Abstract
Within an experiment conducted in open top chambers in which two mais genotypes differing in stay-green trait were cultivated under elevated atmospheric CO2 concentration (EC) in comparison with ambient CO2 concentration (AC), and in two contrast levels of nitrogen nutrition, the effect of acclimation to these factors on photosynthetic performance and water use efficiency, and subsequent response to short-term high temperature and drought stress was studied. Although EC improved water use efficiency, this effect did not alleviate the response to drought stress, and under some combinations of factors even led to a decrease in CO2 assimilation rate under drought stress. Differences in the stay- green trait between genotypes did not have a major effect on the response to high temperature and drought stress. Differences between genotypes were manifested mainly in the interaction with nitrogen nutrition, while in the Korynt genotype, non fertilised variants showed a lower response of CO2 assimilation rate to drought. Slight alleviating effect of higher nitrogen dose was found under EC conditions, while no nitrogen fertilisation rather increased drought resilience under AC conditions.
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Claims 7
Claim · model-written summary
Elevated CO2 improved water use efficiency.
Zea maysNot reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
t0“mais”
e0“Although EC improved water use efficiency”
Claim · model-written summary
Elevated CO2 did not alleviate drought response.
Not reportedTreatmentComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
t0“mais”
e0“this effect did not alleviate the response to drought stress”
Claim · model-written summary
Under some factor combinations elevated CO2 decreased CO2 assimilation during drought.
Not reportedTreatmentComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
t0“mais”
e0“under some combinations of factors even led to a decrease in CO2 assimilation rate under drought stress”
Claim · model-written summary
Stay-green differences had little effect on heat and drought response.
- Material
- genotypese0
- Outcome
- response to high temperature and drought stresse0
- Direction
- did not have a major effecte0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
t0“mais”
e0“Differences in the stay- green trait between genotypes did not have a major effect on the response to high temperature and drought stress”
Claim · model-written summary
In Korynt, unfertilized plants had lower drought response of CO2 assimilation.
- Material
- Korynte0
- Treatment
- non fertilised variantse0
- Outcome
- response of CO2 assimilation rate to droughte0
- Direction
- lowere0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
t0“mais”
e0“in the Korynt genotype, non fertilised variants showed a lower response of CO2 assimilation rate to drought”
Claim · model-written summary
Higher nitrogen slightly alleviated response under elevated CO2.
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
t0“mais”
e0“Slight alleviating effect of higher nitrogen dose was found under EC conditions”
Claim · model-written summary
No nitrogen fertilization increased drought resilience under ambient CO2.
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
t0“mais”
e0“no nitrogen fertilisation rather increased drought resilience under AC conditions”
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