Abstract
The relationship between leaf blade elongation rates (LER) and sucrose-phosphate synthase (SPS) activity was investigated at different times during ontogeny of rice (Oryza sativa L. cv Jarrah) grown in flooded soil at either 350 or 700 [mu]L CO2 L-1. High CO2 concentrations increased LER of expanding blades and in vivo activity (Vlimiting) SPS activity of expanded blades during the early vegetative stage (21 d after planting [DAP]), when tiller number was small and growing blades were strong carbohydrate sinks. Despite a constant light environment, there was a distinct diurnal pattern in LER, Vlimiting SPS activity, and concentration of soluble sugars, with an increase in the early part of the light period and a decrease later in the light period. The strong correlation (r = 0.65) between LER and Vlimiting SPS activity over the diurnal cycle indicated that SPS activity played an important role in controlling blade growth. The higher Vlimiting SPS activity at elevated CO2 at 21 DAP was caused by an increase in the activation state of the enzyme rather than an increase in Vmax. Fructose and glucose accumulated to a greater extent than sucrose at high CO2 and may have been utilized for synthesis of cell-wall components, contributing to higher specific leaf weight. By the mid-tillering stage (42 DAP), CO2 enrichment enhanced Vlimiting and Vmax activities of source blades. Nevertheless, LER was depressed by high CO2, probably because tillers were stronger carbohydrate sinks than growing blades.
Abstract from the paper’s OpenAlex record, shown for indexing and research. Copyright remains with the authors or the publisher. Read at the source ↗
The text the model read, with the source record’s inline markup (italics, sub- and superscripts) rendered and its character entities decoded; quote offsets refer to the raw text.
Claims 10
Claim · model-written summary
High CO2 concentrations increased the leaf elongation rate of expanding rice blades during the early vegetative stage (21 DAP).
- Taxon
- Rice
Oryza sativat0 - Organ / stage
- early vegetative stagee0
- Treatment
- High CO2 concentrationse0
- Outcome
- LER of expanding bladese0
- Direction
- increasede0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
t0“Rice”
e0“High CO2 concentrations increased LER of expanding blades and in vivo activity (Vlimiting) SPS activity of expanded blades during the early vegetative stage (21 d after planting [DAP])”
Claim · model-written summary
High CO2 concentrations increased in vivo (Vlimiting) SPS activity of expanded rice blades during the early vegetative stage (21 DAP).
- Taxon
- RiceOryza sativat0
- Organ / stage
- early vegetative stagee0
- Treatment
- High CO2 concentrationse0
- Outcome
- in vivo activity (Vlimiting) SPS activity of expanded bladese0
- Direction
- increasede0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
t0“Rice”
e0“High CO2 concentrations increased LER of expanding blades and in vivo activity (Vlimiting) SPS activity of expanded blades during the early vegetative stage (21 d after planting [DAP])”
Claim · model-written summary
In rice under constant light there was a distinct diurnal pattern in leaf elongation rate, Vlimiting SPS activity and soluble sugar concentration, increasing early in the light period and decreasing later.
- Taxon
- RiceOryza sativat0
- Outcome
- diurnal pattern in LER, Vlimiting SPS activity, and concentration of soluble sugarse0
- Qualifier
- an increase in the early part of the light period and a decrease later in the light periode0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
t0“Rice”
e0“there was a distinct diurnal pattern in LER, Vlimiting SPS activity, and concentration of soluble sugars, with an increase in the early part of the light period and a decrease later in the light period”
Claim · model-written summary
Leaf elongation rate and Vlimiting SPS activity were strongly correlated (r = 0.65) over the diurnal cycle in rice.
- Taxon
- RiceOryza sativat0
- Gene
- Vlimiting SPS activitye0
- Outcome
- LERe0
- Value
- r = 0.65e0
Not reportedDirection
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
t0“Rice”
e0“The strong correlation (r = 0.65) between LER and Vlimiting SPS activity over the diurnal cycle”
Claim · model-written summary
The authors conclude that SPS activity played an important role in controlling blade growth in rice.
- Taxon
- RiceOryza sativat0
- Gene
- SPSe0
- Outcome
- blade growthe0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
t0“Rice”
e0“indicated that SPS activity played an important role in controlling blade growth”
Claim · model-written summary
The higher Vlimiting SPS activity at elevated CO2 at 21 DAP was caused by an increase in the activation state of the enzyme rather than an increase in Vmax.
- Taxon
- RiceOryza sativat0
- Treatment
- elevated CO2e0
- Outcome
- higher Vlimiting SPS activitye0
- Qualifier
- an increase in the activation state of the enzyme rather than an increase in Vmaxe0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
t0“Rice”
e0“The higher Vlimiting SPS activity at elevated CO2 at 21 DAP was caused by an increase in the activation state of the enzyme rather than an increase in Vmax”
Claim · model-written summary
Fructose and glucose accumulated to a greater extent than sucrose at high CO2 in rice.
- Taxon
- RiceOryza sativat0
- Treatment
- high CO2e0
- Outcome
- Fructose and glucose accumulated to a greater extent than sucrosee0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
t0“Rice”
e0“Fructose and glucose accumulated to a greater extent than sucrose at high CO2”
Claim · model-written summary
The accumulated fructose and glucose may have been utilized for synthesis of cell-wall components, contributing to higher specific leaf weight.
- Taxon
- RiceOryza sativat0
- Compound
- Fructose and glucosee0
- Outcome
- higher specific leaf weighte0
- Qualifier
- utilized for synthesis of cell-wall componentse0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
t0“Rice”
e0“Fructose and glucose accumulated to a greater extent than sucrose at high CO2 and may have been utilized for synthesis of cell-wall components, contributing to higher specific leaf weight”
Claim · model-written summary
At the mid-tillering stage (42 DAP), CO2 enrichment enhanced Vlimiting and Vmax activities of source blades in rice.
- Taxon
- RiceOryza sativat0
- Organ / stage
- mid-tillering stagee0
- Treatment
- CO2 enrichmente0
- Outcome
- Vlimiting and Vmax activities of source bladese0
- Direction
- enhancede0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
t0“Rice”
e0“By the mid-tillering stage (42 DAP), CO2 enrichment enhanced Vlimiting and Vmax activities of source blades”
Claim · model-written summary
Leaf elongation rate was depressed by high CO2 at the mid-tillering stage, probably because tillers were stronger carbohydrate sinks than growing blades.
- Taxon
- RiceOryza sativat0
- Treatment
- high CO2e0
- Outcome
- LERe0
- Direction
- depressede0
- Qualifier
- probably because tillers were stronger carbohydrate sinks than growing bladese0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
t0“Rice”
e0“Nevertheless, LER was depressed by high CO2, probably because tillers were stronger carbohydrate sinks than growing blades”
The same questions in other papers
co2 · growth · Oryza sativa (rice)Positive and negative results
99 papers in the same direction as this paper · 23 in the opposite direction · 1 reporting no difference from an alternative
- positive
- positive
- no effect
120 papers more in this group
See all 124 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.