Abstract
Abstract Exposure to elevated tropospheric ozone concentration ([O 3 ]) accelerates leaf senescence in many C 3 crops. However, the effects of elevated [O 3 ] on C 4 crops including maize ( Zea mays L.) are poorly understood in terms of physiological mechanism and genetic variation in sensitivity. Using free air gas concentration enrichment, we investigated the photosynthetic response of 18 diverse maize inbred and hybrid lines to season‐long exposure to elevated [O 3 ] (~100 nl L −1 ) in the field. Gas exchange was measured on the leaf subtending the ear throughout the grain filling period. On average over the lifetime of the leaf, elevated [O 3 ] led to reductions in photosynthetic CO 2 assimilation of both inbred (−22%) and hybrid (−33%) genotypes. There was significant variation among both inbred and hybrid lines in the sensitivity of photosynthesis to elevated [O 3 ], with some lines showing no change in photosynthesis at elevated [O 3 ]. Based on analysis of inbred line B73, the reduced CO 2 assimilation at elevated [O 3 ] was associated with accelerated senescence decreasing photosynthetic capacity and not altered stomatal limitation. These findings across diverse maize genotypes could advance the development of more O 3 tolerant maize and provide experimental data for parameterization and validation of studies modeling how O 3 impacts crop performance.
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Claims 8
Claim · model-written summary
Elevated ozone reduced lifetime photosynthetic CO2 assimilation in maize inbreds by 22%.
- Material
- inbrede0
- Treatment
- elevated [O 3 ]e0
- Outcome
- photosynthetic CO 2 assimilatione0
- Direction
- reductionse0
- Value
- −22%e0
Zea maysNot reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e7“maize ( Zea mays L.)”
e0“elevated [O 3 ] led to reductions in photosynthetic CO 2 assimilation of both inbred (−22%) and hybrid (−33%) genotypes”
Claim · model-written summary
Elevated ozone reduced lifetime photosynthetic CO2 assimilation in maize hybrids by 33%.
- Material
- hybride0
- Treatment
- elevated [O 3 ]e0
- Outcome
- photosynthetic CO 2 assimilatione0
- Direction
- reductionse0
- Value
- −33%e0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e7“maize ( Zea mays L.)”
e0“elevated [O 3 ] led to reductions in photosynthetic CO 2 assimilation of both inbred (−22%) and hybrid (−33%) genotypes”
Claim · model-written summary
Inbred lines varied significantly in photosynthetic sensitivity to elevated ozone.
Not reportedDirection
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e7“maize ( Zea mays L.)”
e0“There was significant variation among both inbred and hybrid lines in the sensitivity of photosynthesis to elevated [O 3 ]”
Claim · model-written summary
Hybrid lines varied significantly in photosynthetic sensitivity to elevated ozone.
Not reportedDirection
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e7“maize ( Zea mays L.)”
e0“There was significant variation among both inbred and hybrid lines in the sensitivity of photosynthesis to elevated [O 3 ]”
Claim · model-written summary
Some maize lines had no photosynthetic change at elevated ozone.
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e7“maize ( Zea mays L.)”
e0“some lines showing no change in photosynthesis at elevated [O 3 ]”
Claim · model-written summary
In B73, reduced CO2 assimilation at elevated ozone was associated with accelerated senescence.
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e7“maize ( Zea mays L.)”
e0“Based on analysis of inbred line B73, the reduced CO 2 assimilation at elevated [O 3 ] was associated with accelerated senescence”
Claim · model-written summary
Accelerated senescence was associated with decreased photosynthetic capacity in B73.
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e7“maize ( Zea mays L.)”
e0“accelerated senescence decreasing photosynthetic capacity”
Claim · model-written summary
Altered stomatal limitation was not associated with reduced CO2 assimilation in B73.
Not reportedDirection
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e7“maize ( Zea mays L.)”
e0“the reduced CO 2 assimilation at elevated [O 3 ] was associated with accelerated senescence decreasing photosynthetic capacity and not altered stomatal limitation”
e1“Based on analysis of inbred line B73”
The same questions in other papers
ozone · physiology: photosynthesis · Zea mays (maize)Positive and negative results
8 papers in the same direction as this paper · 2 in the opposite direction
- positive
- negative
- no effect
7 papers more in this group
See all 11 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.