Branching structure of panicle with reference to the number of spikelets in rice [Oryza sativa]
1999
Fukushima, A. (Tokyo Univ. (Japan))
The branching structure of the panicles of eight japonica and eight indica cultivars was compared after estimating the number and position of the differentiated branches and spikelets. The secondary and tertiary branch numbers on each primary branch were almost constant along the rachis in any cultivar, but they decreased at the apical part. The ratio of the number of high-order branches was larger in indica cultivars than in japonica cultivars, besides IR65598-112-2, where the ratio of high-order branches; especially the ratio of the tertiary branch number to the secondary branch number, was extremely large. The relationship between the morphological traits of the neck internode and the branching structure of panicles was different between cultivar groups. These results suggest that the differences of branching structure between japonica and indica cultivars are caused by the differences in the developmental pattern of branches. The relationship between these branching structures, and the number of spikelets per panicle was analyzed. As a result, the differences in the spikelet number per panicle among each cultivar group and between cultivar groups seemed to depend on the number of primary branches and on the ratio of the number of high-order branches, respectively
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