Abstract
Rice varietal differences were compared between japonica type (JAT) and indica type (INT) and between panicle number type (PNT) and panicle weight type (PWT) in terms of tiller and panicle development. Rice varieties PNT-JAT Hinohikari, PWT-JAT Akenohoshi, PNT-INT IR36, and PWT-INT Takanari were used in the field experiments. Tiller bud formation and tiller leaf emergence occurred slightly later in the PWT than in the PNT varieties. These parameters occurred slightly earlier in the INT than in the JAT varieties. The maximum number of tillers was greater in IR36 than in Takanari, Hinohikari, and Akenohoshi. The number of panicles per unit area (PN) was greater in IR36 and Hinohikari than in Akenohoshi and Takanari. The widths of the shoot apical meristem (SAM) just before panicle initiation were in the order of Akenohoshi > Hinohikari = Takanari > IR36. The number of spikelets per panicle (SN) was in the order of Takanari = Akenohoshi > IR36 > Hinohikari. In conclusion, the PWT varieties, which had relatively wider SAM, presented with the promotion of main shoot development and the suppression of tiller development. Consequently, PN decreased and SN increased in PWT varieties. INT varieties presented with the promotion of tiller and rachis branch development, which resulted in increases in both PN and SN. These developmental factors may determine varietal differences in the total number of spikelets per unit area. Abbreviations CGR: crop growth rate; DEL: differences between the numbers of emerged leaves in the tiller and those in the main shoot; DIL: differences between the number of initiated leaves in the tiller and those in the main shoot; INT: indica type; JAT: japonica type; MLAI: mean leaf area index; NAR: net assimilation rate; PN: the number of panicles per unit area; SN: the number of spikelets per panicle; PNT: panicle number type; PWT: panicle weight type; SAM: shoot apical meristem; TSN: the total number of spikelets per unit area
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Claims 10
Claim · model-written summary
Tiller bud formation and leaf emergence were later in PWT than PNT varieties.
- Material
- PWTe0
- Outcome
- Tiller bud formation and tiller leaf emergencee0
- Direction
- latere0
- Comparator
- PNT varietiese0
Not reportedTaxon
Verbatim
e0“Tiller bud formation and tiller leaf emergence occurred slightly later in the PWT than in the PNT varieties”
Claim · model-written summary
Those traits appeared earlier in INT than JAT varieties.
Not reportedTaxon
Verbatim
e0“These parameters occurred slightly earlier in the INT than in the JAT varieties”
Claim · model-written summary
IR36 had the greatest maximum tiller number.
- Material
- IR36e0
- Outcome
- maximum number of tillerse0
- Direction
- greatere0
- Comparator
- Takanari, Hinohikari, and Akenohoshie0
Not reportedTaxon
Verbatim
e0“The maximum number of tillers was greater in IR36 than in Takanari, Hinohikari, and Akenohoshi”
Claim · model-written summary
IR36 and Hinohikari had more panicles per unit area.
- Material
- IR36 and Hinohikarie0
- Outcome
- number of panicles per unit areae0
- Direction
- greatere0
- Comparator
- Akenohoshi and Takanarie0
Not reportedTaxon
Verbatim
e0“The number of panicles per unit area (PN) was greater in IR36 and Hinohikari than in Akenohoshi and Takanari”
Claim · model-written summary
Shoot apical meristem width ranked Akenohoshi highest and IR36 lowest.
- Material
- Akenohoshie0
- Organ / stage
- shoot apical meristeme0
- Outcome
- widths of the shoot apical meristeme0
Not reportedTaxonDirection
Verbatim
e0“The widths of the shoot apical meristem (SAM) just before panicle initiation were in the order of Akenohoshi > Hinohikari = Takanari > IR36”
Claim · model-written summary
Spikelets per panicle ranked Takanari and Akenohoshi highest.
Not reportedTaxonDirection
Verbatim
e0“The number of spikelets per panicle (SN) was in the order of Takanari = Akenohoshi > IR36 > Hinohikari”
Claim · model-written summary
PWT varieties promoted main shoot development and suppressed tiller development.
- Material
- PWT varietiese0
- Outcome
- promotion of main shoot development and the suppression of tiller developmente0
Not reportedTaxonDirection
Verbatim
e0“the PWT varieties, which had relatively wider SAM, presented with the promotion of main shoot development and the suppression of tiller development”
Claim · model-written summary
PWT varieties had lower PN and higher SN.
Not reportedTaxon
Verbatim
e0“Consequently, PN decreased and SN increased in PWT varieties”
Claim · model-written summary
INT varieties promoted tiller and rachis branch development.
Not reportedTaxonDirection
Verbatim
e0“INT varieties presented with the promotion of tiller and rachis branch development”
Claim · model-written summary
INT varieties increased panicle number and spikelets per panicle.
Not reportedTaxon
Verbatim
e0“which resulted in increases in both PN and SN”