Journal of Crop Research
Online ISSN : 2424-1318
Print ISSN : 1882-885X
ISSN-L : 1882-885X
Research Article
Morphology of the unhulled rice contained in the rice seed aggregate of the Yayoi period excavated from the remains in Nara, Tottori, and Tokyo
Tatsuya InamuraAyumu KinuhataKenichi Okada
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JOURNAL OPEN ACCESS

2021 Volume 66 Pages 13-19

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Abstract

The X-ray CT measuring was carried out in SPring-8 for the judgment of the morphology of the unhulled rice contained in the 12 rice seed aggregates of the early, middle and latter of Yayoi period excavated from the five remains in Nara Prefecture, Tottori Prefecture, and Tokyo. From the analysis of the X-rays CT image, the 12 rice seed aggregates excavated included the spikelet and part of panicle, and the unhulled rice in the 12 aggregates were classified into the temperate japonica type. In many cases, the grain shape of unhulled rice in the aggregates differed among 12 aggregates. The length and width of unhulled rice in the 12 aggregates showed the normal distribution with small variation width as those of modern cultivar. Based on the above-mentioned results, the unhulled rice in each aggregates might originate from single rice variety of the temperate japonica type having different grain shape. The width of unhulled rice in the aggregates of Aoyakamijichi remain were bigger, and these aggregates were classified into the smaller type of length/width ratio as compared with other aggregates.

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© 2021 The Society of Crop Science and Breeding in Kinki, Japan
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