Hardness Distribution and Endosperm Structure on Polishing Characteristics of Brewer's Rice Kernels(Crop Morphology)
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概要
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This study was designed to determine the effects of the hardness distribution and the endosperm structure on the polishing characteristics of brewer's rice kernels. We used four brewer's rice cultivars, Kairyro-omachi, Hattan-nishiki No. 1, Senbon-nishiki and Yamada-nishiki. The broken kernel ratios in Kairyo-omachi and Hattan-nishiki No. 1 were significantly higher than those in Senbon-nishiki and Yamada-nishiki. Vickers hardness (VH) values in white-core tissues in kernels differed among varieties, which were significantly lower in Kairyo-omachi and Hattan-nishiki No. 1. However, no varietal differences were observed in VH values in the peripheral translucent tissues surrounding the white-core tissues. The tissues along the dorsoventral axis were softer than those along the longitudinal axis of the kernels. The tissues on the ventral side were softer than those on the dorsal side. Scanning electron microscopy (SEM) observations revealed the presence of closely arranged compound starch granules and few varietal differences in the peripheral translucent tissues surrounding the white-core tissues. However, as compared with Yamada-nishiki and Senbon-nishiki, in Hattan-nishiki No. 1 and Kairyo-omachi, the starch granules were loosely packed and the airspaces between the starch granules were more numerous in the white-core tissues. A higher number of airspaces and less starch were present in the endosperm cells along the dorsoventral axis when compared with along the longitudinal axis and on the ventral side than .on the dorsal side. The present study showed that polishing characteristics are closely related with the endosperm structure, which is characterized as the density of starch granules.
著者
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Tsuchiya Takao
Hiroshima Agricultural Extension Center
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Tamaki Masahiko
Faculty Of Agriculture Meiji University
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Tamaki Masahiko
Fac. Of Agriculture Meiji Univ.
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Kurita Shingo
School of Bioresources, Hiroshima Prefectural University
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Toyomaru Miyuki
School of Bioresources, Hiroshima Prefectural University
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Kurita Shingo
School Of Bioresources Hiroshima Prefectural University
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Toyomaru Miyuki
School Of Bioresources Hiroshima Prefectural University
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