Abstract
SUMMARY The increase of ultraviolet (UV-B) radiation could be a challenge for wheat production systems in Southern Chile, as in other areas. Previous reports have shown that increased UV-B radiation decreases wheat yield by affecting both grain number and grain weight. However, contrasting results have also been published showing no effect on wheat biomass and grain yield. In addition, little is known about the effect of higher UV-B radiation at particular periods of the crop cycle on grain quality traits. The objective of the present study was to evaluate grain yield, yield components and grain quality in response to increased UV-B radiation during key periods of yield component determination. Two experiments were carried out under field conditions in the Universidad Austral de Chile (latitude 39°62′S). Two spring wheat cultivars were exposed to two periods of supplemented UV-B radiation (280–320 nm): (i) between booting and anthesis, c . 20 days, and (ii) from 10 days after anthesis until physiological maturity, c . 40 days. Ultraviolet radiation was increased to levels of 3·8 and 4·9 kJ/m 2 /day in experimental years 1 and 2, respectively, by using UV-B lamps. At harvest, plants were sampled to quantify aboveground biomass, grain yield, grain number and average grain weight. In addition, protein and gluten concentration of grains were measured. Grain yield was not affected ( P >0·05) by the UV-B increase at pre- or at post-anthesis treatments. Similar results were found for each yield component. In addition, grain protein and gluten concentration showed similar values in the increased UV-B and control treatments. Therefore, if increases in UV-B radiation take place during the latter stages of the crop cycle as is expected, the present results do not support the speculation that increases of UV-B radiation in Southern Chile will compromise wheat production systems.
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Claims 5
Claim · model-written summary
UV-B supplementation before or after anthesis did not significantly affect grain yield.
- Taxon
- wheat
Triticum aestivumt0 - Treatment
- UV-B increasee0
- Outcome
- Grain yielde0
- Direction
- not affectede0
- Qualifier
- pre- or at post-anthesis treatmentse0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Grain yield was not affected ( P >0·05) by the UV-B increase at pre- or at post-anthesis treatments”
t0“wheat”
Claim · model-written summary
UV-B supplementation produced similar yield component results.
- Taxon
- wheatTriticum aestivumt0
- Outcome
- yield componente0
- Direction
- Similar resultse0
Not reportedTreatmentComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Similar results were found for each yield component”
t0“wheat”
Claim · model-written summary
Grain protein concentration was similar under increased UV-B and control treatment.
- Taxon
- wheatTriticum aestivumt0
- Treatment
- increased UV-Be0
- Outcome
- grain proteine0
- Direction
- similar valuese0
- Comparator
- control treatmentse0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“grain protein and gluten concentration showed similar values in the increased UV-B and control treatments”
t0“wheat”
Claim · model-written summary
Grain gluten concentration was similar under increased UV-B and control treatment.
- Taxon
- wheatTriticum aestivumt0
- Treatment
- increased UV-Be0
- Outcome
- gluten concentratione0
- Direction
- similar valuese0
- Comparator
- control treatmentse0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“grain protein and gluten concentration showed similar values in the increased UV-B and control treatments”
t0“wheat”
Claim · model-written summary
The authors conclude late-cycle UV-B increases are unlikely to compromise wheat production in Southern Chile.
- Taxon
- wheatTriticum aestivume0
- Outcome
- do not support the speculation that increases of UV-B radiation in Southern Chile will compromise wheat production systemse0
- Setting
- Southern Chilee0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“the present results do not support the speculation that increases of UV-B radiation in Southern Chile will compromise wheat production systems”
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uv · yield · Triticum aestivum (wheat)Results differ
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See all 5 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.