Studies on Large Vascular Bundles in Paddy Rice Plant and Panicle Formation : III. Relationships between the changes in number of Lage vascular bundles in the tillers and the panicle formation

Abstract

1. The number of large vascular bundles in the first (highest) and second elongated internodes was almost invariable throughout each group of the main culms, the primary, the secondary, and the tertiary tillers. The so-called "the same rank-the same number" principle was applicable. The number of large vascular bundles in the first elongated internode varied according to the tiller tank. The number on the main culm was largest, followed in order by the primary tiller, the secondary tiller, and the tertiary tiller. The number decreased at the rate of one in order named. 2. The number of large vascular bundles in the blades of five high-ranking leaves on the main culm as well as on the tillers was almost invariable throughout the leaves of every rank. The so-called "the same rank-the same number" principle was applicable. The number of large vascular bundles in the flag leaf varied according to the tiller rank. The number on the main culm was largest, followed in order by the primary tiller, the secondary tiller, and the tertiary tiller. The number decreased at the rate of one in order named. 3. Throughout the main culm, the primary tiller, the secondary tiller, and the tertiary tiller, there was an increasing tendency in the number of large vascular bundles in the flag leaf on such culm which possessed a lot of large vascular bundles in the first and second elongated internodes.