Abstract
The increased supply of photosynthate from maternal tissue is known to promote grain growth in several crop species. However, the effect of increasing photosynthate supply on grain growth receives little attention in rice. This study was aimed at evaluating the effect of increasing photosynthate supply through CO 2 enrichment (650 μl I ‐1 ) on grain growth in three rice cultivars differing in grain size. CO 2 enrichment was applied to the pot‐grown plants between anthesis and final harvest. The results indicated that high CO 2 treatment enhanced the CO 2 exchange rate of leaf tissue, and subsequently increased the sucrose level of peduncle exudate, but it did not promote starch accumulation in the developing grains. This phenomenon was linked to the poor CO 2 responses for the grain activities of sucrose synthase, UDP‐glucose pyrophosphorylase. ADP‐glucose pyrophosphorylase, and starch synthases involved in the conversion of sucrose to starch. Significant cultivar differences also existed for the activities of sucrose to starch conversion enzymes with larger grain size cultivars tending to have higher enzymes activities (expressed on a grain basis), resulting in a greater carbohydrate accumulation.
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Claims 6
Claim · model-written summary
High CO2 enhanced leaf CO2 exchange rate.
- Taxon
- rice
Oryza sativat0 - Organ / stage
- leaf tissuee0
- Treatment
- high CO 2 treatmente0
- Outcome
- CO 2 exchange ratee0
- Direction
- enhancede0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
t0“rice”
e0“high CO 2 treatment enhanced the CO 2 exchange rate of leaf tissue”
Claim · model-written summary
High CO2 increased sucrose in peduncle exudate.
- Taxon
- riceOryza sativat0
- Treatment
- CO2‐enrichedt1
- Outcome
- sucrose level of peduncle exudatee0
- Direction
- increasede0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
t0“rice”
t1“CO2‐enriched developing rice grains”
e0“increased the sucrose level of peduncle exudate”
Claim · model-written summary
High CO2 did not promote starch accumulation in developing grains.
- Taxon
- riceOryza sativat0
- Treatment
- CO2‐enrichedt0
- Outcome
- starch accumulation in the developing grainse0
- Direction
- did not promotee0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
t0“CO2‐enriched developing rice grains”
e0“it did not promote starch accumulation in the developing grains”
Claim · model-written summary
Grain activities of four sucrose to starch enzymes responded poorly to CO2.
- Taxon
- riceOryza sativat0
- Treatment
- CO 2e0
- Gene
- sucrose synthase, UDP‐glucose pyrophosphorylase. ADP‐glucose pyrophosphorylase, and starch synthasese0
- Outcome
- grain activitiese0
- Direction
- poor CO 2 responsese0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
t0“rice”
e0“poor CO 2 responses for the grain activities of sucrose synthase, UDP‐glucose pyrophosphorylase. ADP‐glucose pyrophosphorylase, and starch synthases”
Claim · model-written summary
Larger grain cultivars tended to have higher sucrose to starch enzyme activity.
- Taxon
- riceOryza sativat0
- Material
- larger grain size cultivarse0
- Outcome
- enzymes activitiese0
- Direction
- highere0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
t0“rice”
e0“larger grain size cultivars tending to have higher enzymes activities (expressed on a grain basis)”
Claim · model-written summary
Larger grain cultivars accumulated more carbohydrate.
- Taxon
- riceOryza sativat0
- Material
- larger grain size cultivarse0
- Outcome
- carbohydrate accumulatione0
- Direction
- greatere0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
t0“rice”
e0“larger grain size cultivars tending to have higher enzymes activities (expressed on a grain basis), resulting in a greater carbohydrate accumulation”
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See all 43 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.