Evaluation of Shattering Habit of the Unhulled Rice Excavated from the Remains in the early Yayoi Period by X-ray CT Measuring

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  • X線CT計測による弥生時代前期出土米の脱粒性の評価
  • Xセン CT ケイソク ニ ヨル ヤヨイ ジダイ ゼンキ シュツド マイ ノ ダツリュウセイ ノ ヒョウカ

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Abstract

The high-resolution X-ray CT measuring was carried out in SPring-8 for the judgment of the shattering habit of unhulled rice in an aggregate of spikelet and part of panicle excavated from the remains in the early Yayoi Period (cal BC480±30). The shattering habit was estimated by analysis of the X-ray CT image of pixel size 25 μm of the base microstructure of unhulled rice in the aggregate. The shattering proportion was 35%. Since the shattering part of the unhulled rice was abscission layer at the base of rachilla, it was suggested in this case that the grade of shattering habit of unhulled rice in the aggregate was equivalent to very easy shattering of current cultivar. The unhulled rice in the aggregate judged as shattering or non-shattering was classified into japonica type instead of indica type with high shattering habit from the spikelet shape (length-to-width ratio). Furthermore, it was shown that the harvesting time of the unhulled rice, whose shattering habit was judged, would be presumed from evaluating the grain filling level of the unhulled rice by the thickness of brown rice latest determined in a growth of spikelet.

Journal

  • Journal of Crop Research

    Journal of Crop Research 61 (0), 27-31, 2016

    The Society of Crop Science and Breeding in Kinki, Japan

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