse0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“the yield decreased to 27.7% under higher UVB at the first harvest after 12 and 14 weeks”
e1“cultivars of maize ( Zea mays L.)”
Claim · model-written summary
Yield reduction levelled off at the second harvest after 14 and 16 weeks.
Not reportedTreatmentComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“at the second harvest after 14 and 16 weeks yield reduction levelled off”
e1“cultivars of maize ( Zea mays L.)”
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