Elongation Angle of Nodal Roots and Its Possible Relation to Spatial Root Distribution in Maize and Foxtail Millet

Japanese Journal of Crop Science

Tomomi NAKAMOTO¹  Akio MATSUZAKI¹  Kazuo SHIMODA¹ 

关键词: Elongation angle;    アワ;    Nodal root;    傾斜重力屈性;    Plagiogravitropism;    根系;    Root distribution;    根系分布;    Root length density;    根長密度;    Root system;    伸長角度;    Setaria italica Beauv.;    節根;    Zea mays L.;    トウモロコシ;   

DOI  :  10.1626/jcs.60.543

学科分类：农业科学（综合）

来源: Nihon Sakumotsu Gakkai / Crop Science Society of Japan

【 摘 要 】

The elongation direction of nodal roots is a key parameter analyzing the root distribution of cereal crops. Elongation angle, which is represented by degrees of deflection from the vertical (plant axis), was measured on the nodal roots that appeared from each internode of isolated individuals of maize (cv. Gold-dent 1106, cv. Nagano 1) and foxtail millet (cv. Toranoo, cv. Rikuu 8). A greater or lesser elongation angle implies that a nodal root elongates in a more horizontal or vertical derection, respectively. In maize, the elongation angle was less on nodal roots that appeared from upper internodes than on those from lower internodes. In foxtail millet, the elongation angle of nodal roots was conspicuously great on middle internodes. Along the axis of a nodal root, the elongation angle of foxtail millet increased nearest the base and decreased towards the tip. It is clear that the degree of plagiogravitropism of the nodal roots of both maize and foxtail millet varies according to internode number. Some distinct differences were observed between cultivars in root distribution patterns in soil as well as in the elongation angle, that is, the maize and foxtail millet cultivars whose nodal roots had lesser elongation angles developed a vertically orientated root system. The elongation angle of nodal roots is an useful parameter for characterizing the shape of a rooting zone in soil.

【 授权许可】

Unknown