Abstract
The effect of irradiance on changes in photosynthesis, free amino acids and polyamines was investigated. Two‐week‐old maize ( Zea mays L.) plants were chilled at 5°C in the light (250 μmol m −2 s −1 PAR) or dark. The chlorophyll fluorescence ratio, F v /F m , decreased in the light by ca 50% but did not change in the dark. Similarly to the F v /F m , there was no change in the transpiration rate or the stomatal conductance in the dark, while these parameters decreased by ca 55% in the light. The net photosynthesis rate declined in both cases, but to a far greater extent in the light (73%) than in the dark (40%). The intercellular CO 2 partial pressure increased by ca 50% in all cases. The free amino acid contents increased compared to the control during the cold treatment. In most cases this increase was more pronounced in the light than in the dark. There was a continuous increase in the putrescine level, which was more pronounced in the light than in the dark. The spermidine content increased one and a half times after one day in the light but decreased by 70% in the dark compared to the control values. From the second day a 50% decline in the spermidine content was observed in the light and an 80% decline in the dark. These results suggest that light has an influence not only on the photosynthetic processes during chilling stress but also on other stress markers such as polyamines and free amino acids.
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Claims 14
Claim · model-written summary
Chlorophyll fluorescence ratio fell about 50% under light chilling.
- Treatment
- lighte0
- Outcome
- chlorophyll fluorescence ratioe0
- Direction
- decreasede0
- Value
- ca 50%e0
- Comparator
- darke0
Zea maysOrganisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“The chlorophyll fluorescence ratio, F v /F m , decreased in the light by ca 50% but did not change in the dark.”
t0“Role of light in changes in free amino acid and polyamine contents at chilling temperature in maize (Zea mays)”
t1“photosynthesis, free amino acids and polyamines”
Claim · model-written summary
Chlorophyll fluorescence ratio did not change in darkness.
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“The chlorophyll fluorescence ratio, F v /F m , decreased in the light by ca 50% but did not change in the dark.”
t0“Role of light in changes in free amino acid and polyamine contents at chilling temperature in maize (Zea mays)”
t1“photosynthesis, free amino acids and polyamines”
Claim · model-written summary
Transpiration and stomatal conductance were unchanged in the dark.
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“there was no change in the transpiration rate or the stomatal conductance in the dark”
t0“Role of light in changes in free amino acid and polyamine contents at chilling temperature in maize (Zea mays)”
t1“photosynthesis, free amino acids and polyamines”
Claim · model-written summary
Transpiration and stomatal conductance decreased about 55% in light.
- Treatment
- lighte0
- Outcome
- transpiration rate or the stomatal conductancee1
- Direction
- decreasede0
- Value
- ca 55%e0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“these parameters decreased by ca 55% in the light.”
t0“Role of light in changes in free amino acid and polyamine contents at chilling temperature in maize (Zea mays)”
t1“photosynthesis, free amino acids and polyamines”
e1“there was no change in the transpiration rate or the stomatal conductance in the dark”
Claim · model-written summary
Net photosynthesis declined 73% in light.
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“The net photosynthesis rate declined in both cases, but to a far greater extent in the light (73%) than in the dark (40%).”
t0“Role of light in changes in free amino acid and polyamine contents at chilling temperature in maize (Zea mays)”
t1“photosynthesis, free amino acids and polyamines”
Claim · model-written summary
Net photosynthesis declined 40% in darkness.
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“The net photosynthesis rate declined in both cases, but to a far greater extent in the light (73%) than in the dark (40%).”
t0“Role of light in changes in free amino acid and polyamine contents at chilling temperature in maize (Zea mays)”
t1“photosynthesis, free amino acids and polyamines”
Claim · model-written summary
Intercellular CO2 partial pressure increased about 50% in both cases.
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“The intercellular CO 2 partial pressure increased by ca 50% in all cases.”
t0“Role of light in changes in free amino acid and polyamine contents at chilling temperature in maize (Zea mays)”
t1“photosynthesis, free amino acids and polyamines”
Claim · model-written summary
Free amino acids increased under cold relative to control.
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“The free amino acid contents increased compared to the control during the cold treatment.”
t0“Role of light in changes in free amino acid and polyamine contents at chilling temperature in maize (Zea mays)”
t1“photosynthesis, free amino acids and polyamines”
Claim · model-written summary
The amino acid increase was generally more pronounced in light.
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“In most cases this increase was more pronounced in the light than in the dark.”
t0“Role of light in changes in free amino acid and polyamine contents at chilling temperature in maize (Zea mays)”
t1“photosynthesis, free amino acids and polyamines”
e1“The free amino acid contents increased compared to the control during the cold treatment.”
Claim · model-written summary
Putrescine continuously increased, more in light than dark.
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“There was a continuous increase in the putrescine level, which was more pronounced in the light than in the dark.”
t0“Role of light in changes in free amino acid and polyamine contents at chilling temperature in maize (Zea mays)”
t1“photosynthesis, free amino acids and polyamines”
Claim · model-written summary
Spermidine increased one and a half times after one day in light.
- Treatment
- lighte0
- Outcome
- spermidine contente0
- Direction
- increasede0
- Value
- one and a half timese0
- Qualifier
- after one daye0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“The spermidine content increased one and a half times after one day in the light”
t0“Role of light in changes in free amino acid and polyamine contents at chilling temperature in maize (Zea mays)”
t1“photosynthesis, free amino acids and polyamines”
Claim · model-written summary
Spermidine decreased 70% in dark relative to control after one day.
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“decreased by 70% in the dark compared to the control values.”
t0“Role of light in changes in free amino acid and polyamine contents at chilling temperature in maize (Zea mays)”
t1“photosynthesis, free amino acids and polyamines”
e1“The spermidine content increased one and a half times after one day in the light”
Claim · model-written summary
From day two, spermidine declined 50% in light.
- Treatment
- lighte0
- Outcome
- spermidine contente0
- Direction
- declinee0
- Value
- 50%e0
- Qualifier
- From the second daye0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“From the second day a 50% decline in the spermidine content was observed in the light”
t0“Role of light in changes in free amino acid and polyamine contents at chilling temperature in maize (Zea mays)”
t1“photosynthesis, free amino acids and polyamines”
Claim · model-written summary
From day two, spermidine declined 80% in dark.
- Treatment
- darke0
- Outcome
- spermidine contente0
- Direction
- declinee0
- Value
- 80%e0
- Qualifier
- From the second daye0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“From the second day a 50% decline in the spermidine content was observed in the light and an 80% decline in the dark.”
t0“Role of light in changes in free amino acid and polyamine contents at chilling temperature in maize (Zea mays)”
t1“photosynthesis, free amino acids and polyamines”
The same questions in other papers
light · physiology: gas exchange · Zea mays (maize)Positive and negative results
2 papers in the same direction as this paper · 1 in the opposite direction
- positive
- no effect
- no effect
light · physiology: photosynthesis · Zea mays (maize)Positive and negative results
14 papers in the same direction as this paper · 13 in the opposite direction
- positive
- positive
- positive
24 papers more in this group
See all 28 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.