Abstract
Some experiments were carried out to make clear the relation between the vascular connection of the individual leaves with each other and with the tillers, and the growth of the individual leaves and tillers in rice plant. The results obtained are summarized as follows: 1) It was considered by the writer that the time of emergence of the (N+3)rd leaf was influenced by the activity of the (N) th leaf, being maintained at maximum against the other leaves during the period from the emergence of the (N+2)nd leaf to that of the (N+3)rd leaf and also by the activity of the (N+1)st leaf which is closely connected by vascular strand with (N+3)rd leaf. The ordinal numbers above mentioned mean the position of the leaves or tillers on the main culm, that is, (N)th leaf (tiller) means a certain leaf (tiller), (N+1)st leaf (tiller) is the leaf (tiller) above the (N)th leaf and so on. 2) The growth of the (N+2)nd leaf was correlated with the (N)th one that showed the maximum activity during the development of the former one and was connected by the vascular strand with it. 3) The time of emergence of the 1st and 2nd leaves on the (N)th tiller was affected by the culm leaf showing the highest activity during their growth and by the activity of (N+1)st leaf connected with them. The (N)th leaf had an influence on the emergence of the 1st leaf of (N)th tiller. 4) The growth of the 1st and 2nd leaves on the (N)th tiller was found similar to the result mentioned above
