Abstract
Although the predicted enhanced photosynthetic rates of plants exposed to elevated [CO2] are expected to increase carbohydrate and plant growth, recent findings have shown a complex regulation of these processes. The aim of this study was to determine the effect of elevated [CO2] on pathways leading to the main forms of leaf C storage (starch) and export (sucrose) and the implications of this increased [CO2] on photosynthetic performance of exclusively N2 fixing plants. For this purpose, exclusively N2-fixing pea plants were exposed to elevated [CO2] (1000 μmol mol−1 versus 360 μmol mol−1 CO2). The data obtained highlighted that plants exposed to elevated [CO2] were capable of maintaining hexose levels (involved in Rubisco down regulation) at control levels with the consequent avoidance of photosynthetic acclimation. More specifically, in plants exposed to elevated [CO2] there was an increase in the activity of pathways involved in the main forms of leaf C storage (starch) and export (sucrose). Furthermore, the study highlighted that although starch content increased by up to 40% under elevated [CO2], there was also an increase in the proteins and compounds involved in starch degradation. Such a finding, together with an increase in the activity of proteins involved in sucrose synthesis revealed that these plants up-regulated the sucrose synthesis pathway in order to meet the large nodule photoassimilate requirements. As a consequence, the study highlighted the relevance of controlling the activity of pathways that determine leaf cellular carbohydrate availability and how this is linked with C-demanding organs such as nodules.
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Claims 7
Claim · model-written summary
Elevated carbon dioxide maintained hexose at control levels.
- Taxon
- pea plants
Lathyrus oleraceust0 - Treatment
- elevated [CO2]e0
- Outcome
- hexose levelse0
- Direction
- maintaininge0
- Comparator
- control levelse0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“plants exposed to elevated [CO2] were capable of maintaining hexose levels (involved in Rubisco down regulation) at control levels”
t0“pea plants”
Claim · model-written summary
Elevated carbon dioxide avoided photosynthetic acclimation.
- Taxon
- pea plantsLathyrus oleraceust0
- Treatment
- elevated [CO2]e0
- Outcome
- avoidance of photosynthetic acclimatione0
Not reportedComparatorDirection
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“plants exposed to elevated [CO2] were capable of maintaining hexose levels (involved in Rubisco down regulation) at control levels with the consequent avoidance of photosynthetic acclimation”
t0“pea plants”
Claim · model-written summary
Elevated carbon dioxide increased activity of leaf starch storage and sucrose export pathways.
- Taxon
- pea plantsLathyrus oleraceust0
- Treatment
- elevated [CO2]e0
- Outcome
- activity of pathways involved in the main forms of leaf C storage (starch) and export (sucrose)e0
- Direction
- increasee0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“in plants exposed to elevated [CO2] there was an increase in the activity of pathways involved in the main forms of leaf C storage (starch) and export (sucrose)”
t0“pea plants”
Claim · model-written summary
Elevated carbon dioxide increased starch content by up to 40%.
- Taxon
- pea plantsLathyrus oleraceust0
- Treatment
- elevated [CO2]e0
- Outcome
- starch contente0
- Direction
- increasede0
- Value
- up to 40%e0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“starch content increased by up to 40% under elevated [CO2]”
t0“pea plants”
Claim · model-written summary
Elevated carbon dioxide increased proteins and compounds involved in starch degradation.
- Taxon
- pea plantsLathyrus oleraceust0
- Treatment
- elevated [CO2]e0
- Outcome
- proteins and compounds involved in starch degradatione0
- Direction
- increasee0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“under elevated [CO2], there was also an increase in the proteins and compounds involved in starch degradation”
t0“pea plants”
Claim · model-written summary
Proteins involved in sucrose synthesis increased in activity.
- Taxon
- pea plantsLathyrus oleraceust0
- Outcome
- activity of proteins involved in sucrose synthesise0
- Direction
- increasee0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“an increase in the activity of proteins involved in sucrose synthesis”
t0“pea plants”
Claim · model-written summary
The authors inferred upregulation of sucrose synthesis to meet nodule photoassimilate demand.
- Taxon
- pea plantsLathyrus oleraceust0
- Organ / stage
- nodulee0
- Outcome
- up-regulated the sucrose synthesis pathwaye0
- Qualifier
- large nodule photoassimilate requirementse0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“these plants up-regulated the sucrose synthesis pathway in order to meet the large nodule photoassimilate requirements”
t0“pea plants”
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