Abstract
Atmospheric CO 2 elevation promotes peanut biomass accumulation, yet the underlying molecular mechanisms remain unclear. This study investigated the physiological and molecular responses of two peanut cultivars (JH2 and JH54) to elevated CO 2 (EC, 700 μmol·mol –1 ) versus ambient CO 2 (CK, 400 μmol·mol –1 ) in open-top chambers, by analyzing photosynthetic traits, aboveground biomass, and leaf transcriptomic/metabolomic profiles. The results showed that EC significantly increased net photosynthetic rate, intercellular CO 2 concentration, water use efficiency and biomass, but reduced stomatal conductance and pigment contents, with upregulated photosynthesis-related genes. Integrated multiomics revealed reprogrammed salicylic acid/abscisic acid signaling (lowering stomatal conductance and improving water use efficiency) and galactose metabolism (facilitating EC acclimation). Collectively, peanuts adapt to EC via coordinated transcriptomic-metabolomic adjustments in photosynthesis, hormone signaling and carbon metabolic reprogramming (especially galactose metabolism), providing a multilevel mechanistic insight into peanut’s responses to rising atmospheric CO 2 .
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Claims 9
Claim · model-written summary
Elevated CO 2 significantly increased peanut net photosynthetic rate.
- Taxon
- peanut
Arachis hypogaeae2 - Treatment
- elevated CO 2 (EC, 700 μmol·mol –1 )e1
- Outcome
- net photosynthetic ratee0
- Direction
- increasede0
- Comparator
- ambient CO 2 (CK, 400 μmol·mol –1 )e1
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“EC significantly increased net photosynthetic rate, intercellular CO 2 concentration, water use efficiency and biomass”
e1“elevated CO 2 (EC, 700 μmol·mol –1 ) versus ambient CO 2 (CK, 400 μmol·mol –1 )”
e2“peanut cultivars”
Claim · model-written summary
Elevated CO 2 significantly increased peanut intercellular CO 2 concentration.
- Taxon
- peanutArachis hypogaeae2
- Treatment
- elevated CO 2 (EC, 700 μmol·mol –1 )e1
- Outcome
- intercellular CO 2 concentratione0
- Direction
- increasede0
- Comparator
- ambient CO 2 (CK, 400 μmol·mol –1 )e1
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“EC significantly increased net photosynthetic rate, intercellular CO 2 concentration, water use efficiency and biomass”
e1“elevated CO 2 (EC, 700 μmol·mol –1 ) versus ambient CO 2 (CK, 400 μmol·mol –1 )”
e2“peanut cultivars”
Claim · model-written summary
Elevated CO 2 significantly increased peanut water use efficiency.
- Taxon
- peanutArachis hypogaeae2
- Treatment
- elevated CO 2 (EC, 700 μmol·mol –1 )e1
- Outcome
- water use efficiencye0
- Direction
- increasede0
- Comparator
- ambient CO 2 (CK, 400 μmol·mol –1 )e1
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“EC significantly increased net photosynthetic rate, intercellular CO 2 concentration, water use efficiency and biomass”
e1“elevated CO 2 (EC, 700 μmol·mol –1 ) versus ambient CO 2 (CK, 400 μmol·mol –1 )”
e2“peanut cultivars”
Claim · model-written summary
Elevated CO 2 significantly increased peanut biomass.
- Taxon
- peanutArachis hypogaeae2
- Treatment
- elevated CO 2 (EC, 700 μmol·mol –1 )e1
- Outcome
- biomasse0
- Direction
- increasede0
- Comparator
- ambient CO 2 (CK, 400 μmol·mol –1 )e1
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“EC significantly increased net photosynthetic rate, intercellular CO 2 concentration, water use efficiency and biomass”
e1“elevated CO 2 (EC, 700 μmol·mol –1 ) versus ambient CO 2 (CK, 400 μmol·mol –1 )”
e2“peanut cultivars”
Claim · model-written summary
Elevated CO 2 reduced peanut stomatal conductance.
- Taxon
- peanutArachis hypogaeae2
- Treatment
- elevated CO 2 (EC, 700 μmol·mol –1 )e1
- Outcome
- stomatal conductancee0
- Direction
- reducede0
- Comparator
- ambient CO 2 (CK, 400 μmol·mol –1 )e1
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“but reduced stomatal conductance and pigment contents”
e1“elevated CO 2 (EC, 700 μmol·mol –1 ) versus ambient CO 2 (CK, 400 μmol·mol –1 )”
e2“peanut cultivars”
Claim · model-written summary
Elevated CO 2 reduced peanut pigment contents.
- Taxon
- peanutArachis hypogaeae2
- Treatment
- elevated CO 2 (EC, 700 μmol·mol –1 )e1
- Outcome
- pigment contentse0
- Direction
- reducede0
- Comparator
- ambient CO 2 (CK, 400 μmol·mol –1 )e1
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“but reduced stomatal conductance and pigment contents”
e1“elevated CO 2 (EC, 700 μmol·mol –1 ) versus ambient CO 2 (CK, 400 μmol·mol –1 )”
e2“peanut cultivars”
Claim · model-written summary
Elevated CO 2 upregulated peanut photosynthesis-related genes.
- Taxon
- peanutArachis hypogaeae2
- Treatment
- elevated CO 2 (EC, 700 μmol·mol –1 )e1
- Outcome
- photosynthesis-related genese0
- Direction
- upregulatede0
- Comparator
- ambient CO 2 (CK, 400 μmol·mol –1 )e1
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“with upregulated photosynthesis-related genes”
e1“elevated CO 2 (EC, 700 μmol·mol –1 ) versus ambient CO 2 (CK, 400 μmol·mol –1 )”
e2“peanut cultivars”
Claim · model-written summary
Elevated CO 2 reprogrammed salicylic acid and abscisic acid signaling, interpreted as lowering stomatal conductance and improving water use efficiency.
- Taxon
- peanutArachis hypogaeae1
- Compound
- salicylic acid/abscisic acide0
- Outcome
- stomatal conductance and improving water use efficiencye0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“reprogrammed salicylic acid/abscisic acid signaling (lowering stomatal conductance and improving water use efficiency)”
e1“peanut cultivars”
Claim · model-written summary
Elevated CO 2 reprogrammed galactose metabolism, interpreted as facilitating acclimation.
- Taxon
- peanutArachis hypogaeae1
- Outcome
- EC acclimatione0
- Qualifier
- galactose metabolisme0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“galactose metabolism (facilitating EC acclimation)”
e1“peanut cultivars”
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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.