Abstract
Maize (Zea mays) was grown in indoor chambers with ambient (38 Pa) and elevated (70 Pa) CO(2) . Drought treatments were imposed 17 days after sowing by withholding nutrient solution. Decreases of soil water content, leaf water potential, net CO(2) assimilation and stomatal conductance as a result of drought were delayed approximately 2 days by CO(2) enrichment. Concentrations of 28 of 33 leaf metabolites were altered by drought. Soluble carbohydrates, aconitate, shikimate, serine, glycine, proline and eight other amino acids increased, and leaf starch, malate, fumarate, 2-oxoglutarate and seven amino acids decreased with drought. Drought-dependent decreases of nitrate, alanine and aspartate were impacted by limiting nitrogen. Transcript levels of 14 stress-related maize genes responded to drought but this was delayed or modified by CO(2) enrichment. Overall, CO(2) enrichment eliminated many early responses of maize metabolites and transcripts to water stress but was less effective when drought was severe. Four metabolite groupings were identified by clustering analysis. These groupings included compounds that decreased with water stress, compounds involved in osmotic adjustment and aromatic compounds that alleviate oxidative stress. Metabolite changes also supported the suggestion that water stress inhibited C(4) photosynthesis and induced photorespiration.
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Claims 16
Claim · model-written summary
Elevated CO(2) delayed drought induced decreases in soil water content, leaf water potential, net CO(2) assimilation and stomatal conductance by approximately 2 days.
- Treatment
- CO(2) enrichmente1
- Outcome
- soil water content, leaf water potential, net CO(2) assimilation and stomatal conductancee1
- Direction
- delayede1
- Value
- approximately 2 dayse1
- Comparator
- ambient (38 Pa)e0
Zea maysOrganisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Maize (Zea mays) was grown in indoor chambers with ambient (38 Pa) and elevated (70 Pa) CO(2) .”
e1“Decreases of soil water content, leaf water potential, net CO(2) assimilation and stomatal conductance as a result of drought were delayed approximately 2 days by CO(2) enrichment”
Claim · model-written summary
Drought altered concentrations of 28 of 33 maize leaf metabolites.
Not reportedComparatorDirection
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Maize (Zea mays) was grown in indoor chambers”
e1“Concentrations of 28 of 33 leaf metabolites were altered by drought”
Claim · model-written summary
Drought increased soluble carbohydrates, aconitate and shikimate.
Not reportedTreatmentComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Maize (Zea mays) was grown”
e1“Soluble carbohydrates, aconitate, shikimate, serine, glycine, proline and eight other amino acids increased”
Claim · model-written summary
Drought increased serine, glycine and proline.
Not reportedTreatmentComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Maize (Zea mays) was grown”
e1“serine, glycine, proline and eight other amino acids increased”
Claim · model-written summary
Drought increased eight other amino acids.
Not reportedTreatmentComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Maize (Zea mays) was grown”
e1“proline and eight other amino acids increased”
Claim · model-written summary
Drought decreased leaf starch, malate and fumarate.
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Maize (Zea mays) was grown”
e1“leaf starch, malate, fumarate, 2-oxoglutarate and seven amino acids decreased with drought”
Claim · model-written summary
Drought decreased 2-oxoglutarate and seven amino acids.
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Maize (Zea mays) was grown”
e1“2-oxoglutarate and seven amino acids decreased with drought”
Claim · model-written summary
Limiting nitrogen affected drought dependent decreases of nitrate, alanine and aspartate.
Not reportedComparatorDirection
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Maize (Zea mays) was grown”
e1“Drought-dependent decreases of nitrate, alanine and aspartate were impacted by limiting nitrogen”
Claim · model-written summary
Transcript levels of 14 stress related maize genes responded to drought.
Not reportedComparatorDirection
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Maize (Zea mays) was grown”
e1“Transcript levels of 14 stress-related maize genes responded to drought but this was delayed or modified by CO(2) enrichment”
Claim · model-written summary
CO(2) enrichment delayed or modified transcript responses of 14 stress related maize genes to drought.
- Treatment
- CO(2) enrichmente1
- Outcome
- Transcript levels of 14 stress-related maize genese1
- Direction
- delayed or modifiede1
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Maize (Zea mays) was grown”
e1“Transcript levels of 14 stress-related maize genes responded to drought but this was delayed or modified by CO(2) enrichment”
Claim · model-written summary
CO(2) enrichment eliminated many early maize metabolite responses to water stress.
- Treatment
- CO(2) enrichmente0
- Outcome
- early responses of maize metabolitese0
- Direction
- eliminatede0
- Qualifier
- less effective when drought was severee0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“CO(2) enrichment eliminated many early responses of maize metabolites and transcripts to water stress but was less effective when drought was severe”
Claim · model-written summary
CO(2) enrichment eliminated many early maize transcript responses to water stress.
- Treatment
- CO(2) enrichmente0
- Outcome
- transcriptse0
- Direction
- eliminatede0
- Qualifier
- less effective when drought was severee0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“CO(2) enrichment eliminated many early responses of maize metabolites and transcripts to water stress but was less effective when drought was severe”
Claim · model-written summary
Clustering analysis identified four metabolite groupings.
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Maize (Zea mays) was grown”
e1“Four metabolite groupings were identified by clustering analysis”
Claim · model-written summary
The metabolite groupings included compounds that decreased with water stress, compounds involved in osmotic adjustment and aromatic compounds that alleviate oxidative stress.
- Outcome
- compounds that decreased with water stress, compounds involved in osmotic adjustment and aromatic compounds that alleviate oxidative stresse1
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Maize (Zea mays) was grown”
e1“These groupings included compounds that decreased with water stress, compounds involved in osmotic adjustment and aromatic compounds that alleviate oxidative stress”
Claim · model-written summary
Metabolite changes supported the suggestion that water stress inhibited C(4) photosynthesis.
- Treatment
- water stresse1
- Outcome
- C(4) photosynthesise1
- Direction
- inhibitede1
- Qualifier
- Metabolite changese1
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Maize (Zea mays) was grown”
e1“Metabolite changes also supported the suggestion that water stress inhibited C(4) photosynthesis and induced photorespiration”
Claim · model-written summary
Metabolite changes supported the suggestion that water stress induced photorespiration.
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Maize (Zea mays) was grown”
e1“Metabolite changes also supported the suggestion that water stress inhibited C(4) photosynthesis and induced photorespiration”
The same questions in other papers
co2 · physiology: photosynthesis · Zea mays (maize)Results differ
20 papers in the same direction as this paper · 12 in the opposite direction
- no effect
- no effect
- negative
29 papers more in this group
See all 33 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.