Abstract
Regional increases in atmospheric O3 are phytotoxic not only to major crops but also to root vegetables such as radish, and their effects can be further modulated by nitrogen (N) addition. To assess how cherry radish responds to elevated O3 (eO3) under N addition and to compare the dose–response relationships, we established six open-top chambers with two O3 levels and two N treatments in Beijing, China, to examine gas exchange, growth, and biomass throughout the growing period. The results showed that: 1. eO3 had a “priming effect” on photosynthesis rates (Pn) at the beginning of the experiment. N addition alleviated the O3-induced Pn reduction at the end of the experiment by 6.76% but did not significantly influence the O3-dose response to Pn; 2. stomatal conductance (gs) did not have a dose response to all treatments while evaporation rates (E) showed strong negative regression with AOT40; 3. N addition reduced the hypocotyl biomass (−47.70%), leaf biomass (−32.22%), and the whole plant biomass reduction caused by O3 (−38.47%) at the end of the experiment, but N addition did not significantly influence O3-dose response to biomass. In conclusion, N addition can alleviate O3-induced reductions in Pn and biomass via non-stomatal mechanisms, but it is ineffective in altering long-term O3 dose–response relationships. Soil N addition offers a short-term strategy to mitigate O3 impacts on short-lived root vegetables such as cherry radish but does not influence key functional traits over the long term. This study highlights the potential of N addition to alleviate acute oxidative stress, while underscoring its limitations in mitigating the effects of prolonged O3 exposure in root vegetables.
Abstract from the paper’s OpenAlex record; open copy licensed cc-by. Read at the source ↗
The text the model read, with the source record’s inline markup (italics, sub- and superscripts) rendered and its character entities decoded; quote offsets refer to the raw text.
Claims 11
Claim · model-written summary
Elevated ozone initially primed photosynthesis.
- Taxon
- Raphanus sativus L.
Raphanus sativust0 - Treatment
- eO3e0
- Outcome
- photosynthesis rates (Pn)e0
- Direction
- priming effecte0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“eO3 had a “priming effect” on photosynthesis rates (Pn) at the beginning of the experiment”
t0“Raphanus sativus L.”
t1“Raphanus sativus L.”
Claim · model-written summary
Nitrogen addition alleviated late ozone-related photosynthesis reduction by 6.76%.
- Taxon
- Raphanus sativus L.Raphanus sativust0
- Treatment
- N additione0
- Outcome
- Pn reductione0
- Direction
- alleviatede0
- Value
- 6.76%e0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“N addition alleviated the O3-induced Pn reduction at the end of the experiment by 6.76%”
t0“Raphanus sativus L.”
t1“Raphanus sativus L.”
Claim · model-written summary
Nitrogen did not significantly influence the ozone dose response of photosynthesis.
- Taxon
- Raphanus sativus L.Raphanus sativust0
- Treatment
- N additione1
- Outcome
- O3-dose response to Pne0
- Direction
- did not significantly influencee0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“did not significantly influence the O3-dose response to Pn”
t0“Raphanus sativus L.”
t1“Raphanus sativus L.”
e1“N addition alleviated the O3-induced Pn reduction at the end of the experiment by 6.76%”
Claim · model-written summary
Stomatal conductance lacked a dose response across treatments.
- Taxon
- Raphanus sativus L.Raphanus sativust0
- Outcome
- stomatal conductance (gs)e0
- Direction
- did not have a dose responsee0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“stomatal conductance (gs) did not have a dose response to all treatments”
t0“Raphanus sativus L.”
t1“Raphanus sativus L.”
Claim · model-written summary
Evaporation rate was negatively related to AOT40.
- Taxon
- Raphanus sativus L.Raphanus sativust0
- Treatment
- AOT40e0
- Outcome
- evaporation rates (E)e0
- Direction
- negativee0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“evaporation rates (E) showed strong negative regression with AOT40”
t0“Raphanus sativus L.”
t1“Raphanus sativus L.”
Claim · model-written summary
Nitrogen addition reduced ozone-related hypocotyl biomass reduction by 47.70%.
- Taxon
- Raphanus sativus L.Raphanus sativust0
- Treatment
- N additione0
- Outcome
- hypocotyl biomasse0
- Direction
- reducede0
- Value
- −47.70%e0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“N addition reduced the hypocotyl biomass (−47.70%), leaf biomass (−32.22%), and the whole plant biomass reduction caused by O3 (−38.47%)”
t0“Raphanus sativus L.”
t1“Raphanus sativus L.”
Claim · model-written summary
Nitrogen addition reduced ozone-related leaf biomass reduction by 32.22%.
- Taxon
- Raphanus sativus L.Raphanus sativust0
- Treatment
- N additione0
- Outcome
- leaf biomasse0
- Direction
- reducede0
- Value
- −32.22%e0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“N addition reduced the hypocotyl biomass (−47.70%), leaf biomass (−32.22%), and the whole plant biomass reduction caused by O3 (−38.47%)”
t0“Raphanus sativus L.”
t1“Raphanus sativus L.”
Claim · model-written summary
Nitrogen addition reduced ozone-related whole-plant biomass reduction by 38.47%.
- Taxon
- Raphanus sativus L.Raphanus sativust0
- Treatment
- N additione0
- Outcome
- whole plant biomass reductione0
- Direction
- reducede0
- Value
- −38.47%e0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“N addition reduced the hypocotyl biomass (−47.70%), leaf biomass (−32.22%), and the whole plant biomass reduction caused by O3 (−38.47%)”
t0“Raphanus sativus L.”
t1“Raphanus sativus L.”
Claim · model-written summary
Nitrogen did not significantly change the ozone dose response of biomass.
- Taxon
- Raphanus sativus L.Raphanus sativust0
- Treatment
- N additione0
- Outcome
- O3-dose response to biomasse0
- Direction
- did not significantly influencee0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“N addition did not significantly influence O3-dose response to biomass”
t0“Raphanus sativus L.”
t1“Raphanus sativus L.”
Claim · model-written summary
The authors propose a non-stomatal mechanism for nitrogen mitigation of ozone effects.
- Taxon
- Raphanus sativus L.Raphanus sativust0
- Treatment
- N additione0
- Outcome
- O3-induced reductions in Pn and biomasse0
- Qualifier
- non-stomatal mechanismse0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“N addition can alleviate O3-induced reductions in Pn and biomass via non-stomatal mechanisms”
t0“Raphanus sativus L.”
t1“Raphanus sativus L.”
Claim · model-written summary
Soil nitrogen addition is proposed as a short-term strategy to mitigate ozone impacts.
Verbatim
e0“Soil N addition offers a short-term strategy to mitigate O3 impacts on short-lived root vegetables such as cherry radish”
t0“Raphanus sativus L.”
t1“Raphanus sativus L.”
The same questions in other papers
nitrogen · physiology: photosynthesis · Raphanus sativus (radish)Positive and negative results
1 paper in the same direction as this paper · 1 in the opposite direction
- negative
- positive
nitrogen · growth · Raphanus sativus (radish)Positive and negative results
14 papers in the same direction as this paper · 6 in the opposite direction · 1 reporting no difference from an alternative
- no effect
- no effect
- negative
18 papers more in this group
See all 22 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.