Evaluation of Large Vascular Bundle of Panicle Neck Internode of Rice Seed Aggregate and Rice Straw Aggregate Excavated from the Remains by X-ray CT Measuring

Abstract

The X-ray CT Measuring, for the rice seed aggregate excavated from the Daifuku remains and Thung Noi Lam remains and the rice straw aggregate excavated from the Karako-Kagi remains and Dainakanokominami remains, was carried out on the measurement condition of pixel size of 25.1μm and 12.04μm in SPring-8, and the two-dimensional consecutive images with clear microstructure of the panicle axis and the elongated internode of aggregate were obtained. By analyzing these images, the panicle neck node was distinguished from the node of the panicle axis and the elongated internode by the shape of the bract on the node. Based on the shape of the bract of the distinguished panicle neck node and the part which the primary rachis-branch connected to panicle axis, the panicle neck internode to be connected to the bottom end of the panicle neck node was identified. As a result, the number of the large vascular bundle of the panicle neck internode was evaluated using the cross section image of the panicle axis and the elongated internode of rice seed aggregate and rice straw aggregate excavated from the remains.