Tillering Behavior in Oryza sativa L. : VI. The tillering behavior at late tillering stage

[摘要] The tillering behavior of rice plants (1 plant/pot) at the late tillering stage was investigated. Assuming plant growth in which a leaf of each tiller and a leaf of the main stem expand synchronously (synchronous growth), we made a growth curve of tiller number which we called a 'synchronous growth curve (SGC). Compared the SGC with the growth curve (tiller number) obtained from actual measurement (MGC), we analyzed the pattern of tillering cessation. The growth curve of increase in tiller number of cv. Sasanishiki (which SGC was simple sigmoid curve) and the simulated growth curve (which was drawn under the assumption that every tiller had appeared) were used for the analysis. Though the tiller number of MGC suddenly stopped increasing and the relative rate of the increase in tiller number (Rt) of MGC fell off sharply, Rt of SGC decreased gradually. We thought that the factor responsible for the phenomenon was the difference (D) in growth speed between the main stem and each tiller. In relation to tillering cessation, we examined tiller positions or the last emergence daughter tillers (LMT: the tiller which emerged last from each mother tiller) and the emergence date of LMT. We also discussed the application of the concept of Rt to the analysis of the tillering at the last tillering stage.

[学科分类] 农业科学（综合）

[关键词] Growth analysis;茎数増加曲線;Last emergence daughter tiller;最終分げつ;Relative rate;生長解析;Synchronous growth;相対分げつ位;Tiller;相対分げつ増加率;Tiller number;相対葉齢差;Tiller position;同周期生長;Tillering;分げつ