Abstract
To study the effects of growing rice (Oryza sativa L.) leaves under the treatment of the short-term elevated CO(2) during the period of sink-source transition, several physiological processes such as dynamic changes in photosynthesis, photosynthate accumulation, enzyme activities (sucrose phosphate synthase (SPS), and sucrose synthase (SS)), and their specific gene (sps1 and RSus1) expressions in both mature and developing leaf were measured. Rice seedlings with fully expanded sixth leaf (marked as the source leaf, L6) were kept in elevated (700 micromol/mol) and ambient (350 mol/L) CO(2) until the 7th leaf (marked as the sink leaf, L7) fully expanded. The results demonstrated that elevated CO(2) significantly increased the rate of leaf elongation and biomass accumulation of L7 during the treatment without affecting the growth of L6. However, in both developing and mature leaves, net photosynthetic assimilation rate (A), all kinds of photosynthate contents such as starch, sucrose and hexose, activities of SPS and SS and transcript levels of sps1 and RSus1 were significantly increased under elevated CO(2) condition. Results suggested that the elevated CO(2) had facilitated photosynthate assimilation, and increased photosynthate supplies from the source leaf to the sink leaf, which accelerated the growth and sink-source transition in new developing sink leaves. The mechanisms of SPS regulation by the elevated CO(2) was also discussed.
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Claims 8
Claim · model-written summary
Elevated CO2 increased developing leaf elongation.
- Taxon
- rice
Oryza sativae1 - Organ / stage
- L7e0
- Treatment
- elevated CO(2)e0
- Outcome
- rate of leaf elongatione0
- Direction
- increasede0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“elevated CO(2) significantly increased the rate of leaf elongation and biomass accumulation of L7 during the treatment without affecting the growth of L6”
e1“rice (Oryza sativa L.)”
Claim · model-written summary
Elevated CO2 increased developing leaf biomass accumulation.
- Taxon
- riceOryza sativae1
- Organ / stage
- L7e0
- Treatment
- elevated CO(2)e0
- Outcome
- biomass accumulatione0
- Direction
- increasede0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“elevated CO(2) significantly increased the rate of leaf elongation and biomass accumulation of L7 during the treatment without affecting the growth of L6”
e1“rice (Oryza sativa L.)”
Claim · model-written summary
Elevated CO2 did not affect mature leaf growth.
- Taxon
- riceOryza sativae1
- Organ / stage
- L6e0
- Treatment
- elevated CO(2)e0
- Outcome
- growth of L6e0
- Direction
- without affectinge0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“elevated CO(2) significantly increased the rate of leaf elongation and biomass accumulation of L7 during the treatment without affecting the growth of L6”
e1“rice (Oryza sativa L.)”
Claim · model-written summary
Elevated CO2 raised net photosynthetic assimilation in mature and developing leaves.
- Taxon
- riceOryza sativae1
- Organ / stage
- developing and mature leavese0
- Treatment
- elevated CO(2)e0
- Outcome
- net photosynthetic assimilation rate (A)e0
- Direction
- increasede0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“in both developing and mature leaves, net photosynthetic assimilation rate (A), all kinds of photosynthate contents such as starch, sucrose and hexose, activities of SPS and SS and transcript levels of sps1 and RSus1 were significantly increased under elevated CO(2) condition”
e1“rice (Oryza sativa L.)”
Claim · model-written summary
Elevated CO2 raised starch, sucrose and hexose contents in both leaf types.
- Taxon
- riceOryza sativae1
- Organ / stage
- developing and mature leavese0
- Treatment
- elevated CO(2)e0
- Outcome
- starch, sucrose and hexosee0
- Direction
- increasede0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“in both developing and mature leaves, net photosynthetic assimilation rate (A), all kinds of photosynthate contents such as starch, sucrose and hexose, activities of SPS and SS and transcript levels of sps1 and RSus1 were significantly increased under elevated CO(2) condition”
e1“rice (Oryza sativa L.)”
Claim · model-written summary
Elevated CO2 raised SPS and SS activities.
- Taxon
- riceOryza sativae1
- Treatment
- elevated CO(2)e0
- Gene
- SPS and SSe0
- Outcome
- activities of SPS and SSe0
- Direction
- increasede0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“in both developing and mature leaves, net photosynthetic assimilation rate (A), all kinds of photosynthate contents such as starch, sucrose and hexose, activities of SPS and SS and transcript levels of sps1 and RSus1 were significantly increased under elevated CO(2) condition”
e1“rice (Oryza sativa L.)”
Claim · model-written summary
Elevated CO2 raised sps1 and RSus1 transcript levels.
- Taxon
- riceOryza sativae1
- Treatment
- elevated CO(2)e0
- Gene
- sps1 and RSus1e0
- Outcome
- transcript levels of sps1 and RSus1e0
- Direction
- increasede0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“in both developing and mature leaves, net photosynthetic assimilation rate (A), all kinds of photosynthate contents such as starch, sucrose and hexose, activities of SPS and SS and transcript levels of sps1 and RSus1 were significantly increased under elevated CO(2) condition”
e1“rice (Oryza sativa L.)”
Claim · model-written summary
Authors inferred elevated CO2 increased photosynthate flow from source to sink leaves and accelerated their transition.
- Taxon
- riceOryza sativae1
- Treatment
- elevated CO(2)e0
- Outcome
- sink-source transitione0
- Qualifier
- increased photosynthate suppliese0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“elevated CO(2) had facilitated photosynthate assimilation, and increased photosynthate supplies from the source leaf to the sink leaf, which accelerated the growth and sink-source transition in new developing sink leaves”
e1“rice (Oryza sativa L.)”
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