Root System Formation in Rice Plant : I. Development of lateral roots on the primary roots of the main stem

Japanese Journal of Crop Science

Choji KAWASHIMA¹ 

关键词: Growth;    根系;    Rice plant;    生育;    Root system;    水稲;   

DOI  :  10.1626/jcs.57.8

学科分类：农业科学（综合）

来源: Nihon Sakumotsu Gakkai / Crop Science Society of Japan

【 摘 要 】

The development of lateral roots on the primary roots of the main stem was studied. The lateral roots studied included all kinds of roots, i.e., secondary and tertiary, and the thin and the thick type of the secondary root. Comparisons were made among the different shoot units. The upper and the lower crown roots from the same shoot unit were also compared. Elongation of the secondary as well as of the tertiary roots stopped by the time when the primary root completed its elongation or slightly afterwards. Lateral roots of the seventh to ninth shoot units had the longest final length. Most secondary roots were located at around 6-30 cm from the base of the primary root. In this region of the lower crown roots, the number of the secondary roots was the largest at the seventh to ninth shoot unit. On the upper crown roots, there were more secondary roots at the higher-positioned shoot units. There were more secondary roots per primary root in the eighth or ninth shoot unit. The tertiary roots were more densely developed in the higher-positioned shoot units. The higher-positioned shoot units developed thinner lateral roots.

【 授权许可】

Unknown