Abstract
High-temperature stress severely reduces the photosynthetic efficiency of radish (Raphanus sativus L.), a cool-season crop. This study evaluated five nitrogen (N) levels {0 N, 0.5 N, 1 N (234 kg urea ha−1, based on RDA), 2 N, and 4 N} through an open-field experiment under high-temperature stress conditions. Analysis of OJIP transients revealed that high temperatures severely inhibited photosynthetic capacity in the 0 N, 0.5 N, and 4 N treatment groups. These groups exhibited a simultaneous increase in K and J-steps, signifying electron transport bottlenecks and structural damage to the oxygen-evolving complex (OEC). Consequently, energy absorption and trapping decreased, while heat dissipation increased. In contrast, the 2 N treatment maintained superior Fm(maximum fluorescence) and energy flux, demonstrating enhanced photosynthetic resilience. However, despite improved photosynthetic stability, the 2 N group did not show a significant increase in yield compared to the 0.5 N or 1 N treatment groups. These results suggest that photosynthetic protection under heat stress does not necessarily guarantee higher yields, highlighting the need to identify optimal fertilization points for sustainable production. Overall, the findings of this study provide fundamental data for strategic nitrogen management in open-field radish cultivation to mitigate the impacts of increasing climatic instability.
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Claims 7
Claim · model-written summary
High temperatures severely inhibited photosynthetic capacity in the 0 N, 0.5 N and 4 N groups.
- Taxon
- Autumn Radish
Raphanus sativust0 - Treatment
- high temperaturese1
- Outcome
- photosynthetic capacitye1
- Direction
- severely inhibitede1
- Qualifier
- 0 N, 0.5 N, and 4 N treatment groupse1
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
t0“Autumn Radish”
e1“high temperatures severely inhibited photosynthetic capacity in the 0 N, 0.5 N, and 4 N treatment groups”
Claim · model-written summary
In the 0 N, 0.5 N and 4 N groups the K and J-steps increased under heat.
- Taxon
- Autumn RadishRaphanus sativust0
- Outcome
- K and J-stepse2
- Direction
- increasee2
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
t0“Autumn Radish”
e2“These groups exhibited a simultaneous increase in K and J-steps, signifying electron transport bottlenecks and structural damage to the oxygen-evolving complex (OEC)”
Claim · model-written summary
Energy absorption and trapping decreased under heat in the same groups.
- Taxon
- Autumn RadishRaphanus sativust0
- Outcome
- energy absorption and trappinge3
- Direction
- decreasede3
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
t0“Autumn Radish”
e3“Consequently, energy absorption and trapping decreased, while heat dissipation increased”
Claim · model-written summary
Heat dissipation increased under heat in the same groups.
- Taxon
- Autumn RadishRaphanus sativust0
- Outcome
- heat dissipatione3
- Direction
- increasede3
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
t0“Autumn Radish”
e3“Consequently, energy absorption and trapping decreased, while heat dissipation increased”
Claim · model-written summary
The 2 N treatment maintained superior Fm and energy flux under heat stress.
- Taxon
- Autumn RadishRaphanus sativust0
- Treatment
- 2 Ne4
- Outcome
- Fm(maximum fluorescence) and energy fluxe4
- Direction
- maintained superiore4
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
t0“Autumn Radish”
e4“the 2 N treatment maintained superior Fm(maximum fluorescence) and energy flux, demonstrating enhanced photosynthetic resilience”
Claim · model-written summary
The 2 N group did not show a significant yield increase compared with the 0.5 N or 1 N groups.
- Taxon
- Autumn RadishRaphanus sativust0
- Treatment
- 2 Ne5
- Outcome
- yielde5
- Direction
- did not show a significant increasee5
- Comparator
- 0.5 N or 1 N treatment groupse5
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
t0“Autumn Radish”
e5“the 2 N group did not show a significant increase in yield compared to the 0.5 N or 1 N treatment groups”
Claim · model-written summary
Photosynthetic protection under heat stress does not necessarily guarantee higher yields.
- Taxon
- Autumn RadishRaphanus sativust0
- Treatment
- photosynthetic protection under heat stresse6
- Outcome
- yieldse6
- Direction
- does not necessarily guarantee highere6
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
t0“Autumn Radish”
e6“photosynthetic protection under heat stress does not necessarily guarantee higher yields”
The same questions in other papers
heat · physiology: photosynthesis · Raphanus sativus (radish)Results agree
1 paper in the same direction as this paper
- negative
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.