Studies on the Relation of the Leaves to the Roots in Rice Plant viewed from the Vascular Connection between them

[摘要] Some experiments were carried out to make clear the relation between the leaves and the roots. The results obtained are summarized as follows: 1) As shown in Fig. 1, adventitious root primordia were initiated at two levels in the nodal region. The root primordia initiated at the basal part of internode are called "upper roots" for convenience sake, and the other ones at the disc of insertion of leaf are called "lower roots". The upper root primordia at a given nodal region were initiated earlier than the lower ones at the disc of insertion of leaf above, and then both the primordia were finished the increase in number at about the same time (Fig. 2). 2) In nodal region, the upper root primordia were initiated from the median side to the wing side of the leaf above, and the lower root primordia, on the contrary, were initiated from the opposite side (Fig. 3 and 4). 3) As shown in Fig. 5, the degree of the elongationan of root primodia in nodal region showed the same tendency as the order of the initiation of root primordia. 4) After the emergence of root from the nodal region, as shown in Fig. 5, the growth was found similar to the results mentioned above. From the results described above, the reason of "phyton concept" is interesting to the writer.

[学科分类] 农业科学（综合）