Morphological Studies on the Regularity of Shoot Development in Rice Plants : VI. The regular relationship between leaf primordia developments in the main shoot and primary tiller buds

[摘要] Rice cv. Koshihikari was seeded and grown for three years. Seedlings were dissected under a stereoscopic microscope for anatomical studies at the following stages; in n.1 age when the (n+1)-th lamina of the main shoot emerges from the n-th leaf sheath of the same main shoot, and in the middle of n.1 age and (n+1). 1 age through the vegetative phase. Appearance of a protuberance at the peripheral zone of the shoot apex was used as the sign of differentiation of a leaf primordium. Through 1.1 age to 10.1 age, the main shoot of the plant at n.1 age developed at the axil of its (n+1) leaf a hemisphere primordium which evolves into a primary tiller bud. This relationship was true for the development of the 2nd to 9th primary tiller buds. During the phyllochron (leaf emergence interval) of the (n+1) leaf, two leaf primordia for the prophyll and the 1st leaf were formed on the above tiller apex. During the three successive phyllochrons, the number of leaf primordia formed on the tiller apex was two, one and two, respectively. When the above last leaf primordium corresponding to the 6th leaf of the tiller differentiates in the third phyllochrons, the 2nd lamina of the tiller starts to emerge from its 1st leaf sheath. Generally, the 2nd to 9th tiller buds evolved into tillers.

[学科分类] 农业科学（综合）

[关键词] Anatomy;イネ;Differentiation;形態形成;Leaf primordium;発育解剖;Oryza sativa L.;発育形態;Plastochron;分化;Rice plant;分げつ;Shoot apex;分げつ芽;Tiller;葉原茎