水稲における通気組織と通気組織系に関する解剖学的ならびに生態学的研究

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The ventilating pressure is valuable for estimation of a degree of the development of the ventilatingsystem which affords a pass-way for internal oxygen transport frorn the shoot to the roots.In rice plants, the aerenchyma contributive to oxygen transport is formed by cell division of theaerenchyma cambium at one unit higher than that having the uppermost unfolded leaf.As soon as the aerenchyma has been formed, root primordia begin to initiate in corporation withthe connecting vascular bundles diverged from the reinforced vascular bundes by cell division of the re-sidual meristem. The leaf-internode unit contains both the node and the internode. The node is a part where thereinforced vascular bundles are divided into many compartments by the presence of air canals. Theupper roots are produced here. On the contary the internode is a part where the reinforced vascularbundles remain completely circular in form and no vascular bundles can be seen in the aerenchyma.The lower roots are produced here. The form of the reinforced vascular bundles at the middle of the internode is classified into seventypes. In all unelongated internodes the form corresponds to type 1, and those of elongated inter-nodes vary with the position of the internode. The uppermost one belongs to type 7. It must bestressed that types of the form ranging from forms I to 3 are found without fail at the basal part of allelongated internodes, extending over about 2 - 3 mm above the node along the vertical axis. An axil-lary bud departs from here.
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水稲における通気組織と通気組織系に関する解剖学的ならびに生態学的研究

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