Abstract
A field experiment was conducted using three corn cultivars (Jingyu7, Nongda80, and Tangyu10) and three nitrogen (N) application rates (0, 75, and 150 kg N ha(-1)). The objectives of this study were to investigate the responses of photosynthetic CO2 assimilation (Ph), the maximum quantum yield of photosystem II (Fv/Fm), leaf dry weight (LDW), leaf nitrogen concentration (LNC), leaf sugar concentration (LSC), and the sugar-to-nitrogen concentration ratio (S/N) to N levels in three different field-grown corn cultivars on three sampling dates. The results showed that the LDW, Fv/Fm, Ph, LNC, and LSC increased with increasing N levels, and the variation patterns of Fv/Fm, Ph, and LNC were "low-high-low". In contrast, S/N decreased with increasing N levels, and its variation pattern was "high-low-high". The values of LDW, Fv/Fm, Ph, LNC, LSC, and S/N were greatest under high N conditions, followed by medium N conditions, and finally low N conditions. Significant interactions occurred between Ph, Fv/Fm, LNC, LSC, LDW, and S/N, with the exception of the interaction between LSC and S/N and between LSC and LDW. The correlation coefficients between Ph and S/N and between Fv/Fm and S/N were -0.714 and -0.798, respectively.
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Claims 8
Claim · model-written summary
Leaf dry weight increased with nitrogen level.
- Taxon
- corn
Zea mays subsp. mayst0 - Treatment
- increasing N levelse0
- Outcome
- LDWe0
- Direction
- increasede0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“The results showed that the LDW, Fv/Fm, Ph, LNC, and LSC increased with increasing N levels”
t0“corn”
Claim · model-written summary
Fv/Fm, photosynthetic CO2 assimilation and leaf nitrogen concentration increased with nitrogen level and followed low-high-low variation.
- Taxon
- cornZea mays subsp. mayst0
- Treatment
- increasing N levelse0
- Outcome
- Fv/Fm, Ph, and LNCe0
- Direction
- increasede0
- Qualifier
- "low-high-low"e0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“The results showed that the LDW, Fv/Fm, Ph, LNC, and LSC increased with increasing N levels, and the variation patterns of Fv/Fm, Ph, and LNC were "low-high-low".”
t0“corn”
Claim · model-written summary
Leaf sugar concentration increased with nitrogen level.
- Taxon
- cornZea mays subsp. mayst0
- Treatment
- increasing N levelse0
- Outcome
- LSCe0
- Direction
- increasede0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“The results showed that the LDW, Fv/Fm, Ph, LNC, and LSC increased with increasing N levels”
t0“corn”
Claim · model-written summary
Sugar-to-nitrogen ratio decreased with increasing nitrogen and followed high-low-high variation.
- Taxon
- cornZea mays subsp. mayst0
- Treatment
- increasing N levelse0
- Outcome
- S/Ne0
- Direction
- decreasede0
- Qualifier
- "high-low-high"e0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“S/N decreased with increasing N levels, and its variation pattern was "high-low-high".”
t0“corn”
Claim · model-written summary
Reported leaf traits had greatest values under high nitrogen, then medium, then low nitrogen.
- Taxon
- cornZea mays subsp. mayst0
- Treatment
- high N conditionse0
- Outcome
- LDW, Fv/Fm, Ph, LNC, LSC, and S/Ne0
- Direction
- greateste0
- Comparator
- medium N conditionse0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“The values of LDW, Fv/Fm, Ph, LNC, LSC, and S/N were greatest under high N conditions, followed by medium N conditions, and finally low N conditions.”
t0“corn”
Claim · model-written summary
Most pairs among the measured physiological traits had significant interactions, except LSC with S/N and LDW.
- Taxon
- cornZea mays subsp. mayst0
- Organ / stage
- LDWe0
- Outcome
- interactionse0
Not reportedDirection
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Significant interactions occurred between Ph, Fv/Fm, LNC, LSC, LDW, and S/N, with the exception of the interaction between LSC and S/N and between LSC and LDW.”
t0“corn”
Claim · model-written summary
Photosynthetic assimilation and sugar-to-nitrogen ratio were negatively correlated at -0.714.
- Taxon
- cornZea mays subsp. mayst0
- Organ / stage
- Phe0
- Outcome
- Ph and S/Ne0
- Direction
- decreaseinferrede0
- Value
- -0.714e0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“The correlation coefficients between Ph and S/N and between Fv/Fm and S/N were -0.714 and -0.798, respectively.”
t0“corn”
Claim · model-written summary
Fv/Fm and sugar-to-nitrogen ratio were negatively correlated at -0.798.
- Taxon
- cornZea mays subsp. mayst0
- Organ / stage
- Fv/Fme0
- Outcome
- Fv/Fm and S/Ne0
- Direction
- decreaseinferrede0
- Value
- -0.798e0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“The correlation coefficients between Ph and S/N and between Fv/Fm and S/N were -0.714 and -0.798, respectively.”
t0“corn”
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