Development and characterization of a new rice cultivar, ‘Chikushi-kona 85’, derived from a starch-branching enzyme IIb-deficient mutant line

A new super-hard rice cultivar, ‘Chikushi-kona 85’, which was derived from a cross between ‘Fukei 2032’ and ‘EM129’, was developed via bulk method breeding. ‘Chikushi-kona 85’ showed a higher content of resistant starch than the normal non-glutinous rice cultivar, ‘Nishihomare’, and a higher grain y...

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Published in:	Breeding Science Vol. 68; no. 2; pp. 278 - 283
Main Authors:	Wada, Takuya, Yamaguchi, Osamu, Miyazaki, Masayuki, Miyahara, Katsunori, Ishibashi, Masafumi, Aihara, Takeshi, Shibuta, Takanobu, Inoue, Takashi, Tsubone, Masao, Toyosawa, Yoshiko, Satoh, Hikaru, Akaishi, Ryuuichirou, Yoshii, Youichi, Ohtsubo, Ken’ichi
Format:	Journal Article
Language:	English
Published:	Japan Japanese Society of Breeding 01-03-2018 Japan Science and Technology Agency
Subjects:	Amylopectin Breeding control of blood sugar level Cookies Crop yield Deficient mutant Enzymes Genetic analysis Grain Oryza Oryza sativa L resistant starch Rice Starch Starch-branching enzymes Sugar super-hard rice Oryza sativa L control of blood sugar level super-hard rice resistant starch
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Summary:	A new super-hard rice cultivar, ‘Chikushi-kona 85’, which was derived from a cross between ‘Fukei 2032’ and ‘EM129’, was developed via bulk method breeding. ‘Chikushi-kona 85’ showed a higher content of resistant starch than the normal non-glutinous rice cultivar, ‘Nishihomare’, and a higher grain yield than the first super-hard rice cultivar, ‘EM10’. The amylopectin chain length of ‘Chikushi-kona 85’ and its progenitor line ‘EM129’ was longer than that of ‘Nishihomare’, and was similar to that of ‘EM10’. This suggests that the starch property of ‘Chikushi-kona 85’ was inherited from ‘EM129’, which is a mutant line deficient in a starch branching enzyme similar to ‘EM10’. Genetic analysis of ‘Chikushi-kona 85’ crossed with ‘Nishihomare’ also showed that the starch property of ‘Chikushi-kona 85’ was regulated by a single recessive gene. Consumption of processed cookies made from ‘Chikushi-kona 85’ flour showed a distinctive effect in controlling blood sugar levels in comparison to the normal non-glutinous rice cultivar ‘Hinohikari’. These results show that ‘Chikushi-kona 85’ is a novel genetic source to develop new products made of rice, which could reduce calorie intake and contribute to additional health benefits.
Bibliography:	ObjectType-Article-1 SourceType-Scholarly Journals-1 ObjectType-Feature-2 content type line 23 Present address: Faculty of Applied Life Sciences, Niigata University of Pharmacy and Applied Life Sciences, 265-1 Higashijima, Akiha-ku, Niigata 956-8603, Japan Present address: Fukuoka Prefectural Office, 7-7 Higashi-koen, Hakata-ku, Fukuoka 812-8577, Japan Communicated by Hiroshi Kato Present address: Kitakyushu Agricultural Extension Center of Fukuoka Prefecture, 3-7-1 Norimatsu, Yahata-nishi, Kitakyushu, Fukuoka 807-0831, Japan
ISSN:	1344-7610 1347-3735
DOI:	10.1270/jsbbs.17069