Differentiation and development of the branching of panicle with reference to the number of spikelets in rice [Oryza sativa]
1999
Fukushima, A. (Tokyo Univ. (Japan))
The developmental process of young panicles was observed to estimate the diameters of young panicle primordium and the diameters of primary branch primordium. The effects of these diameters on the branching structure of panicle were then compared between japonica and indica cultivars. Irrespective of these cultivar groups, the diameters of young panicle primordium and of primary branch primordium were positively related to the number of primary branches and the ratio of the number of secondary branches to the number of primary branches respectively. These results suggest that the number of each order branches is affected by the size of the field where they can differentiate. The ratio of the diameters of primary branch primordium to that of young panicle primordium was larger in indica cultivars than in japonica cultivars. As a result, the ratio of the number of high-order branches was larger in indica cultivars than in japonica cultivars. Furthermore, the developmental factors determining the branching structures of panicles were discussed by analyzing the relationship between the morphological traits of the neck internodes and the branching structures of panicles. These results suggest the number of spikelets per panicle is dependent on the diameters of the young panicle primordium regulating the number of primary branches and on the ratio of the diameters of primary branch primordium to that of young panicle primordium regulating the ratio of the number of high-order b
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