Abstract
SummaryA pot experiment was conducted to analyze the relationship between the size of each apical dome (AD) and the numbers of differentiated primary rachis-branches (PBs) and spikelets. Two rice cultivars were used : one was a heavy-panicle type ‘Akenohoshi’ and the other was a many-tillering type ‘Nipponbare’. Rice plants were applied nitrogen (N) at various rates (75-600mg N pot–1 week–1) during the vegetative stage. The base diameter and the height of ADs were measured at the panicle initiation (PI) stage. At heading, the numbers of differentiated PBs, secondary rachis-branches (SBs), and spikelets were counted. The N treatment increased shoot N concentration in both cultivars. The N treatment increased the base diameter of AD in Akenohoshi at the PI stage, but not in Nipponbare. The ADs in Akenohoshi had a base diameter about 6.2% larger on average than that in Nipponbare. The N treatment did not affect AD height. In Akenohoshi, the plants with a larger AD base diameter differentiated more PBs per panicle and then differentiated more SBs and spikelets than did those plants with a smaller AD diameter. However, in Nipponbare, the N treatments did not affect the number of differentiated PBs per panicle. These results suggest that the AD size at the PI stage, which is enlarged by higher N nutrition in the vegetative stage, is a determinant of the number of differentiated PBs and spikelets and that a larger AD size is responsible for a higher number of PBs and spikelets in Akenohoshi.
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Claims 9
Claim · model-written summary
Nitrogen treatment increased shoot nitrogen concentration in both cultivars.
- Taxon
- Rice
Oryza sativat0 - Treatment
- N treatmente0
- Outcome
- shoot N concentratione0
- Direction
- increasede0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“The N treatment increased shoot N concentration in both cultivars”
t0“Rice”
Claim · model-written summary
Nitrogen increased apical dome base diameter in Akenohoshi.
- Taxon
- RiceOryza sativat0
- Material
- Akenohoshie0
- Organ / stage
- PI stagee0
- Treatment
- N treatmente0
- Outcome
- base diameter of ADe0
- Direction
- increasede0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“The N treatment increased the base diameter of AD in Akenohoshi at the PI stage”
t0“Rice”
Claim · model-written summary
Nitrogen did not change apical dome base diameter in Nipponbare.
- Taxon
- RiceOryza sativat0
- Material
- Nipponbaree0
- Treatment
- N treatmente1
- Outcome
- base diameter of ADe1
- Direction
- note0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“but not in Nipponbare”
e1“The N treatment increased the base diameter of AD in Akenohoshi at the PI stage, but not in Nipponbare”
t0“Rice”
Claim · model-written summary
Akenohoshi apical domes averaged about 6.2% wider than Nipponbare domes.
- Taxon
- RiceOryza sativat0
- Material
- Akenohoshie0
- Outcome
- base diametere0
- Direction
- largere0
- Value
- 6.2%e0
- Comparator
- Nipponbaree0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“The ADs in Akenohoshi had a base diameter about 6.2% larger on average than that in Nipponbare”
t0“Rice”
Claim · model-written summary
Nitrogen treatment did not affect apical dome height.
- Taxon
- RiceOryza sativat0
- Treatment
- N treatmente0
- Outcome
- AD heighte0
- Direction
- did not affecte0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“The N treatment did not affect AD height”
t0“Rice”
Claim · model-written summary
Within Akenohoshi, larger apical domes differentiated more primary rachis branches.
- Taxon
- RiceOryza sativat0
- Material
- Akenohoshie0
- Outcome
- PBs per paniclee0
- Direction
- moree0
- Comparator
- larger AD base diametere0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“In Akenohoshi, the plants with a larger AD base diameter differentiated more PBs per panicle”
t0“Rice”
Claim · model-written summary
Within Akenohoshi, larger apical domes produced more secondary branches and spikelets.
- Taxon
- RiceOryza sativat0
- Material
- Akenohoshie0
- Outcome
- SBs and spikeletse0
- Direction
- moree0
- Comparator
- those plants with a smaller AD diametere0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“In Akenohoshi, the plants with a larger AD base diameter differentiated more PBs per panicle and then differentiated more SBs and spikelets than did those plants with a smaller AD diameter”
t0“Rice”
Claim · model-written summary
Nitrogen treatment did not affect primary branch number in Nipponbare.
- Taxon
- RiceOryza sativat0
- Material
- Nipponbaree0
- Treatment
- N treatmentse0
- Outcome
- number of differentiated PBs per paniclee0
- Direction
- did not affecte0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“in Nipponbare, the N treatments did not affect the number of differentiated PBs per panicle”
t0“Rice”
Claim · model-written summary
The authors infer apical dome size determines differentiated primary branches and spikelets.
- Taxon
- RiceOryza sativat0
- Organ / stage
- PI stagee0
- Outcome
- number of differentiated PBs and spikeletse0
- Qualifier
- AD sizee0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“the AD size at the PI stage, which is enlarged by higher N nutrition in the vegetative stage, is a determinant of the number of differentiated PBs and spikelets”
t0“Rice”
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