Studies on the Correlation between Number of the Vascular Bundles in Leaf and Arrangement of the Roots at the Node in Rice Plants

[摘要] The author has been studied on the growth of the roots in connection with growth of the above-ground parts in rice and wheat plants. Thus, the author found that the close relationship exists between growth of the roots and growth of the above-ground parts by external morphological and partial physiological studies. In this experiment with rice plants, the author observed the connection and development of the vascular bundles in the leaves and the roots, especially the correlation between the vascular bundles which down to the node from the leaf and arrangement of the roots. 1) The vascular bundles in the internode run longitudinally with parallel in each other. And the author found that the nodal plexus developed exceedingly at the node and connected across with vascular bundles which down to the node from the leaf. Thus, we can assume that the node is fitted to controll the movement of water and nutrients. 2) The roots always developed from the outermost peripheral bundles. When the internode didn't elongate, the outermost peripheral bundles developed both in the internode and in the node. Therefors the roots emergenced from these two parts. 3) However when the internode elongated, the roots do not emergence from the internode but only the node. In that case, judging from the fact that the vascular bundles, which run to the leaf, and the roots in the same node branched at the same time, we recognized the fact that the number of the vascular bundles and the roots primordia were almost equally. 4) Considering from these results, the author found that not only the number of vascular bundles which run to the leaf and the roots at the successive node showed the Whigh correlation, but also they have close relationship in their growth.

[学科分类] 农业科学（综合）