Abstract
Young seedlings of Zea mays L. scarcely grow at temperatures of 15 °C or lower. The leaves are yellowish, the chlorophyll concentration being lower than 10 μg (a+b) per cm2, and the rate of photosynthesis is negligible. When a period of low temperature is given to older plants, which already have some green leaf surface, the reduction in relative growth rate and photosynthesis is less severe. Only those leaf parts that elongate during the cold treatment are yellow. It can be shown that the day temperature is the important factor in influencing the chlorophyll concentration in growing leaf parts. Plants subjected to low night temperatures remain fully green and their growth rate is virtually unaffected. The data suggest that photosynthesis rate is reduced at concentrations of chlorophyll (a+b) below 40μg per cm-2. When plants are brought back to temperatures of 20 ° or higher both photosynthesis rate and growth rate soon reach values normal for this temperature.
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Claims 13
Claim · model-written summary
Young maize seedlings scarcely grew at 15 °C or lower.
- Organ / stage
- Young seedlingse0
- Treatment
- temperatures of 15 °C or lowere0
- Outcome
- growe0
- Direction
- scarcelye0
Zea maysNot reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Young seedlings of Zea mays L. scarcely grow at temperatures of 15 °C or lower”
Claim · model-written summary
Young maize leaves were yellowish under low temperature.
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Zea mays L.”
e1“The leaves are yellowish”
Claim · model-written summary
Young maize seedling leaf chlorophyll concentration was below 10 μg (a+b) per cm2.
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Zea mays L.”
e1“chlorophyll concentration being lower than 10 μg (a+b) per cm2”
Claim · model-written summary
Young maize seedling photosynthesis was negligible under low temperature.
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Zea mays L.”
e1“the rate of photosynthesis is negligible”
Claim · model-written summary
Older plants with green leaf surface had a less severe reduction in relative growth rate under cold.
- Treatment
- a period of low temperaturee1
- Outcome
- relative growth ratee1
- Direction
- less severee1
- Comparator
- Young seedlingse2
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Zea mays L.”
e1“When a period of low temperature is given to older plants, which already have some green leaf surface, the reduction in relative growth rate and photosynthesis is less severe”
e2“Young seedlings”
Claim · model-written summary
Older plants with green leaf surface had a less severe reduction in photosynthesis under cold than young seedlings.
- Treatment
- a period of low temperaturee1
- Outcome
- photosynthesise1
- Direction
- less severee1
- Comparator
- Young seedlingse2
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Zea mays L.”
e1“When a period of low temperature is given to older plants, which already have some green leaf surface, the reduction in relative growth rate and photosynthesis is less severe”
e2“Young seedlings”
Claim · model-written summary
Only leaf parts elongating during cold treatment became yellow.
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Zea mays L.”
e1“Only those leaf parts that elongate during the cold treatment are yellow”
Claim · model-written summary
Day temperature influenced chlorophyll concentration in growing maize leaf parts.
Not reportedDirection
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Zea mays L.”
e1“the day temperature is the important factor in influencing the chlorophyll concentration in growing leaf parts”
Claim · model-written summary
Low night temperatures left maize plants fully green.
Not reportedComparatorDirection
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Zea mays L.”
e1“Plants subjected to low night temperatures remain fully green”
Claim · model-written summary
Low night temperatures virtually did not affect maize growth rate.
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Zea mays L.”
e1“their growth rate is virtually unaffected”
e2“low night temperatures”
Claim · model-written summary
Photosynthesis rate was suggested to decline when chlorophyll (a+b) concentration fell below 40μg per cm-2.
- Compound
- chlorophyll (a+b)e1
- Outcome
- photosynthesis ratee1
- Direction
- reducede1
- Qualifier
- below 40μg per cm-2e1
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Zea mays L.”
e1“photosynthesis rate is reduced at concentrations of chlorophyll (a+b) below 40μg per cm-2”
Claim · model-written summary
After return to 20 ° or higher, maize photosynthesis rate soon reached normal values.
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Zea mays L.”
e1“When plants are brought back to temperatures of 20 ° or higher both photosynthesis rate and growth rate soon reach values normal for this temperature”
Claim · model-written summary
After return to 20 ° or higher, maize growth rate soon reached normal values.
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Zea mays L.”
e1“When plants are brought back to temperatures of 20 ° or higher both photosynthesis rate and growth rate soon reach values normal for this temperature”
The same questions in other papers
cold · physiology: photosynthesis · Zea mays (maize)Results differ
4 papers in the same direction as this paper · 31 in the opposite direction
- negative
- negative
- negative
32 papers more in this group
See all 36 papers →cold · growth · Zea mays (maize)Results differ
15 papers in the same direction as this paper · 56 in the opposite direction · 1 reporting no difference from an alternative
- no effect
- no effect
- negative
69 papers more in this group
See all 73 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.