麦類における葉・分けつの伸長方向と葉の左右性

抄録

1. The line of phyllotaxis in main stem was as a rule parallel with the line of long dimension of grain, and the odd number's leaves grew on the opposite side of scutellum and the even number's leaves grew on thc side of scutellum. 2. When the third or fourth foliage leaves emerge, main stem begins to incline to right or left direction against the line of long dimension of grain, at the same time primary branch leaf arises on the opposite side. The divergence among main stem, first primary branch and second one was about 120 degrees each other. 3. When seeds were sown with embryos upward and on this side, the ratio numbers of plant in which primary branch developed the right side (type A) to those on the left side (type B) was nearly 1 : 1. 4. The ratio right handed plant to left ones in al1 leaves of main stem and branches was almost 1 : 1 too. Frequency of alternation of right handedness and left handedness was very high in the case of third or more upper leaves of main stem and branches. 5. The above mentioned tillering type A and B has a connection with right and left handedness of leaves in main stem. The plant which has a right-handed third and upper odd number's leaves forms type A, and left-handed one forms type B.