Tillering Behavior in Oryza sativa L. : VII. Relation between tiller age and panicle formation in the individual tillers

[摘要] The relation between tiller age 'Yourei' and panicle growth stage (PS) in each tiller was investigated. Yourei is a scale of plant age expressed by leaf number. The first decimal place indicates the ratio of the length of the emerged part of the expanding leaf blade to its expected final length. Plants (cv. Sasanishiki, 3 plants/pot) were sampled at the panicle formation stage and observed under a dissecting microscope. For analysis we used the complementary age-scale Ho-Yourei (cA) which counted backwards from the flag leaf that just expanded (cA=LN-A, where LN is the total number of leaf on the tiller and A is Yourei). Panicle formation stage (from the differentiating stage of the flag leaf primordia to the late differentiating stage of flower primordia) was divided into 12 stages (pS 1∼pS l2). Variances of PS or cA in individual plants increased with time. The relationship between PS (y-axis) and cA (x-axis) is represented by the equation y=15.95-3.74x. In each tiller (LN=4 to 15), when half of the fourth leaf blade (counted from the flag leaf) expanded (cA 3.3∼3.6), the tiller began to initiate its panicle (PS 3: the increasing stage of bract primordia).

[学科分类] 农业科学（综合）

[关键词] Growth analysis Panicle formation;生殖生長;Panicle growth stage;生長解析;Panicle initiation;補葉齢;Reproductive stage;幼穂発育ステージ;Tiller age;幼穂分化;葉齢;葉齢指数