Abstract
A rice husk restricts the grain development physically. We examined the correlation of the total husk volume on a panicle, a parameter of yield capacity, with the nitrogen concentration (per dry weight) and the dry weight of the above-ground part of the plant, using single-stem-trained japonica rice (cv. Nipponbare) plants. The growth of rice plants was regulated by shading at two levels and nitrogen application at three levels from about 40 days before the heading (about 10 days before the panicle initiation). The number of spikelets per dry weight of the above-ground part of the plant at the end of the spikelet differentiation stage was linearly correlated with the nitrogen concentration at that time. The ratio of the spikelet dry weight at heading to the dry weight of the above-ground part of the plant at the end of the spikelet differentiation stage increased as the nitrogen concentration increased at a low nitrogen concentration, but the increase of the ratio slowed down at a nitrogen concentration of 2%. Decrease in dry weight of the spikelet resulted in a decrease of lemma size. Therefore, the ratio of the total husk volume on a panicle to the plant dry weight at the end of spikelet differentiation stage also increased as the nitrogen concentration increased at a low nitrogen concentration, but the increase stopped at a nitrogen concentration of 2% in contrast to the ratio of the spikelet number to the dry weight of the plant. These results suggest that, to increase the total husk volume on a panicle by nitrogen application, dry-matter production must be increased by the nitrogen application.
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Claims 5
Claim · model-written summary
Spikelets per aboveground dry weight correlated linearly with nitrogen concentration.
- Taxon
- Japonica Rice
_by_Augustus_Binu.jpg?width=60)
Oryza sativa Japonica Groupt0 - Compound
- nitrogen concentratione0
- Outcome
- number of spikelets per dry weighte0
Not reportedDirection
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
_by_Augustus_Binu.jpg?width=500)
Verbatim
t0“Japonica Rice”
e0“The number of spikelets per dry weight of the above-ground part of the plant at the end of the spikelet differentiation stage was linearly correlated with the nitrogen concentration at that time.”
Claim · model-written summary
Spikelet dry weight ratio rose with nitrogen at low concentrations, then increased more slowly at 2%.
- Taxon
- Japonica RiceOryza sativa Japonica Groupt0
- Compound
- nitrogen concentratione0
- Outcome
- ratio of the spikelet dry weight at heading to the dry weight of the above-ground part of the plante0
- Direction
- increasede0
- Value
- 2%e0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
t0“Japonica Rice”
e0“The ratio of the spikelet dry weight at heading to the dry weight of the above-ground part of the plant at the end of the spikelet differentiation stage increased as the nitrogen concentration increased at a low nitrogen concentration, but the increase of the ratio slowed down at a nitrogen concentration of 2%.”
Claim · model-written summary
Reduced spikelet dry weight corresponded to reduced lemma size.
- Taxon
- Japonica RiceOryza sativa Japonica Groupt0
- Organ / stage
- spikelete0
- Outcome
- lemma sizee0
- Direction
- decreasee0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
t0“Japonica Rice”
e0“Decrease in dry weight of the spikelet resulted in a decrease of lemma size.”
Claim · model-written summary
Total husk volume relative to plant dry weight increased with nitrogen at low concentrations but plateaued at 2%.
- Taxon
- Japonica RiceOryza sativa Japonica Groupt0
- Compound
- nitrogen concentratione0
- Outcome
- ratio of the total husk volume on a panicle to the plant dry weighte0
- Direction
- increasede0
- Value
- 2%e0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
t0“Japonica Rice”
e0“the ratio of the total husk volume on a panicle to the plant dry weight at the end of spikelet differentiation stage also increased as the nitrogen concentration increased at a low nitrogen concentration, but the increase stopped at a nitrogen concentration of 2%”
Claim · model-written summary
The authors suggest greater dry matter production is needed for nitrogen application to raise total husk volume.
- Taxon
- Japonica RiceOryza sativa Japonica Groupt0
- Treatment
- nitrogen applicatione0
- Outcome
- total husk volume on a paniclee0
- Qualifier
- dry-matter productione0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
t0“Japonica Rice”
e0“to increase the total husk volume on a panicle by nitrogen application, dry-matter production must be increased by the nitrogen application.”