水稲の地上部の形質におよぼす根の役割に関する研究 : 第3報 要素別根の形態と程基の太さおよび一穂穎花数との関係

抄録

The object of this study was to know how the diameter of the first elongated internode and diameter of loots formed at each leaf-shoot unit are related to the number of spikelets per panicle of main culm and tillers in individual or group of varieties. The results of study were as follows : (1) A close positive correlation was found to exist between the number of spikelets per panicle, and the diameter of roots formed at the 3rd, 4th, 5th and 6th leaf-shoot units. (2) The positive correlation was recognized between the number of spikelets per panicle and the number and diameter of vascular-bundles in roots formed at the 3rd leaf-shot units. (3) It was detected that the number of spikelets per panicle was those positively and significantly correlated with the diameter of roots, especially formed at the 3rd leaf-shoot units, the diameter of the first elongated inter-node at the base of the culm and the diameter of neck-node. The same tendency was observed even among varieties or within tillers of one same hill.