著者

Ayumi Agata Motoyuki Ashikari Yutaka Sato Hidemi Kitano Tokunori Hobo

出版者

Japanese Society of Breeding

雑誌

Breeding Science (ISSN:13447610)

巻号頁・発行日

vol.73, no.1, pp.86-94, 2023 (Released:2023-04-15)

参考文献数

34

被引用文献数

1

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Rice panicle architecture displays remarkable diversity in branch number, branch length, and grain arrangement; however, much remains unknown about how such diversity in patterns is generated. Although several genes related to panicle branch number and panicle length have been identified, how panicle branch number and panicle length are coordinately regulated is unclear. Here, we show that panicle length and panicle branch number are independently regulated by the genes Prl5/OsGA20ox4, Pbl6/APO1, and Gn1a/OsCKX2. We produced near-isogenic lines (NILs) in the Koshihikari genetic background harboring the elite alleles for Prl5, regulating panicle rachis length; Pbl6, regulating primary branch length; and Gn1a, regulating panicle branching in various combinations. A pyramiding line carrying Prl5, Pbl6, and Gn1a showed increased panicle length and branching without any trade-off relationship between branch length or number. We successfully produced various arrangement patterns of grains by changing the combination of alleles at these three loci. Improvement of panicle architecture raised yield without associated negative effects on yield-related traits except for panicle number. Three-dimensional (3D) analyses by X-ray computed tomography (CT) of panicles revealed that differences in panicle architecture affect grain filling. Importantly, we determined that Prl5 improves grain filling without affecting grain number.

著者

Kiyoe Ishimoto Misuzu Nosaka-Takahashi Mitsuko Kishi-Kaboshi Tsuneaki Watanabe Kiyomi Abe Sae Shimizu-Sato Hirokazu Takahashi Mikio Nakazono Hirohiko Hirochika Yutaka Sato

出版者

Japanese Society for Plant Biotechnology

雑誌

Plant Biotechnology (ISSN:13424580)

巻号頁・発行日

pp.22.1117a, (Released:2023-01-23)

参考文献数

25

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In plants, mitogen activated protein kinases (MPKs) are involved in various signaling pathways that lead to biotic and abiotic responses as well as that regulate developmental processes. Among them, MPK6 and its closely related homologue, MPK3, act redundantly and are known to be involved in asymmetric cell divisions of meristemoid mother cells in stomata development and of zygotes in Arabidopsis. Loss-of-function mutants of GLE4/OsMPK6, which is an orthologue of MPK6 in rice, showed a defect in polarity establishment in early stage of embryogenesis. However, because of the embryo lethality of the mutations, the function of GLE4/OsMPK6 in post-embryonic development is not clarified. Here, we report the analysis of post embryonic function of GLE4/OsMPK6 in vegetative stage of rice using regenerated gle4/osmpk6 homozygous plants from tissue culture. The regenerated plants are dwarf and produce multiple shoots with small leaves. These shoots never develop into reproductive stage, instead, proliferate vegetative shoots repeatedly. Leaves of gle4/osmpk6 have small leaf blade at the tip and blade-sheath boundary become obscure. Stomata arrangement is also disturbed in gle4/osmpk6 leaf blade. The shape of shoot apical meristem of gle4/osmpk6 become disorganized. Thus, GLE4/OsMPK6 functions in shoot organization and stomata patterning in the post embryonic development in rice.

著者

佐藤 豊 サトウ ユタカ Yutaka Sato

雑誌

ICU 日本語教育研究センター紀要 = The Research Center for Japanese Language Education Annual Bulletin

巻号頁・発行日

no.10, pp.1-12, 2001-03-31

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This paper summarizes the reviews of Japanese language textbooks for intermediate-level learners. Articles written on this subject, that is, Japanese language textbooks for intermediate-level learners, were collected as part of the on-going project to develop an intermediate-level textbook for learners of Japanese in the Japanese Language Programs, International Christian University. The following aspects of textbook development have been discussed and briefly summarized in this paper: (i) what skills should be emphasized (reading/writing or speaking/listening?), (ii) what kinds of topics are good as reading materials for learners of Japanese, (iii) how are grammatical points incorporated into readings in textbooks on the market, and (iv) what kinds of exercises and activities are there in those textbooks. Finally, an attempt to classify the textbooks into three types, the traditional type, the "new" type and the "geared-to-specific-skills" type, is introduced.

著者

Yutaka Sato Katsutoshi Tsuda Yoshiyuki Yamagata Hiroaki Matsusaka Hiromi Kajiya-Kanegae Yuri Yoshida Ayumi Agata Kim Nhung Ta Sae Shimizu-Sato Toshiya Suzuki Misuzu Nosaka-Takahashi Takahiko Kubo Shoko Kawamoto Ken-Ichi Nonomura Hideshi Yasui Toshihiro Kumamaru

出版者

Japanese Society of Breeding

雑誌

Breeding Science (ISSN:13447610)

巻号頁・発行日

vol.71, no.3, pp.291-298, 2021 (Released:2021-07-30)

参考文献数

62

被引用文献数

5

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Biological resources are the basic infrastructure of bioscience research. Rice (Oryza sativa L.) is a good experimental model for research in cereal crops and monocots and includes important genetic materials used in breeding. The availability of genetic materials, including mutants, is important for rice research. In addition, Oryza species are attractive to researchers for both finding useful genes for breeding and for understanding the mechanism of genome evolution that enables wild plants to adapt to their own habitats. NBRP-RICE contributes to rice research by promoting the usage of genetic materials, especially wild Oryza accessions and mutant lines. Our activity includes collection, preservation and distribution of those materials and the provision of basic information on them, such as morphological and physiological traits and genomic information. In this review paper, we introduce the activities of NBRP-RICE and our database, Oryzabase, which facilitates the access to NBRP-RICE resources and their genomic sequences as well as the current situation of wild Oryza genome sequencing efforts by NBRP-RICE and other institutes.

著者

Yutaka Sato Katsutoshi Tsuda Yoshiyuki Yamagata Hiroaki Matsusaka Hiromi Kajiya-Kanegae Yuri Yoshida Ayumi Agata Kim Nhung Ta Sae Shimizu-Sato Toshiya Suzuki Misuzu Nosaka-Takahashi Takahiko Kubo Shoko Kawamoto Ken-Ichi Nonomura Hideshi Yasui Toshihiro Kumamaru

出版者

Japanese Society of Breeding

雑誌

Breeding Science (ISSN:13447610)

巻号頁・発行日

pp.21005, (Released:2021-06-26)

被引用文献数

5

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Biological resources are the basic infrastructure of bioscience research. Rice (Oryza sativa L.) is a good experimental model for research in cereal crops and monocots and includes important genetic materials used in breeding. The availability of genetic materials, including mutants, is important for rice research. In addition, Oryza species are attractive to researchers for both finding useful genes for breeding and for understanding the mechanism of genome evolution that enables wild plants to adapt to their own habitats. NBRP-RICE contributes to rice research by promoting the usage of genetic materials, especially wild Oryza accessions and mutant lines. Our activity includes collection, preservation and distribution of those materials and the provision of basic information on them, such as morphological and physiological traits and genomic information. In this review paper, we introduce the activities of NBRP-RICE and our database, Oryzabase, which facilitates the access to NBRP-RICE resources and their genomic sequences as well as the current situation of wild Oryza genome sequencing efforts by NBRP-RICE and other institutes.

著者

Ko Sakai Yutaka Sato

雑誌

情報処理学会論文誌 (ISSN:18827764)

巻号頁・発行日

vol.59, no.4, 2018-04-15

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In this paper we propose a method for constructing a Gray map for a group. In an earlier paper, we suggested a new design principle of Gray maps for groups and tried to apply it to several concrete groups. Though the trial had some success, the method is not very constructive. In this paper we try to design a more constructive method based on the semidirect-product structure of the target group.------------------------------This is a preprint of an article intended for publication Journal ofInformation Processing(JIP). This preprint should not be cited. Thisarticle should be cited as: Journal of Information Processing Vol.26(2018) (online)DOI http://dx.doi.org/10.2197/ipsjjip.26.345------------------------------