Abstract
The effect of heat stress (47.5°C for 2 min given to the roots) on photosynthetic activity and chloroplast ultrastructure was studied in correlation with the endogenous cytokinin concentration in maize (Zea mays L. “Fronica”) seedlings. Shoot and root growth were visibly inhibited by the heat treatment. In etiolated leaf segments there was a clear-cut inhibition of photosynthetic activity, chlorophyll accumulation and chloroplast development. This inhibition was reversible by benzyladenine. In green tissue heat stress only affected photosynthetic activity and chlorophyll accumulation. Again this inhibition could be reversed by benzyladenine. In the primary leaves of green seedlings heat stress lowered cytokinin concentration severely; in etiolated leaves no effect of heat stress could be observed, since the cytokinin concentration was below the detectable level. Our results provide an indication for a correlation between hormonal control and chloroplast biogenesis.
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Claims 8
Claim · model-written summary
Root heat stress visibly inhibited shoot and root growth.
- Material
- Fronicae2
- Treatment
- heat stress (47.5°C for 2 min given to the roots)e1
- Outcome
- Shoot and root growthe0
- Direction
- inhibitede0
Zea maysNot reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Shoot and root growth were visibly inhibited by the heat treatment.”
e1“heat stress (47.5°C for 2 min given to the roots)”
e2“maize (Zea mays L. “Fronica”) seedlings”
Claim · model-written summary
In etiolated leaves, heat stress inhibited photosynthetic activity, chlorophyll accumulation and chloroplast development.
- Organ / stage
- etiolated leaf segmentse0
- Treatment
- heat stresse1
- Outcome
- photosynthetic activity, chlorophyll accumulation and chloroplast developmente0
- Direction
- inhibitione0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“In etiolated leaf segments there was a clear-cut inhibition of photosynthetic activity, chlorophyll accumulation and chloroplast development.”
e1“heat stress (47.5°C for 2 min given to the roots)”
e2“maize (Zea mays L. “Fronica”) seedlings”
Claim · model-written summary
Benzyladenine reversed heat inhibition in etiolated leaves.
- Organ / stage
- etiolated leaf segmentse1
- Treatment
- benzyladeninee0
- Outcome
- inhibitione0
- Direction
- reversiblee0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“This inhibition was reversible by benzyladenine.”
e1“In etiolated leaf segments there was a clear-cut inhibition of photosynthetic activity, chlorophyll accumulation and chloroplast development.”
e2“maize (Zea mays L. “Fronica”) seedlings”
Claim · model-written summary
In green tissue, heat stress inhibited photosynthetic activity and chlorophyll accumulation.
- Organ / stage
- green tissuee0
- Treatment
- heat stresse0
- Outcome
- photosynthetic activity and chlorophyll accumulatione0
- Direction
- inhibitione1
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“In green tissue heat stress only affected photosynthetic activity and chlorophyll accumulation.”
e1“Again this inhibition could be reversed by benzyladenine.”
e2“maize (Zea mays L. “Fronica”) seedlings”
Claim · model-written summary
Benzyladenine reversed heat inhibition in green tissue.
- Organ / stage
- green tissuee1
- Treatment
- benzyladeninee0
- Outcome
- photosynthetic activity and chlorophyll accumulatione1
- Direction
- reversede0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Again this inhibition could be reversed by benzyladenine.”
e1“In green tissue heat stress only affected photosynthetic activity and chlorophyll accumulation.”
e2“maize (Zea mays L. “Fronica”) seedlings”
Claim · model-written summary
Heat stress severely lowered cytokinin concentration in primary leaves of green seedlings.
- Organ / stage
- primary leaves of green seedlingse0
- Treatment
- heat stresse0
- Outcome
- cytokinin concentratione0
- Direction
- lowerede0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“In the primary leaves of green seedlings heat stress lowered cytokinin concentration severely”
e1“maize (Zea mays L. “Fronica”) seedlings”
Claim · model-written summary
Cytokinin was below detection in etiolated leaves, preventing assessment of a heat effect.
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“in etiolated leaves no effect of heat stress could be observed, since the cytokinin concentration was below the detectable level.”
e1“maize (Zea mays L. “Fronica”) seedlings”
Claim · model-written summary
The findings indicate a correlation between hormonal control and chloroplast biogenesis.
Not reportedGeneCompoundOrgan / stageTreatmentComparatorSettingDirection
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Our results provide an indication for a correlation between hormonal control and chloroplast biogenesis.”
e1“maize (Zea mays L. “Fronica”) seedlings”
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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.