Abstract
We report the impact of present-day solar UV-B radiation on seedling emergence, its association with the accumulation of UV-absorbing compounds, and the growth and yield of radish (Raphanus sativus L.). Two field experiments were conducted at intermediate latitudes in South America (Buenos Aires, Argentina) using two cultivars of radish (`Scarlet Globe' and `Sparkler National'). Solar UV-B reduced the emergence of seedlings by nearly 20% for the Scarlet radish cultivar, and delayed emergence for both cultivars by least one day. Using a chlorophyll fluorescence method to estimate the degree of UV penetration into photosynthetic tissue, we found significant differences in the levels of UV-B-absorbing compounds between seedlings grown under contrasting levels of solar UV-B. The increase of specific UV-absorbing compounds in the cotyledons required an initial lag period of 4 d after the emergence of seedlings. We could not detect any relationship between the accumulation of UV-B-screening compounds in cotyledons and leaves of the same plant, suggesting that solar UV-B induced a localized response in green tissues. Ambient UV-B affected the biomass partitioned to tubers, resulting in an increase of at least 17% in tuber diameter and 26% in tuber fresh weight at the end of the life cycle. Our results indicate that the early effects of UV-B on seedling development involve a cost for young plants, but it appears to be advantageous to increase the carbon partitioning to the tubers at harvest. These findings suggest ways to improve the yield of radish crops.
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Claims 10
Claim · model-written summary
Solar UV-B reduced seedling emergence of the Scarlet radish cultivar by nearly 20%.
- Taxon
- Raphanus sativus
Raphanus sativust0 - Material
- Scarlet radish cultivare1
- Treatment
- Solar UV-Be1
- Outcome
- emergence of seedlingse1
- Direction
- reducede1
- Value
- nearly 20%e1
- Setting
- Buenos Aires, Argentinae0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
t0“radish ( Raphanus sativus )”
e0“Two field experiments were conducted at intermediate latitudes in South America (Buenos Aires, Argentina)”
e1“Solar UV-B reduced the emergence of seedlings by nearly 20% for the Scarlet radish cultivar”
Claim · model-written summary
Solar UV-B delayed seedling emergence of both radish cultivars by at least one day.
- Taxon
- Raphanus sativusRaphanus sativust0
- Treatment
- Solar UV-Be1
- Outcome
- emergencee2
- Direction
- delayede2
- Value
- by least one daye2
- Setting
- Buenos Aires, Argentinae0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
t0“radish ( Raphanus sativus )”
e0“Two field experiments were conducted at intermediate latitudes in South America (Buenos Aires, Argentina)”
e1“Solar UV-B reduced the emergence of seedlings by nearly 20% for the Scarlet radish cultivar”
e2“delayed emergence for both cultivars by least one day”
Claim · model-written summary
Seedlings grown under contrasting solar UV-B levels differed significantly in UV-B-absorbing compounds.
- Taxon
- Raphanus sativusRaphanus sativust0
- Treatment
- contrasting levels of solar UV-Be3
- Outcome
- levels of UV-B-absorbing compoundse3
Not reportedComparatorDirection
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
t0“radish ( Raphanus sativus )”
e3“we found significant differences in the levels of UV-B-absorbing compounds between seedlings grown under contrasting levels of solar UV-B”
Claim · model-written summary
Increase of specific UV-absorbing compounds in cotyledons required an initial lag period of 4 d after seedling emergence.
- Taxon
- Raphanus sativusRaphanus sativust0
- Organ / stage
- cotyledonse4
- Outcome
- increase of specific UV-absorbing compoundse4
- Value
- 4 de4
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
t0“radish ( Raphanus sativus )”
e4“The increase of specific UV-absorbing compounds in the cotyledons required an initial lag period of 4 d after the emergence of seedlings”
Claim · model-written summary
UV-B-screening compound accumulation in cotyledons was not related to that in leaves of the same plant.
- Taxon
- Raphanus sativusRaphanus sativust0
- Organ / stage
- cotyledons and leavese5
- Outcome
- accumulation of UV-B-screening compoundse5
Not reportedDirection
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
t0“radish ( Raphanus sativus )”
e5“We could not detect any relationship between the accumulation of UV-B-screening compounds in cotyledons and leaves of the same plant”
Claim · model-written summary
Solar UV-B induced a localized UV-screening response in green tissues.
- Taxon
- Raphanus sativusRaphanus sativust0
- Organ / stage
- green tissuese6
- Treatment
- solar UV-Be6
- Outcome
- localized responsee6
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
t0“radish ( Raphanus sativus )”
e6“suggesting that solar UV-B induced a localized response in green tissues”
Claim · model-written summary
Ambient UV-B increased tuber diameter by at least 17%.
- Taxon
- Raphanus sativusRaphanus sativust0
- Organ / stage
- tuberse7
- Treatment
- Ambient UV-Be7
- Outcome
- tuber diametere7
- Direction
- increasee7
- Value
- at least 17%e7
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
t0“radish ( Raphanus sativus )”
e7“Ambient UV-B affected the biomass partitioned to tubers, resulting in an increase of at least 17% in tuber diameter and 26% in tuber fresh weight at the end of the life cycle”
Claim · model-written summary
Ambient UV-B increased tuber fresh weight by 26%.
- Taxon
- Raphanus sativusRaphanus sativust0
- Organ / stage
- tuberse7
- Treatment
- Ambient UV-Be7
- Outcome
- tuber fresh weighte7
- Direction
- increasee7
- Value
- 26%e7
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
t0“radish ( Raphanus sativus )”
e7“Ambient UV-B affected the biomass partitioned to tubers, resulting in an increase of at least 17% in tuber diameter and 26% in tuber fresh weight at the end of the life cycle”
Claim · model-written summary
Early effects of UV-B on seedling development carry a cost for young radish plants.
- Taxon
- Raphanus sativusRaphanus sativust0
- Treatment
- UV-Be1
- Outcome
- early effects of UV-B on seedling developmente1
- Qualifier
- involve a cost for young plantse1
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
t0“radish ( Raphanus sativus )”
e1“Our results indicate that the early effects of UV-B on seedling development involve a cost for young plants”
Claim · model-written summary
Increasing carbon partitioning to radish tubers at harvest appears advantageous and could improve radish yield.
- Taxon
- Raphanus sativusRaphanus sativust0
- Outcome
- carbon partitioning to the tubers at harveste1
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
t0“radish ( Raphanus sativus )”
e1“it appears to be advantageous to increase the carbon partitioning to the tubers at harvest”
e2“These findings suggest ways to improve the yield of radish crops”
The same questions in other papers
uv · growth · Raphanus sativus (radish)Positive and negative results
2 papers in the same direction as this paper · 2 in the opposite direction
- no effect
- negative
- positive
1 paper more in this group
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.